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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 body loses 4116 J of potential energy in falling through 60 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  420 kg

  588 kg

  7 kg

  69 kg

  Half-n-half Clue
 

2.

A carton is pulled along the ground for a distance of 8 m. If the average frictional force is 96 N, then the work done is

  6144 J

  8 J

  768 J

  96 J

  Half-n-half Clue
 

3.

A pebble is dropped from the top of a cliff 48 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.

  36 m

  24 m

  16 m

  12 m

  Half-n-half Clue
 

4.

A body loses 686 J of potential energy in falling through 10 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  98 kg

  69 kg

  70 kg

  7 kg

  Half-n-half Clue
 

5.

A machine that produces 75 J of work by using 100 J of energy has an efficiency of

  75 %

  25 J

  25 %

  15 J

  Half-n-half Clue
 

6.

A mass of 11 kg is raised through a vertical distance of 30 m. If the gravitational acceleration is 9.8 m s-2, then the potential energy gained by the mass is

  108 J

  294 J

  3234 J

  330 J

  Half-n-half Clue
 

7.

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

  True

  False

 


 
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