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School Physics Quiz : Work & Energy


Answer the following questions based on work & energy.

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Multiple choice

Your Performance  

1.

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

  mass

  force

  pressure

  Half-n-half Clue  
 

2.

A mass of 90 kg is moved vertically upwards through a distance of 11 m. If the gravitational acceleration is 9.8 m s-2, then the work done against gravity is

  107.8 J

  9702 J

  882 J

  990 J

  Half-n-half Clue  
 

3.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 160 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  28 m/s

  56 m/s

  8 m/s

  40 m/s

  Half-n-half Clue  
 

4.

A body loses 1372 J of potential energy in falling through 20 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  196 kg

  140 kg

  69 kg

  7 kg

  Half-n-half Clue  
 

5.

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

  True

  False

 

6.

A carton is pulled along the ground for a distance of 3 m. If the average frictional force is 77 N, then the work done is

  231 J

  3 J

  77 J

  693 J

  Half-n-half Clue  
 

7.

A body loses 5292 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

  88 kg

  588 kg

  540 kg

  9 kg

  Half-n-half Clue  
 


 
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