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1 | |
The total linear energy of colliding bodies before impact must always equal the total energy after impact. |
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| | A) | True |
| | B) | False |
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2 | |
The vigor with which a body restores itself to its original shape after deformation is a measure of its elasticity or restitution. |
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| | A) | True |
| | B) | False |
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3 | |
A coefficient of restitution equal to 0.5 is an indication that the collision is inelastic. |
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| | A) | True |
| | B) | False |
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4 | |
The units for impulse are equivalent to the units for momentum. |
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| | A) | True |
| | B) | False |
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5 | |
An object that has linear momentum also has kinetic energy. |
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| | A) | True |
| | B) | False |
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6 | |
The foot-pound per second is a unit of linear momentum. |
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| | A) | True |
| | B) | False |
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7 | |
An object bouncing against a floor with perfectly elastic collisions will continue to bounce at the same height. |
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| | A) | True |
| | B) | False |
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8 | |
Momentum is a scalar quantity. |
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| | A) | True |
| | B) | False |
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9 | |
Momentum is conserved in all collisions. |
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| | A) | True |
| | B) | False |
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10 | |
The kilogram-meter per second is a larger unit of momentum than the slug-foot per second. |
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| | A) | True |
| | B) | False |
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11 | |
Which of the following is not a unit of impulse? |
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| | A) | Pound-second |
| | B) | Newton-second |
| | C) | Pound-hour |
| | D) | Newton-meter |
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12 | |
When the velocity of a body is doubled, |
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| | A) | its kinetic energy is doubled |
| | B) | its momentum is doubled |
| | C) | its acceleration is doubled |
| | D) | its potential energy is doubled |
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13 | |
A 100-kg astronaut releases 1 g of gas from a special pistol at a speed of 50 m/s.
As a result, he moves in the opposite direction at |
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| | A) | 5 cm/s |
| | B) | 50 cm/s |
| | C) | 0.5 cm/s |
| | D) | 0.05 cm/s |
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14 | |
If a car is to gain momentum, it must |
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| | A) | move rapidly |
| | B) | accelerate |
| | C) | lose inertia |
| | D) | lose weight |
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15 | |
The face of a golf club exerts an average force of 4000 N while it is in contact with the golf ball. If the impulse is 80 N * s, the time of contact is |
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| | A) | 0.2 s |
| | B) | 0.02 s |
| | C) | 2 s |
| | D) | 0.002 s |
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16 | |
In a completely elastic collision, which of the following quantities need not be conserved? |
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| | A) | Kinetic energy |
| | B) | Momentum |
| | C) | Mass |
| | D) | Potential energy |
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17 | |
Eight steel balls are suspended from equal heights by threads so that they are all in contact. If two balls are pulled away to the left and released, |
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| | A) | one ball will leave from the right with twice the speed |
| | B) | two balls will leave from the right at approximately the same speed |
| | C) | either (a) or (b) might apply |
| | D) | neither (a) nor (b) applies |
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18 | |
A 40-kg cart moving at 3 m/s makes a head-on collision with a 20-kg cart at rest, as illustrated in Fig. 9-2. If the collision is completely inelastic, the speed with which the carts leave the impact is approximately
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| | A) | 2 m/s |
| | B) | 6 m/s |
| | C) | 20 m/s |
| | D) | 0.2 m/s |
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19 | |
If the collision in Question 18 is completely elastic, the speed of the 20-kg cart after collision will be approximately |
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| | A) | 6 m/s |
| | B) | 3 m/s |
| | C) | 4 m/s |
| | D) | 2 m/s |
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20 | |
A 10-g bullet is fired into a 2-kg block of wood suspended from a cord. If the block and bullet rise to a height of 10 cm after impact, the initial velocity of the bullet was approximately |
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| | A) | 2.8 m/s |
| | B) | 281 m/s |
| | C) | 235 m/s |
| | D) | 28.1 m/s |
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21 | |
An elastic collision is one in which both and are conserved. |
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22 | |
is the product of mass and velocity and has the metric units . |
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23 | |
The negative ratio of the relative velocities after impact to the relative velocities before impact is known as the . |
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24 | |
The product of the average force acting on a body and the time of action is called and it is equal to the of the body. |
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25 | |
The coefficient of restitution has a maximum value of for a perfectly impact and a minimum value of for a perfectly impact. |
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26 | |
If two colliding bodies stick together after impact and move off with the same velocity, the impact is said to be . |
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27 | |
In USCS, the unit for impulse is , and the unit for momentum is . |
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28 | |
When a rifle is fired, the of the bullet is the same as the recoil of the rifle. |
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29 | |
The square root of the ratio of the height to which a ball bounces to its original height is a measure of the . |
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30 | |
The vigor with which an object restores itself to its original shape after deformation is a measure of its . |
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