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School Physics Quiz : Work & Energy


Answer the following questions based on work & energy.

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Multiple choice

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1.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 250 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  50 m/s

  70 m/s

  10 m/s

  35 m/s

  Half-n-half Clue
 

2.

By definition, work is done when a _______ moves through a distance.

  force

  pressure

  mass

  Half-n-half Clue
 

3.

If there is no friction, the efficiency of a machine can be greater than 100 %.

  True

  False

 

4.

A body loses 2058 J of potential energy in falling through 30 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  69 kg

  294 kg

  210 kg

  7 kg

  Half-n-half Clue
 

5.

The energy losses from machines are mostly dissipated as sound energy.

  True

  False

 

6.

A pebble is dropped from the top of a cliff 72 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.

  18 m

  54 m

  36 m

  24 m

  Half-n-half Clue
 

7.

A carton is pulled along the ground for a distance of 10 m. If the average frictional force is 45 N, then the work done is

  45 J

  450 J

  4500 J

  10 J

  Half-n-half Clue
 


 
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