Forces!

What Is Force?

It takes a force to move something.

A force is a push or a pull . . .

that causes an object to move, stop, or change direction.

When you push an object, it moves away from you.

When you pull an object, it moves toward or with you.

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

What is the pulling force called?

Some Types of Forces

• Gravity • Friction

• Magnetism • Erosion (wind and water)

Gravity

Gravity:the force that pulls all objects in the universe towards each other’s center.

GravityThe mass of an object determines how much gravity that object has. For example:

The moon and Earth are pulling on each other. The Earth is bigger than the moon so its gravitational pull is stronger. That is why the moon orbits the Earth. What would happen if the moon was bigger than the Earth?

Friction

Friction . . .a force that acts against something when two surfaces rub against each other.

A softball player sliding into home on the rough dirt has a lot of friction and can stop.

A sled on smooth ice will keep sliding and is hard to stop because it has only a little friction.

What causes the leaves to fall to the ground during the Autumn season? magne

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avity

What causes the leaves to fall to the ground during the autumn season?

A.Magnetism

B.A pushing force

C.Gravity

D.Erosion

What causes the leaves to fall to the ground during the Autumn season? magne

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The moving of an object is called --

A.force

B.friction

C.magnetism

D.gravity

What causes the leaves to fall to the ground during the Autumn season? magne

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avity

Which of the following is an example of a force that is different from gravity?

A. an apple dropping to the floor

B. a boy slamming a door

C. a leaf falling to the ground

D. water dripping from a faucet

What causes the leaves to fall to the ground during the Autumn season? magne

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avity

What force is represented in the above picture?

A. A pushing force

B. A pulling force

C. A magnetic force

D. Both A and C

Forces in My Everyday Life!

Pulling Forces Pushing Forces