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1 | |
Which pair of variables defines motion? |
| | A) | speed and distance |
| | B) | time and momentum |
| | C) | change of position and passage of time |
| | D) | speed and passage of time |
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2 | |
Which two fundamental properties are used to describe motion? |
| | A) | mass and distance |
| | B) | length and time |
| | C) | speed and time |
| | D) | distance and speed |
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3 | |
What is a difference between an object's speed and velocity? |
| | A) | Speed includes direction as well as the rate of travel. |
| | B) | Velocity includes time during which travel occurred. |
| | C) | Velocity includes the direction of travel whereas speed does not. |
| | D) | There is no difference. |
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4 | |
What feature of motion is described by acceleration? |
| | A) | The rate at which speed changes. |
| | B) | How quickly final velocity is reached. |
| | C) | The rate at which velocity changes. |
| | D) | Whether motion is speeding up or slowing down. |
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5 | |
Which of the following statements correctly states Newton's first law of motion? |
| | A) | Every object retains its state of rest or its state of accelerated straight-line motion unless acted upon by an unbalanced force. |
| | B) | Every object retains its state of rest or its state of uniform straight-line motion unless acted upon by a balanced force. |
| | C) | Every object retains its state of rest or its state of uniform straight-line motion unless acted upon by an unbalanced force. |
| | D) | None of the above is correct. |
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6 | |
The term inertia means which of the following? The tendency of an object to |
| | A) | maintain its mass. |
| | B) | remain in motion. |
| | C) | remain in rest or motion. |
| | D) | stop the motion of other objects. |
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7 | |
If the forces on an object are balanced, the object will |
| | A) | remain at rest if initially at rest. |
| | B) | continue moving in a straight line if initially moving in a straight line. |
| | C) | both A and B |
| | D) | neither A nor B |
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8 | |
According to Newton's second law of motion, acceleration is proportional to force. That means a larger force |
| | A) | produces a smaller acceleration. |
| | B) | doesn't affect acceleration. |
| | C) | produces a smaller mass. |
| | D) | produces a larger acceleration. |
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9 | |
Which of the following statements are true of both weight and mass? |
| | A) | Weight is a force, mass is a measure of inertia. |
| | B) | Mass depends on gravity, weight does not. |
| | C) | Heavier objects weigh more than light objects. |
| | D) | Gravity is necessary to measure both weight and mass. |
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10 | |
What is the unit of weight in the metric system? |
| | A) | kilogram |
| | B) | newton |
| | C) | pound |
| | D) | meters per second squared |
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11 | |
According to Newton's second law of motion, what causes a change in the motion of an object? A (An) |
| | A) | decrease in inertia. |
| | B) | change in velocity. |
| | C) | net force. |
| | D) | acceleration. |
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12 | |
Which of the following indicate that an object has been subjected to an unbalanced force? |
| | A) | The object speeds up. |
| | B) | The object slows down. |
| | C) | The object changes direction. |
| | D) | Any of the above. |
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13 | |
Which of the following correctly states Newton's third law of motion? Forces occur in matched pairs that are |
| | A) | equal in magnitude and equal in direction. |
| | B) | opposite in magnitude and equal in direction. |
| | C) | equal in magnitude and opposite in direction. |
| | D) | opposite in magnitude and opposite in direction. |
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14 | |
A person walking on a level surface moves forward because the forces of |
| | A) | his feet pushing forward on the ground. |
| | B) | his feet pushing backward on the ground. |
| | C) | the ground pushing forward on his feet. |
| | D) | the ground pushing backward on his feet |
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15 | |
Which statement correctly characterizes momentum, as understood in the physical sciences? |
| | A) | Momentum is a measure of an object's tendency to continue moving. |
| | B) | An object with a large momentum has a large mass. |
| | C) | An object with a large momentum has a large velocity. |
| | D) | The product of mass and velocity is large for an object with a large momentum. |
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16 | |
What are the metric units for momentum? |
| | A) | kg • m/s2 |
| | B) | newton |
| | C) | kg • m/s |
| | D) | newton • m |
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17 | |
In Newton's second law of motion, what is the relationship between acceleration and mass? Acceleration |
| | A) | is directly proportional to mass. |
| | B) | is inversely proportional to mass. |
| | C) | does not depend on mass. |
| | D) | is divided by mass. |
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18 | |
The conservation of momentum is correctly expressed by which of the following statements? The total momentum of interacting objects |
| | A) | always remains the same. |
| | B) | remains the same if there are no internal forces. |
| | C) | remains the same if there are no external forces. |
| | D) | usually remains the same. |
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19 | |
If an astronaut, freely floating in space, tries to throw away a spent fuel container that has the same mass as the astronaut himself, what will happen to the astronaut? |
| | A) | Nothing happens to the astronaut. He will stay where he is and the container will fly away at the speed given to it by the astronaut. |
| | B) | The astronaut will recoil slightly but quickly stop while the container continues moving away at a constant speed. |
| | C) | The astronaut moves away in an opposite direction just as fast as the container moves. |
| | D) | Nothing happens to the astronaut or container. The astronaut cannot throw the container since he has no firm ground to stand on. |
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20 | |
In order for an object to move in a circular path at a constant speed, which set of conditions must be satisfied? |
| | A) | A force must be applied once to start circular motion, then the object will continue in a circular path. |
| | B) | A force must be applied continuously against the object's motion to cause it to turn away into a circular path. |
| | C) | A force must be applied continuously at right angles to the object's motion to produce a circular path. |
| | D) | No force need be applied since speed remains constant. |
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21 | |
According to Newton's law of gravity, force between two objects depends on the objects' masses and separation according to which correct statement? The force is directly proportional to the |
| | A) | total mass and inversely proportional to the distance of separation. |
| | B) | product of the masses and inversely proportional to the separation. |
| | C) | separation and inversely proportional to the product of the masses. |
| | D) | product of the masses and inversely proportional to the distance of separation squared. |
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22 | |
What happens to the gravitational force between two objects if their separation is doubled? The force of attraction is |
| | A) | doubled. |
| | B) | the same. |
| | C) | half as much. |
| | D) | one fourth as much. |
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23 | |
How does the force of gravity on an astronaut orbiting in the space shuttle compare with the force of gravity on the same astronaut when she is standing on the earth's surface? |
| | A) | The force of gravity is the same both places. |
| | B) | The force of gravity is less in the space shuttle. |
| | C) | There is no gravitational force in orbit because the astronaut is weightless. |
| | D) | Not enough information was given to answer the question. |
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24 | |
How does an astronaut's mass while orbiting in the space shuttle compare with his mass while standing on the earth's surface? |
| | A) | The mass is the same in both places. |
| | B) | The astronaut's mass is less when he is in orbit. |
| | C) | The astronaut has no mass in orbit since he is weightless. |
| | D) | Not enough information was given to answer the question. |
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25 | |
The force of gravity on the moon is 1/6 as large as on the earth. How does free-fall acceleration on the moon compare with free-fall acceleration on the earth? Free-fall acceleration will be |
| | A) | the same on the earth and moon. |
| | B) | 6 times larger on the moon. |
| | C) | 1/3 as large on the moon. |
| | D) | 1/6 as large on the moon. |
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