Available Answers

1. 1.

   Circle the correct answer.

   1. Elastic Force / Gravitational Force is used to move a catapult..
   2. The force that stops a moving body is called frictional force / elastic force.
   3. Tools make work easy / difficult.
   4. Lever / Pulley is made from a wheel and a rope.
   5. A screw / wedge is a machine which looks like a nail with grooves cut into it.
2. 2.

   Fill in the blanks.

   1. Simple machines are ______________ that make our work easier.
   2. Some tools change the ______________ of force used.
   3. Some tools help us to work with less ______________.
   4. A screw is used to ______________ things together.
   5. The ______________ to do work is called energy.
3. 3.

   Which would need more physical energy? Tick (√) the correct answer.

   1. Riding a bicycle on level ground.
   2. Riding a bicycle up a hill.
   3. Walking on the road.
   4. Doing your homework.
4. 4.

   Write the functions of the different kinds of energy.

   1. Solar energy
   2. Energy from the wind.
   3. Electrical energy
5. 5.

   Name the kind of energy used in.

   1. a doorbell
   2. burning coal
   3. solar cooker
   4. a watch
   5. swimming
6. 6.

   Name five different sources of energy.