Question

E. Give reasons for the following.
1. You push a wall so hard that you break into a sweat. However, according to science.
you have not done any work.
2. Inclined planes are used to load and unload trucks.
3. Class-three levers are called speed multipliers.
4. Movable parts of a machine should be oiled or greased.
the following.​

Answer 1

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