Class 4 Force Work and Energy

What is force?

• Energy required to move objects

• Movement of objects

• Push or pull acting on an object

• Resistance to motion

When you push or pull a toy car, it will:

• Stop moving

• Remain still

• Move

• Change color

If two people push a toy car in opposite directions, the car will:

• Move faster

• Stop moving

• Move in the direction of one person's push

• Not move

What can force do to a moving object?

• Stop it

• Increase its speed

• Change its direction

• All of the above

Work is done when:

• An object remains still

• A force is applied, and the object moves

• A force is applied, and the object stops

• No force is applied

When reading or doing homework, work is not done because:

• No force is applied

• The object moves

• The object stops

• Both "No force is applied" and "The object stops"

Which situation involves more work: carrying one book or two books?

• Carrying one book

• Carrying two books

• Carrying a heavier book

• None of the above

Energy is required for:

• Cooking food

• Writing

• Breathing

• Both "Cooking food" and "Breathing"

What form of energy helps in cooking food and boiling water?

• Electrical energy

• Heat energy

• Chemical energy

• Solar energy

Solar energy is primarily obtained from:

• The moon

• The sun

• Stars

• Lightning