Question

Give reasons.
A stretched catapult has potential energy.
A stone on ground has zero energy.
Rolling a drum is work against friction.
Work and energy both have same unit.
Lifting a stone is work against gravity.

Answer 1

1. A stretched catapult has potential energy because it can perform work when released.
2. A stone on the ground has no energy because it will never move on its own again.
3. There needs to be friction between an object and the ground for it to roll (otherwise it will slide)
4. You must overcome the weight, which is the force of gravity, in order to lift a stone.
5. Joules are units used to quantify both energy and work.

What is energy?

• A moving object's kinetic energy, a potential energy cached by an object (for instance because of its location in a field),
• Its elastic energy contained inside a fixed material, chemical energy linked to chemical reactions, radiant energy undertaken by electromagnetic radiation.
• As well as internal energy embedded within a thermodynamic system are examples of common forms of energy.
• Energy is constantly being consumed and expended by all living things.

Energy analysis of given question is illustrated below:

A stretched catapult has potential energy because it can perform work when released.

A stone on the ground has no energy because it will never move on its own again.

There needs to be friction between an object and the ground for it to roll (otherwise it will slide)

You must overcome the weight, which is the force of gravity, in order to lift a stone.

Joules are units used to quantify both energy and work.

Learn more about energy here:

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