Question 1

A man whose mass is 80 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.His weight there is

Accepted Answer

A) 87 N. 
B) 196 N. 
C) 261 N. 
D) 784 N. 
A) 87 N. 
B) 196 N. 
C) 261 N. 
D) 784 N. A

Question 2

Mars is about 1.5 times as far from the sun as the earth and its mass is about 0.1 times the earth's mass.Relative to the gravitational force the sun exerts on the earth, the force it exerts on Mars is about

Accepted Answer

A) 0.0044 as much. 
B) 0.0067 as much. 
C) 0.044 as much. 
D) 0.067 as much. 
A) 0.0044 as much. 
B) 0.0067 as much. 
C) 0.044 as much. 
D) 0.067 as much. C

Question 3

A 3000-kg truck accelerates from 10 m/s to 30 m/s in 8 s.The net force on the truck is

Accepted Answer

A) 765 N. 
B) 7500 N. 
C) 11,250 N. 
D) 15,000 N. 
A) 765 N. 
B) 7500 N. 
C) 11,250 N. 
D) 15,000 N. B

Question 4

A ball is thrown upward with a speed of 30 m/s.It will continue to rise for about

Accepted Answer

A) 0.33 s. 
B) 1.5 s. 
C) 3.1 s. 
D) 6.1 s. 
A) 0.33 s. 
B) 1.5 s. 
C) 3.1 s. 
D) 6.1 s.

Question 5

Ball A is thrown horizontally and ball B is thrown upward.

Accepted Answer

A) Ball A has the greater downward acceleration. 
B) Ball B has the greater downward acceleration. 
C) They have the same downward acceleration. 
D) Neither has any downward acceleration. 
A) Ball A has the greater downward acceleration. 
B) Ball B has the greater downward acceleration. 
C) They have the same downward acceleration. 
D) Neither has any downward acceleration.

Question 6

A car moving at 15 m/s comes to a stop in 10 s.Its acceleration is

Accepted Answer

A) -1.5 m/s2. 
B) -0.67 m/s2. 
C) 0.67 m/s2. 
D) 1.5 m/s2. 
A) -1.5 m/s2. 
B) -0.67 m/s2. 
C) 0.67 m/s2. 
D) 1.5 m/s2.

Question 7

As a spacecraft moves upward,

Accepted Answer

A) its mass decreases. 
B) its mass increases. 
C) its weight decreases. 
D) its weight increases. 
A) its mass decreases. 
B) its mass increases. 
C) its weight decreases. 
D) its weight increases.

Question 8

The acceleration of gravity on the surface of Mars is 3.7 m/s2.Compared with his or her mass and weight on Earth, an astronaut on Mars has

Accepted Answer

A) less mass and less weight. 
B) less mass and more weight. 
C) the same mass and less weight. 
D) less mass and the same weight. 
A) less mass and less weight. 
B) less mass and more weight. 
C) the same mass and less weight. 
D) less mass and the same weight.

Question 9

A net horizontal force of 2000 N is applied to an 800-kg car at rest.The car's speed after 5 s will be

Accepted Answer

A) 1.3 m/s. 
B) 2.5 m/s. 
C) 6.25 m/s. 
D) 12.5 m/s. 
A) 1.3 m/s. 
B) 2.5 m/s. 
C) 6.25 m/s. 
D) 12.5 m/s.

Question 10

A net force of 10 N gives an object an acceleration of 5 m/s2.What net force would give the same object an acceleration of 1 m/s2?

Accepted Answer

A) 1 N 
B) 2 N 
C) 5 N 
D) 50 N 
A) 1 N 
B) 2 N 
C) 5 N 
D) 50 N

Question 11

The weight of an object

Accepted Answer

A) is less than its mass. 
B) is equal to its mass. 
C) is greater than its mass. 
D) None of the choices are correct. 
A) is less than its mass. 
B) is equal to its mass. 
C) is greater than its mass. 
D) None of the choices are correct.

Question 12

A car starts from rest and reaches a speed of 12 m/s in 20 s.Its acceleration is

Accepted Answer

A) 0.6 m/s2. 
B) 4 m/s2. 
C) 6 m/s2. 
D) 240 m/s2. 
A) 0.6 m/s2. 
B) 4 m/s2. 
C) 6 m/s2. 
D) 240 m/s2.

Question 13

A 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N.The minimum turning radius of the car is

Accepted Answer

A) 15 m. 
B) 30 m. 
C) 60 m. 
D) 120 m. 
A) 15 m. 
B) 30 m. 
C) 60 m. 
D) 120 m.

Question 14

The earth and the moon exert equal and opposite forces on each other.The force the earth exerts on the moon

Accepted Answer

A) is the action force. 
B) is the reaction force. 
C) can be considered either as the action or as the reaction force. 
D) cannot be considered as part of an action-reaction pair because the forces act in opposite directions. 
A) is the action force. 
B) is the reaction force. 
C) can be considered either as the action or as the reaction force. 
D) cannot be considered as part of an action-reaction pair because the forces act in opposite directions.

Question 15

An airplane reaches its takeoff speed of 60 m/s in 30 s starting from rest.The time it spends in going from 40 m/s to 60 m/s is

Accepted Answer

A) 10 s. 
B) 15 s. 
C) 20 s. 
D) 25 s. 
A) 10 s. 
B) 15 s. 
C) 20 s. 
D) 25 s.

Question 16

If the moon were half as far from the earth as it is now, the gravitational force it exerts on the earth would be

Accepted Answer

A) one-quarter its present value. 
B) half its present value. 
C) twice its present value. 
D) four times its present value. 
A) one-quarter its present value. 
B) half its present value. 
C) twice its present value. 
D) four times its present value.

Question 17

A car whose initial speed is 40 m/s undergoes a constant acceleration of -5 m/s2 when its brakes are applied.How much time does the car take to come to a stop?

Accepted Answer

A) 8 s 
B) 16 s 
C) 30 s 
D) 200 s 
A) 8 s 
B) 16 s 
C) 30 s 
D) 200 s

Question 18

The radius of the path of an object moving in a circle at constant speed is halved.If the speed remains the same, the centripetal force needed is

Accepted Answer

A) one-quarter as much as before. 
B) half as much as before. 
C) twice as much as before. 
D) four times as much as before. 
A) one-quarter as much as before. 
B) half as much as before. 
C) twice as much as before. 
D) four times as much as before.

Question 19

A moose weighing 3 kN is standing still.The force the ground exerts on the moose is

Accepted Answer

A) 0. 
B) more than 0 but less than 3 kN. 
C) 3 kN. 
D) more than 3 kN. 
A) 0. 
B) more than 0 but less than 3 kN. 
C) 3 kN. 
D) more than 3 kN.

Question 20

A stone is thrown upward from a roof at the same time as another, identical stone is dropped from there.The two stones

Accepted Answer

A) reach the ground at the same time. 
B) have the same speed when they reach the ground. 
C) have the same acceleration when they reach the ground. 
D) None of the choices are correct. 
A) reach the ground at the same time. 
B) have the same speed when they reach the ground. 
C) have the same acceleration when they reach the ground. 
D) None of the choices are correct.

A man whose mass is 80 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.His weight there is

Mars is about 1.5 times as far from the sun as the earth and its mass is about 0.1 times the earth's mass.Relative to the gravitational force the sun exerts on the earth, the force it exerts on Mars is about

A 3000-kg truck accelerates from 10 m/s to 30 m/s in 8 s.The net force on the truck is

A ball is thrown upward with a speed of 30 m/s.It will continue to rise for about

Ball A is thrown horizontally and ball B is thrown upward.

A car moving at 15 m/s comes to a stop in 10 s.Its acceleration is

As a spacecraft moves upward,

The acceleration of gravity on the surface of Mars is 3.7 m/s².Compared with his or her mass and weight on Earth, an astronaut on Mars has

A net horizontal force of 2000 N is applied to an 800-kg car at rest.The car's speed after 5 s will be

A net force of 10 N gives an object an acceleration of 5 m/s².What net force would give the same object an acceleration of 1 m/s²?

The weight of an object

A car starts from rest and reaches a speed of 12 m/s in 20 s.Its acceleration is

A 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N.The minimum turning radius of the car is

The earth and the moon exert equal and opposite forces on each other.The force the earth exerts on the moon

An airplane reaches its takeoff speed of 60 m/s in 30 s starting from rest.The time it spends in going from 40 m/s to 60 m/s is

If the moon were half as far from the earth as it is now, the gravitational force it exerts on the earth would be

A car whose initial speed is 40 m/s undergoes a constant acceleration of -5 m/s² when its brakes are applied.How much time does the car take to come to a stop?

The radius of the path of an object moving in a circle at constant speed is halved.If the speed remains the same, the centripetal force needed is

A moose weighing 3 kN is standing still.The force the ground exerts on the moose is

A stone is thrown upward from a roof at the same time as another, identical stone is dropped from there.The two stones

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Exam 2: Motion

A man whose mass is 80 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.His weight there is

Mars is about 1.5 times as far from the sun as the earth and its mass is about 0.1 times the earth's mass.Relative to the gravitational force the sun exerts on the earth, the force it exerts on Mars is about

A 3000-kg truck accelerates from 10 m/s to 30 m/s in 8 s.The net force on the truck is

A ball is thrown upward with a speed of 30 m/s.It will continue to rise for about

Ball A is thrown horizontally and ball B is thrown upward.

A car moving at 15 m/s comes to a stop in 10 s.Its acceleration is

As a spacecraft moves upward,

The acceleration of gravity on the surface of Mars is 3.7 m/s2.Compared with his or her mass and weight on Earth, an astronaut on Mars has

A net horizontal force of 2000 N is applied to an 800-kg car at rest.The car's speed after 5 s will be

A net force of 10 N gives an object an acceleration of 5 m/s2.What net force would give the same object an acceleration of 1 m/s2?

The weight of an object

A car starts from rest and reaches a speed of 12 m/s in 20 s.Its acceleration is

A 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N.The minimum turning radius of the car is

The earth and the moon exert equal and opposite forces on each other.The force the earth exerts on the moon

An airplane reaches its takeoff speed of 60 m/s in 30 s starting from rest.The time it spends in going from 40 m/s to 60 m/s is

If the moon were half as far from the earth as it is now, the gravitational force it exerts on the earth would be

A car whose initial speed is 40 m/s undergoes a constant acceleration of -5 m/s2 when its brakes are applied.How much time does the car take to come to a stop?

The radius of the path of an object moving in a circle at constant speed is halved.If the speed remains the same, the centripetal force needed is

A moose weighing 3 kN is standing still.The force the ground exerts on the moose is

A stone is thrown upward from a roof at the same time as another, identical stone is dropped from there.The two stones

The Scientific Method

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters

The acceleration of gravity on the surface of Mars is 3.7 m/s².Compared with his or her mass and weight on Earth, an astronaut on Mars has

A net force of 10 N gives an object an acceleration of 5 m/s².What net force would give the same object an acceleration of 1 m/s²?

A car whose initial speed is 40 m/s undergoes a constant acceleration of -5 m/s² when its brakes are applied.How much time does the car take to come to a stop?