AP Physics Fall Final

68. The graph shows the force exerted on a block as a function of the block's displacement in the direction of the force. How much work did the force do in displacing the block 5 m?

20 J

If a net force of 10 N acts on a 6 kg mass for 8 seconds, the total change of momentum of the mass is

80 kg m/s

35. Two forces act on the 2 kg box shown below. A 4 N force acts to the right and a 6 N force acts to the left. What is the net force acting on the box?

2 N to the left

An object with a speed of 20 m/s has a kinetic energy of 400 joules. The mass of the object is

2 kg

9. The uniform motion of a cart is shown in the distance versus time graph. What is the average speed of the cart?

2 m/s

81. The diagram shown represents two objects at rest on a frictionless horizontal surface with a spring compressed between them. When the compressed spring is released, the two objects are pushed apart. What is the total momentum of the two object system that is shown after the expansion of the spring?

0 kg m/s

2. What is the magnitude of the object's total displacement after 8.0 seconds?

0 m

5. A ball is thrown horizontally with an initial velocity of 20 meters per second from the top of a tower 60 meters high. What is the initial vertical velocity of the ball?

0 m/s

The mass of 60 paper clips is 18 grams. What is the mass of one paper clip?

0.3 g

The mass of 100 paper clips is measured at 52.3 grams. The mass of a single paper clip from this group would be closest to

0.523 g

The length of a string is 85 centimeters. Expressed in meters, this length is

0.85 m

19. Four arrows are shot horizontally from the top of a tower, as shown below. Which path represents the arrows with the greatest horizontal velocity?

1

A 25 kg mass travels east with a constant velocity of 40 m/s. The momentum of this mass is

1.0 * 10³ kg m/s east

33. A 50 kg child on a skateboard experiences a 75 N force as shown. What is the expected acceleration of the child?

1.50 m/s²

What is the momentum of a 1200 kg car traveling at 15 m/s due east?

1.8 * 10⁴ kg m/s due east

An object falls freely from rest for three seconds. The acceleration of the object is

10 m/s²

A 20 kg object strikes the ground with 1960 holes of kinetic energy after falling freely from rest. How far above the ground was the object when it was released?

10,

A 400 newton girl standing on a dock exerts a force of 100 newtons on a 10000 newton sailboat as she pushes it away from the dock. How much force does the sailboat exert on the girl?

100 N

A reasonable height for a chalk tray above the floor is closest to

100 centimeters

A 100 kg person acquires a velocity of 15 meters per second down a ski slope. What is the skier's kinetic energy?

11250 joules

When a 12 newton horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of static friction acting on the box is

12 N

A student rides a bicycle up a 30 degree hill at a constant speed of 6 m/s. The combined mass of the student and bicycle is 70 kg. What is the kinetic energy of the student-bicycle system during this ride?

1200 J

An object with a mass of 10 kg is moving at a speed of 5 m/s. The kinetic energy of the mass is

125 joules

A net force of 5 N moves a 2 kg object a distance of 3 m in 3 s. How much work is done on the object?

15 J

How much work is done on a 300 N suitcase to lift is 0.5 m?

150 J

96. The diagram shown represents a rectangle composed of squares with sides on meter long. What is the area of the rectangle?

18 m²

22. The accompanying diagram shows a child pulling a 50 kilogram friend on a sled by applying a 300 newton force on the sled rope at an angle of 40 degrees with the horizontal. The vertical component of the 300 newton force is approximately

190 N

A spring has a spring constant of 120 newtons per meter. How much potential energy is sorted in the spring as it is stretched 0.2 meter?

2.4 J

Which of the following objects has the greatest momentum? A. 1 kg object moving at 200 m/sec B. 10 kg object moving at 20 m/sec C. 20 kg object moving at 20 m/sec D. 100 kg object moving at 2 m/sec

20 kg object moving at 20 m/sec

A car travels 300 meters in 15 seconds. What is the average velocity of the car?

20 m/s

A football player kicks a ball with an initial velocity of 25 meters per second at an angle of 53 degrees above the horizontal. The vertical component of the initial velocity of the ball is

20 m/s

57. The diagram shown represents a frictionless track. A 10 kg block starts from rest at point A and slides along the track. What is the approximate potential energy of the block and point C?

200 J

How much work is required to lift a 2 kg mass to a height of 10 m?

200 J

A 60 kg student running at 3 m/s has a kinetic energy of

270 J

The momentum of a 5 kg object moving at 6 m/s is

30 kg-m/sec

A spring of negligible mass with a spring constant of 200 N/m is stretched 0.2 m. How much potential energy is stored in the spring?

4 J

A lab cart with a mass of 5 kg rolls through a distance of 2 meters in 10 seconds. What mathematical statement can be used to determine the momentum?

5 kg * 2 m/10 sec

78. In the diagram shown, a 10 kg ball is fired with a velocity of 500 m/s from a 1000 kg cannon. What is the recoil velocity of the cannon?

5 m/s

32. Two students are pushing a cart, as shown below. The cart will move as if it were acted on by a single force with a magnitude of

50 N

A 50 newton horizontal force is needed to keep an object weighing 500 newtons moving at a constant velocity of 2 meters per second across a horizontal surface. The magnitude of the frictional force acting on the object is

50 N

A soccer player kicks a 0.5 kg stationary ball with a force of 50 N. What is the force on the player's foot?

50 N

When a 5 kg mass is lifted from the ground to a height of 10 m, the gravitations potential energy of the mass is increased by approximately

500 J

When a spring is stretched 0.2 m from its equilibrium, position, it possesses a potential energy of 10 joules. What is the spring constant for this spring?

500 N/m

A garden tractor drags a plow with a force of 500 N a distance of 10 meters in 20 seconds. How much work is done?

5000 J

What force is required to do 60 J of work in sliding an object a distance of 10 m across a level floor?

6 N

67. A 20 N block is at rest at the bottom of a frictionless incline as shown in the diagram,. How much work must be done against gravity to move the block to the top of the incline?

60 J

Which is the most likely mass of a high school student?

60 kg

87. The accompanying velocity-time graph represents the motion of a 3 kg cart along a straight line. The cart starts at t = 0 and initially moves north. What is the magnitude of the change in momentum of the cart between t = 0 and t = 3 seconds?

60 kg m/s

71. The diagram here shows a 1 kg aluminum sphere and a 3 kg copper sphere of equal radius located 20 m above the ground. Just before striking the ground, the speed of the copper sphere is 20 m/s. What is the momentum of the copper sphere?

60 kg-m/sec

What is the average velocity of a car that travels 30 kilometers due west in 0.50 hours?

60 km/hr west

If 10 cubic centimeters of a liquid has a mass of 70 grams, what is its density?

7 g/cm³

A constant for ce of 2 N is used to push a 3 kg mass 4 m across the floor. How much work is done on the mass?

8 J

How much work is done when a rock weighing 10 N is lifted a vertical distance of 8 m?

80 J

6. Which pair of graph represents the same motion of an object?

A

3. Which pair of graphs represent the same motion?

A.

37. 338. The diagram below shows a 5 kg block at rest on a horizontal, frictionless table. Which diagram best represents the force exerted on the block by the table?

A. 49.1

A different force is applied to each of four 1 kg blocks to slide them across a uniform steel surface at constant speed as shown below. In which diagram is the coefficient of friction between the block and steel smallest?

B

14. Which pair of graphs represent the same motion?

C

36. A hot air balloon exerts a force of 1200 N while lifting a load of 800 N. Which free-body force diagram depicts the forces involved?

C

43. A 75 kg boy initially at rest skis down the slope as shown. Assuming no frictional loss, what will be his kinetic energy at the bottom of the slope?

C

8. A steel ball is dropped from a height of 100 meters. Which velocity-time graph best describes the motion of the ball?

C

In which situation is the net force on the object equal to zero? A. a satellite moving at a constant speed around Earth in a circular orbit B. an automobile braking to a stop C. a bicycle moving at constant speed on a straight, level road D. a pitched baseball being hit by a bat

C

15. The accompanying diagram represents the relationship between velocity and time of travel for four cars, A, B, C, and D, in straight-line motion. Which car has the greatest acceleration during the time interval 10 seconds to 15 seconds?

D

20. The graph below shows the distance a student walks down a hall over time. Use the information shown on the graph to answer the following question(s). During which time interval was the student moving the fastest?

D

30. The diagram below represents a block at rest on an incline. Which diagram best represents the forces acting on the block?

D

42. A pendulum swings as shown in the diagram. At which position is the kinetic energy of the pendulum bob least?

D

7. Which graph best represents the relationship between the velocity of an object thrown straight upward from Earth's surface and the time that elapses while it is in the air? (Neglect friction)

D

13. The graph shown represents the relationship between distance and time for an object in motion. During which interval is the speed of the object changing?

DE

A bowling ball was dropped from the same height and at the same time that a softball was thrown horizontally. Neglecting air resistance, which statement is true?

The bowling ball and softball hit the ground at the same time

The strong force is the force of

attraction between nucleons

The length of line AB shown is closest to one

centimeter

A reaction engine acquires motion by ejecting hot gases in the opposite direction. This is an example of the law of

conservation of momentum

As an object falls toward the Earth, its gravitational potential energy will

decrease

45. The diagram here shows a 1 kg stone being dropped from a bridge 100 meters above a gorge. As the stone falls, the gravitational potential energy of the stone

decreases

As a falling apple approaches the ground, its potential energy

decreases

As a pendulum travels from the highest point of its swing to the lowest point of its swing, its potential energy

decreases

25. The accompanying diagram shows a granite block being slid at constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?

frictional force and normal force on the block

As an object falls freely near the Earth's surface, the loss in gravitational potential energy of the object is equal to its

gain in kinetic energy

As a 1 kg mass falls freely to the Earth, its momentum

increases

If the speed of a moving object is doubled, which quantity associated with the object must also double?

its momentum

A unit of mass is the

kilogram

A box is pushed toward the right across a classroom floor. The force of friction on the box is directed toward the

left

The height of an average adult is approximately 1.75

m

The momentum of an object is the product of its

mass and velocity

Two rocks weighing 5 newtons and 10 N, fall freely from rest near the Earth's surface. After 3 seconds of free-fall, compared to the 5 N rock, the 10 N rock has greater

momentum

A 2 kg toy cannon is at rest on a frictionless surface. A remote triggering device causes a 0.005 kg projectile to be fired from the cannon. Which equation describes this system after the cannon is fired?

momentum of cannon + momentum of projectile = 0

11. The distance-time graph shown represents the motion of a laboratory cart. According to the graph, the cart is

moving at a constant speed

12. The graph shown represents the relationship between velocity and time for a 2 kilogram cart that is initially at rest and starts moving northward

north

As a pendulum moves from the bottom of its swing to the top of its swing, the

potential energy of the pendulum increases

The momentum of a rocket is equal to the

product of its mass and velocity

If the speed of an object is doubled, its kinetic energy will be

quadrupled

As the speed of a bicycle moving along a level horizontal surface changes from 2 m/s to 4 m/s, the magnitude of the bicycle's gravitational potential energy

remains the same

When objects exert forces on each other, the total momentum of the system

remains the same

The force that holds protons and neutrons together is known as the

strong force

88. As shown in the accompanying diagrams, a lump of clay travels horizontally to the right toward a block at rest on a frictionless surface. Upon collision, the clay and the block stick together and move to the right. Compared to the total momentum of the clay and block before the collision, the momentum of the clay block system after the collision is

the same

A mosquito flying over a highway strikes the windshield of a moving truck. Compared to the magnitude of the force of the truck on the mosquito during the collision, the magnitude of the force of the mosquito on the truck is

the same

A red ball and a green ball are simultaneously throw horizontally from the same height. The red ball has an initial speed of 40 meters per second and the green ball has an initial speed of 20 meters per second. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground will be

the same

As the car goes around the curve, the centripetal force is directed

toward the center of the circular curve

17. A car travels from A to B at a constant 100 km/hr. Which of the following changes?

velocity

Four solid blocks of different metals are placed in graduated cylinders containing water. Each block displaces the same amount of water. The property that all the blocks have in common is

volume