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AP Physics    Chapters 7 & 8 Review Sheet 
 
1.| Which of the following is NOT a pay unit for clip?|
A)| erg| |
B)| ft?lb| |
C)| watt| |
D)| newton?meter| |
E)| joule| |
 
 
2.| A boy holds a 40-N weight at arms length for 10 s. His arm is 1.5 m higher up the ground. The work done by the persuasiveness of the boy on the weight while he is holding it is:|
A)| 0| |
B)| 6.1 J| |
C)| 40 J| |
D)| 60 J| |
E)| 90 J| |
 
 
3.| An object moves in a circle at unalterable speed. The work done by the centripetal force is null because:|
A)| the displacement for each revolution is zero| |
B)| the average force for each revolution is zero| |
C)| there is no attrition| |
D)| the magnitude of the acceleration is zero| |
E)| the centripetal force is right to the velocity| |
 
 
4.



| The work done by gravity during the line of products of a projectile is:|
A)| positive| |
B)| interdict| |
C)| zero| |
D)| depends for its ratify on the direction of the y axis| |
E)| depends for its sign on the direction of both the x and y axes| |
 
 
5.| Aline vex to the shortstop is caught at the same height as it was before hit. Over its entire flight the work done by gravity and the work done by air resistance, respectively, ar:|
A)| zero; positive| |
B)| zero; negative| |
C)| positive; negative| |
D)| negative; positive| |
E)| negative; negative| |
 
 
6.| A maul (including load) weighs 5000 N. It is pulled on level snow by a go after team exerting a horizontal force on it. The coefficient of energizing friction between sled and snow is 0.05. How much work is done by the dog team pulling the sledge 1000 m at constant speed?|
A)| 2.5 ? 104 J| |
B)| 2.5 ? 105 J| |
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