Force Lesson Energy Transfer

Energy Transfer

4th Grade

Vocabulary

• Motion is when something is moving

• Energy is the ability to do work

• Energy Transfer happens when energy moves from one place to another

• Acceleration is when the speed or direction of an object is changing

Multiple Choice

What is energy?

• When something is moving

• The ability to do work

• Something that can only stop things

Laws of Motion

• The Law of Inertia

• The Law of Acceleration

• The Law of Action and Reaction

The Law of Inertia

An object will stay still or continue in motion until a force acts on it.

Examples:

A box will stay still unless you push on it.

A ball will keep rolling unless something stops it.

Multiple Choice

If an object is at rest (not moving) it will...

• start moving

• stay at rest

Open Ended

If you kick a soccer ball on the grass, why does the ball eventually stop?

The Law of Acceleration

The weight of an object will change how much force is needed for it to move or accelerate.

Example:

If you push against a feather and a rock with the same force, the feather will go a farther distance since it is lighter. The rock would need more force to go the same distance.

Multiple Choice

What object would need more force to accelerate?

• A bowling ball

• A golf ball

• A bouncy ball

• A baseball

The Law of Action and Reaction

Every action has an equal and opposite reaction.

Example:

When a person pushes against a wall, the wall will push back with an equal force in the opposite direction

Multiple Choice

As a car's tires push against the road, what pushes back on the car's tires?

• The driver

• The road

• Gravity