Question 1

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. C

Question 2

A car that starts from rest with a constant acceleration travels 50 m in the first 5 s. The car's acceleration is

Accepted Answer

A)  2 m/s2. 
B)  4 m/s2. 
C)  10 m/s2. 
D)  20 m/s2. 
A)  2 m/s2. 
B)  4 m/s2. 
C)  10 m/s2. 
D)  20 m/s2. B

Question 3

The mass of a 2,200-lb elephant is

Accepted Answer

A)  224 kg. 
B)  1,000 kg. 
C)  4,840 kg. 
D)  21,560 kg. 
A)  224 kg. 
B)  1,000 kg. 
C)  4,840 kg. 
D)  21,560 kg. B

Question 4

Relative to what she weighs on the earth, an astronaut visiting another planet

Accepted Answer

A)  weighs less. 
B)  weighs the same. 
C)  weighs more. 
D)  Any of these choices, depending on the planet. 
A)  weighs less. 
B)  weighs the same. 
C)  weighs more. 
D)  Any of these choices, depending on the planet.

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 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.

Question 7

In the first 3 s after a car starts from rest with an acceleration of 4 m/s2 it will travel

Accepted Answer

A)  6 m. 
B)  12 m. 
C)  18 m. 
D)  72 m. 
A)  6 m. 
B)  12 m. 
C)  18 m. 
D)  72 m.

Question 8

After a stone dropped from a cliff has fallen 20 m, the stone's speed is approximately

Accepted Answer

A)  10 m/s. 
B)  20 m/s. 
C)  196 m/s. 
D)  392 m/s. 
A)  10 m/s. 
B)  20 m/s. 
C)  196 m/s. 
D)  392 m/s.

Question 9

A car whose speed is a steady 50 km/h

Accepted Answer

A)  cannot be accelerated. 
B)  is accelerated when it climbs a hill. 
C)  is accelerated when it descends a hill. 
D)  is accelerated when it climbs a hill, goes over the crest, and descends on the other side. 
A)  cannot be accelerated. 
B)  is accelerated when it climbs a hill. 
C)  is accelerated when it descends a hill. 
D)  is accelerated when it climbs a hill, goes over the crest, and descends on the other side.

Question 10

On a rainy day the maximum frictional force between a car's tires and a certain level road surface is reduced to half its usual value. The maximum safe speed for rounding a curve is

Accepted Answer

A)  unchanged. 
B)  reduced to 25% of its usual value. 
C)  reduced to 50% of its usual value. 
D)  reduced to 71% of its usual value. 
A)  unchanged. 
B)  reduced to 25% of its usual value. 
C)  reduced to 50% of its usual value. 
D)  reduced to 71% of its usual value.

Question 11

A car starts from rest with a constant acceleration of 5 m/s2. How much time does the car take to cover the first 160 m?

Accepted Answer

A)  8 s 
B)  16 s 
C)  32 s 
D)  64 s 
A)  8 s 
B)  16 s 
C)  32 s 
D)  64 s

Question 12

The time needed for a car whose speed is 60 km/h to travel 800 m is

Accepted Answer

A)  0.48 min. 
B)  0.8 min. 
C)  4.5 min. 
D)  13 min. 
A)  0.48 min. 
B)  0.8 min. 
C)  4.5 min. 
D)  13 min.

Question 13

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s2. In the next 5 s the car travels

Accepted Answer

A)  15 m. 
B)  25 m. 
C)  55 m. 
D)  65 m. 
A)  15 m. 
B)  25 m. 
C)  55 m. 
D)  65 m.

Question 14

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 15

Which one or more of the following pairs of displacements cannot be added to give a resultant displacement of 2 m?

Accepted Answer

A)  1 m and 1 m. 
B)  1 m and 2 m. 
C)  1 m and 3 m. 
D)  1 m and 4 m. 
A)  1 m and 1 m. 
B)  1 m and 2 m. 
C)  1 m and 3 m. 
D)  1 m and 4 m.

Question 16

According to Newton's third law of motion,

Accepted Answer

A)  there is no such thing as a single force acting on an object. 
B)  for every force there is an equal and opposite reaction force, but each acts on a different object. 
C)  action and reaction forces need not be equal, but must act in opposite directions. 
D)  action and reaction forces must be equal, but need not act in opposite directions. 
A)  there is no such thing as a single force acting on an object. 
B)  for every force there is an equal and opposite reaction force, but each acts on a different object. 
C)  action and reaction forces need not be equal, but must act in opposite directions. 
D)  action and reaction forces must be equal, but need not act in opposite directions.

Question 17

The speed of an object moving in a circle is doubled. 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 18

A ball thrown upward at 30 m/s will reach the ground after about

Accepted Answer

A)  1.0 s. 
B)  2.0 s. 
C)  6.0 s. 
D)  8.0 s. 
A)  1.0 s. 
B)  2.0 s. 
C)  6.0 s. 
D)  8.0 s.

Question 19

When a 430-g soccer ball is kicked, the impact lasts for 0.04 s. In order for the ball to fly off at 8 m/s, the force of the kick must be

Accepted Answer

A)  86 N. 
B)  138 N. 
C)  178 N. 
D)  86 kN. 
A)  86 N. 
B)  138 N. 
C)  178 N. 
D)  86 kN.

Question 20

The minimum number of unequal forces whose vector sum can equal zero is

Accepted Answer

A)  2. 
B)  3. 
C)  4. 
D)  5. 
A)  2. 
B)  3. 
C)  4. 
D)  5.

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

A car that starts from rest with a constant acceleration travels 50 m in the first 5 s. The car's acceleration is

The mass of a 2,200-lb elephant is

Relative to what she weighs on the earth, an astronaut visiting another planet

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

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

In the first 3 s after a car starts from rest with an acceleration of 4 m/s² it will travel

After a stone dropped from a cliff has fallen 20 m, the stone's speed is approximately

A car whose speed is a steady 50 km/h

On a rainy day the maximum frictional force between a car's tires and a certain level road surface is reduced to half its usual value. The maximum safe speed for rounding a curve is

A car starts from rest with a constant acceleration of 5 m/s². How much time does the car take to cover the first 160 m?

The time needed for a car whose speed is 60 km/h to travel 800 m is

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s². In the next 5 s the car travels

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

Which one or more of the following pairs of displacements cannot be added to give a resultant displacement of 2 m?

According to Newton's third law of motion,

The speed of an object moving in a circle is doubled. The centripetal force needed is

A ball thrown upward at 30 m/s will reach the ground after about

When a 430-g soccer ball is kicked, the impact lasts for 0.04 s. In order for the ball to fly off at 8 m/s, the force of the kick must be

The minimum number of unequal forces whose vector sum can equal zero is

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Exam 2: Motion

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

A car that starts from rest with a constant acceleration travels 50 m in the first 5 s. The car's acceleration is

The mass of a 2,200-lb elephant is

Relative to what she weighs on the earth, an astronaut visiting another planet

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

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

In the first 3 s after a car starts from rest with an acceleration of 4 m/s2 it will travel

After a stone dropped from a cliff has fallen 20 m, the stone's speed is approximately

A car whose speed is a steady 50 km/h

On a rainy day the maximum frictional force between a car's tires and a certain level road surface is reduced to half its usual value. The maximum safe speed for rounding a curve is

A car starts from rest with a constant acceleration of 5 m/s2. How much time does the car take to cover the first 160 m?

The time needed for a car whose speed is 60 km/h to travel 800 m is

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s2. In the next 5 s the car travels

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

Which one or more of the following pairs of displacements cannot be added to give a resultant displacement of 2 m?

According to Newton's third law of motion,

The speed of an object moving in a circle is doubled. The centripetal force needed is

A ball thrown upward at 30 m/s will reach the ground after about

When a 430-g soccer ball is kicked, the impact lasts for 0.04 s. In order for the ball to fly off at 8 m/s, the force of the kick must be

The minimum number of unequal forces whose vector sum can equal zero is

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

The Universe Galaxies

Filters

In the first 3 s after a car starts from rest with an acceleration of 4 m/s² it will travel

A car starts from rest with a constant acceleration of 5 m/s². How much time does the car take to cover the first 160 m?

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s². In the next 5 s the car travels