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Gravity
Terms in this set (93)
A box of mass m is placed on an incline with angle of inclination 30 degrees. The box does not slide. The magnitude of the frictional force in this case is:
mg sin 30
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the balls speed at a minimum? (air resistance is negligible)
at the top of the trajectory
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of acceleration at a minimum?
acceleration is constant during the entire trajectory
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the vertical component of velocity have its maximum value?
Just after leaving the center fielders hand
Two equal forces act on two different objects, one of which has a mass ten times as large as the other. Will the more massive object have a larger acceleration, an equal acceleration, or a smaller acceleration than the less massive object?
The larger mass has a smaller acceleration since the ratio of accelerations will be the inverse ratios of the masses.
A 3-kg block is observed to accelerate at a rate twice that of a 6-kg block. Is the net force acting on the 3-kg block twice as large as that acting on the 6-kg block?
No, the forces on the blocks are equal since half the mass times twice the acceleration yields the same force
An object moving horizontally across a table is observed to slow down. Is there a non-zero net force acting on the object?
?
A car goes around a curve traveling at constant speed.
Is the acceleration of the car zero in this process?
No, the velocity of the car is continuously changing direction while on the curve so there is acceleration.
A car goes around a curve traveling at constant speed.
Is there a non-zero net force acting on the car in this case?
Yes, a non-zero net force is required to produce an acceleration.
Is the mass of an object the same thing as its weight?
No, mass is an intrinsic property of matter, while weight is a force resulting from an object under the influence of Earth's gravitational field.
The gravitational force acting on a lead ball is much larger than that acting on a wooden ball of the same size. When both are dropped, does the lead ball accelerate at the same rate as the wooden ball?
Yes, they both accelerate at the same rate but the forces are different because their masses are different.
Is mass a force?
No, mass is not a force but a property of matter arising from the structure of matter.
Two identical cans, one filled with lead shot and the other with feathers, are dropped from the same height by a student standing on a chair.
Which can, if either, experiences the greater force due to the gravitational attraction of the Earth?
The lead shot-filled can experiences a greater force due to gravity because it contains more mass.
Two identical cans, one filled with lead shot and the other with feathers, are dropped from the same height by a student standing on a chair.
Which can, if either, experiences the greater acceleration due to gravity?
Both cans experience the same acceleration due to gravity regardless of mass.
An elevator weighing 20,000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 2.00 m/s2? (g = 9.80 m/s2)
24,100 N
As a 3.0-kg bucket is being lowered into a 10-m deep well, starting from the top, the tension in the rope is 19.6 N. The acceleration of the bucket will be:
3.3 m/s2 downward.
Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2. What is the magnitude of the force exerted on the right cube by the middle cube in this case?
18 N
A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200. A string attached to the block is pulled horizontally, resulting in a 3.00 m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2)
24.8 N
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless, horizontal surface. A second string, attached only to the 6.0-kg block, has horizontal force = 45 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks.
27 N
A 100-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 25°. What is the coefficient of static friction between box and ramp?
0.47
Two ropes are attached to a 40-kg object. The first rope applies a force of 50 N and the second, 40 N. If the two ropes are perpendicular to each other, what is the resultant magnitude of the acceleration of the object?
1.6 m/s2
A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration?
2.4 m/s2
A 10-kg mass and a 6.0-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/s2, what is the acceleration of the system when released?
2.5 m/s2
As a car goes up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to:
the normal force of the road times the coefficient of static friction.
Which of the following is an example of the type of force that acts at a distance?
a.gravitational
b.magnetic
c.electrical
d. all of the above
d. all of the above
If we know an object is moving at constant velocity, we may assume:
a.
the net force acting on the object is zero.
b.
there are no forces acting on the object.
c.
the object is accelerating.
d.
the object is losing mas
a. the net force acting on the object is zero.
Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated
into Newton's laws of motion?
a.
An object's acceleration is inversely proportional to its mass.
b.
For every action there is an equal b
ut opposite reaction.
c.
The natural condition for a moving object is to remain in motion.
d.
The natural condition for a moving object is to come to rest
c. The natural condition for a moving object is to remain in motion.
What condition must apply to a system's state of motion for it to be regarded as an inertial frame of reference?
a.
in decreasing velocity
b.
in constant velocity
c.
in constant acceleration
d.
in increasing acceleratio
b. in constant velocity
A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration?
0.71 m/s
F=MA
A=F/M
An astronaut applies a force of 500 N to an asteroid, and it accelerates at 7.00 m/s. What is the asteroid's
mass?
71 kg
M=FA
Two ropes are attached to a 40-kg object. The first rope applies a force of 25 N and the second, 40 N. If the two ropes are perpendicular to each other, what is the resultant acceleration of the object?
1.2m/s
Two forces act on a 6.00-kg object. One of the forces is 10.0 N. If the object accelerates at 2.00 m/s what is the greatest possible magnitude of the other force?
22N
The acceleration due to gravity on the Moon's surface is one
sixth that on Earth. An astronaut's life support backpack weighs 300lb on Earth. What does it weigh on the Moon?
50lb
The acceleration due to gravity on the Moon's surface is one
sixth that on Earth. What net force would be required to accelerate a 20kg object at 6.0 m/s on the moon?
120N
If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:
a.
at rest.
b.
moving with a constant velocity.
c.
being accelerated.
d.
losing mass
b. moving with a constant velocity.
A cart of weight 20 N is accelerated across a level surface at 0.15 m/s What net force acts on the wagon?
.31N
Rita accelerates a 0.40 kg ball from rest to 9.0 m/s during the 0.15 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?
24N
A barefoot field goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.50kg and time of contact with the football is 0.025 s, what is the force exerted on the foot?
600N
An automobile of mass 2 000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10 000N. How far does the car travel before stopping?
90M
A baseball batter hits an incoming 40m/s fastball. The ball leaves the bat at 50 m/s after a ball on-bat contact time of 0.030 s. What is the force exerted on the 0.15kg baseball
450N
A shot putter moves his arm and the 7.0kg shot through a distance of 1.0 m, giving the shot a velocity of 10m/s from rest. Find the average force exerted on the shot during this time
350N
In the terminology a 500-N block, the the 500-N Refers to the block's
weight
The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?
Third
A thrown stone hits a window, but doesn't break it. Instead it reverses direction and ends up on the ground
below the window. In this case, we know
the force of the stone on the glass = the force of the glass on the stone
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless horizontal surface. A 2nd string, attached only to the 9-kg block, has horizontal force 30 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks.
12N
An airplane of mass 1.2 104 kg tows a glider of mass 0.6 104 kg. The airplane propellers provide a net forward thrust of 3.6 104 N. What is the glider's acceleration?
2.0m/s
Two blocks of masses 20 kg and 8 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8-kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.50 m/s2 what is the tension in the connecting string between the blocks?
10N
A 10-kg mass and a 2.0-kg mass are connected by a light string over a massless, frictionless pulley. If g 9.8 m/s2 , what is the acceleration of the system when released?
6.5m/s
A 15-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2 , what is the tension in the connecting string?
37N
An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2 ? (g 9.80 m/s2 )
26100N
As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is:
a. bigger than his weight.
As I slide a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
d. less than the weight of the box.
Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 2.0 m/s2 . What is the magnitude of the force exerted on the middle cube by the left cube in this case?
24N
Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 2.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?
12N
A sled weighs 100 N. It is held in place on a frictionless 20 slope by a rope attached to a stake at the top; the rope is parallel to the slope. Find the tension in the rope.
34N
A sled weighs 100 N. It is held in place on a frictionless 20 slope by a rope attached to a stake at the top; the rope is parallel to the slope. What is the normal force of the slope acting on the sled?
94N
A 20-kg traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
4900N
A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200. A string attached to the block is pulled horizontally, resulting in a 2.00-m/s2 acceleration by the block. Find the tension in the string. (g 9.80 m/s2 )
19.8
A 100-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15. What is the coefficient of static friction between box and ramp?
.27
Doug hits a hockey puck, giving it an initial velocity of 6.0 m/s. If the coefficient of kinetic friction between ice and puck is 0.050, how far will the puck slide before stopping
37m
It is late and Carlos is sliding down a rope from his third floor window to meet his friend Juan. As he slides down the rope faster and faster, he becomes frightened and grabs harder on the rope, increasing the tension in the rope. As soon as the upward tension in the rope becomes equal to his weight:
c. Carlos will continue down at a constant velocity.
As a car moves forward on a level road at constant velocity, the net force acting on the tires is:
zero
As a car skids with its wheels locked trying to stop on a road covered with ice and snow, the force of friction between the icy road and the tires will usually be:
less than the normal force of the road times the coefficient of static friction.
A 10.0-kg mass is placed on a 25.0o incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. What is the frictional force in this situation?
41.4
A 10.0-kg mass is placed on a 25.0o incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. The mass is given a shove causing it to slide down the incline. What is the frictional force while the mass is sliding?
46.2N
A hockey puck moving at 7.0 m/s coasts to a halt in 75 m on a smooth ice surface. What is the coefficient of friction between the ice and the puck?
.033
A 9.0-kg hanging weight is connected by a string over a pulley to a 5.0-kg block sliding on a flat table. If the coefficient of sliding friction is 0.20, find the tension in the string.
38N
A 100-N block, on a 30 incline, is being held motionless by friction. The coefficient of static friction between the block and the plane is 0.60. The force due to friction is:
50N
On a two-lane highway (not divided), a car headed north experiences a centripetal acceleration directed toward the west. Simultaneously, a truck passes the car, headed south in the other lane. The direction of the centripetal acceleration on the truck is
west
If a ball at the end of a string is whirled in a vertical circle at constant speed, the tension will be
greatest at the lowest point in the motion
Car A travels with speed v around curve number one, which has a radius r. Car B travels with speed 2v around curve number two, which has a radius 2r. The acceleration will be
greater for car B.
A ball is whirled on the end of a string in a horizontal circle at constant speed. Suddenly, the string breaks. Immediately after the string breaks, the ball will
have a horizontal velocity that is tangential to the circle.
A car travels around a curve with constant speed. The correct statement from the following is
the car has an acceleration directed inward toward the center of the curve.
A man weighs 650 N while on the surface of Earth. If he is transported to the planet Mythos, which has the same mass as Earth but a radius that is five times larger than Earth's, his weight would be
26N
A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is 40 m. The centripetal acceleration of the cyclist is
10 m/s2, toward the center of the track
Six identical blocks of steel, each with mass 10.0 kg, are taken to the Moon. On the Moon, their combined mass is
60.0 kg
A banked curve in a roadway is designed for a speed of 35 mph. During an ice storm cars should be able to safely negotiate this curve at 35 mph, because at this speed
the necessary centripetal force is supplied entirely by the normal force from the road.
An object undergoes uniform circular motion. Which pair of vectors is perpendicular?
b. Its centripetal acceleration and velocity vectors
An object weighs 30 newtons on Earth. What is its approximate mass?
3kg
For reasons known only to them, a group of extraterrestrials offers you your choice of three gold ingots. One weighs 10 lb on Earth, the second weighs 10 lb on Jupiter, and the third weighs 10 lb on the Moon. To get the most gold, you should choose the ingot that weighs 10 lb on
moon
Earth's gravity attracts a person with a force of 120 lbs. The force with which the Earth is attracted towards the person is
120lbs
A car travels around a curve with constant speed.
Does the velocity of the car change in this process?
Yes, the velocity of a body moving in a curve is continuously changing because of the change in direction.
A car travels around a curve with constant speed.
Is the car accelerated?
Yes, because the velocity of the car is changing.
The acceleration of gravity at the surface of the moon is approximately 1/6 that at the surface of the Earth (9.8 m/s2). What is the weight of an astronaut standing on the moon whose weight on Earth is 170 lb?
28.3 lb
A car travels the same distance at constant speed around two curves, one with twice the radius of curvature of the other. For which of these curves is the change in velocity of the car greater?
The change in velocity is greater for the curve with the smaller radius since the rate of change in the angular direction is greater.
Two masses are attracted by a gravitational force of 0.15 N. What will the force of attraction be if the distance between the two masses is tripled?
0.0167 N
A ball traveling in a circle with a constant speed of 2 m/s has a centripetal acceleration of 6 m/s2. What is the radius of the circle?
0.667 m
If a ball is whirled in a vertical circle with constant speed, at what point in the circle, if any, is the tension in the string the greatest?
The tension is greatest at the lowest point in the circle when it is equal to the sum of the weight plus the mass times acceleration.
During what phase of the moon can a solar eclipse occur?
new moon
Does the sun exert a larger force on the Earth than that exerted on the sun by the Earth?
No, the interaction of two masses results in equal but oppositely directed forces
Two masses are separated by a distance r. If this distance is doubled, is the force of interaction between the two masses doubled, halved, or changed by some other amount?
Doubling the distance between them will result in 1/4 of the original force acting between them.
A ball is traveling at a constant speed of 2 m/s in a circle with a radius of 0.4 m. What is the magnitude of the centripetal acceleration of the ball?
10 m/s2
Is there a net force acting on the planet Earth?
Yes, there is a net gravitational force acting on the Earth, exerted by the sun, the moon, and the more distant heavenly bodies.
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