Some problem of Work and Energy

Physics 1 - Work, Power, Energy Worksheet

1.  Calculate the work done by a 47 N force pushing a pencil 0.26 m.

2.  Calculate the work done by a 47 N force pushing a 0.025 kg pencil 0.25 m against a force   of  23 N.

3.  Calculate the work done by a 2.4 N force pushing a 400 g sandwich across a table 0.75 m wide.

4.  How far can a mother push a 20.0 kg baby carriage, using a force of 62 N, if she can only do 2920 J of work?

5.  How much work is it to lift a 20 kg sack of potatoes vertically 6.5 m?

6.  If a small motor does 520 J of work to move a toy car 260 m, what force does it exert?

7.  A girl pushes her little brother on his sled with a force of 300 N for 750 m.  How much work is this if the force of friction acting on the sled is (a) 200 N,             (b) 300 N?

8.  A 75.0 kg man pushes on a 500,000 t wall for 250 s but it does not move.  How much work does he do on the wall?

9.  A boy on a bicycle drags a wagon full of newspapers at 0.80 m/s for 30 min using a force of 40 N.  How much work has the boy done?

10.  What is the gravitational potential energy of a 61.2 kg person standing on the roof of a 10-storey building relative to (a) the tenth floor, (b) the sixth floor, (c) the first floor. (Each storey is 2.50 m high.)