Balanced and Unbalanced Forces and Net Force

Balanced and Unbalanced Forces

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A Force

A force is a push or a pull that causes a change in an objects motion. Forces are measured in units called Newtons.

Multiple Choice

What is a force?

• A push or a pull that changes an objects motion

• How fast an object is traveling

• How much mass an object has

• How close to objects get to each other

Multiple Choice

Forces are measured in

• Newtons

• Grams

• Volume

• Centimeters

Forces work in pairs

There are always two or more forces that affect an objects motion. The size of the forces determines the motion an object will have.

Multiple Choice

Forces always work in

• pairs

• the dark

• the same direction

• only one wz

Balanced Forces

When two forces acting on an object are equal and in opposite directions then the forces are balanced and the object will not move. The forces "cancel" each other out.

Multiple Choice

Balanced forces will

• cause an object to move

• not cause an object to move

Unbalanced Forces

When two forces acting on an object are in opposite directions but are not equal then the forces are unbalanced and the object will move. The forces don't "cancel" each other out so there is movement.

Multiple Choice

Unbalanced forces will

• cause an object to move

• not cause an object to move

Motion of an object

When forces are unbalanced they cause a change in an objects motion. Unbalanced forces can cause objects to start or stop moving, speed up or slow down, or change directions.

Multiple Choice

Unbalanced force can cause objects to start moving.

• True

• False

Multiple Choice

Unbalanced force can cause objects to stop moving.

• True

• False

Multiple Choice

Unbalanced force can cause objects to change directions.

• True

• False

Multiple Choice

Unbalanced force can cause objects to speed up.

• True

• False

Multiple Choice

Unbalanced force can cause objects to slow down.

• True

• False

Multiple Choice

What affect do forces have on an object?

• They can change the motion of an object

• They can make objects bigger

• They can make objects change from one form into another

• They can make objects smaller.

Multiple Choice

What type of force causes objects to not move?

• Balanced forces

• Unbalanced forces

Multiple Choice

What type of force causes objects to move?

• Balanced forces

• Unbalanced forces

Multiple Choice

When the forces acting upon an object are balanced then the object

• will not move

• will move

Multiple Choice

When the forces acting upon an object are unbalanced then the object

• will not move

• will move

Forces in action

The motion of a baseball that gets hit by a batter changes because of forces.

How forces affect the motion of a baseball

When a batter hits a ball the ball rises into the air and at point A it starts to SLOW DOWN because of the force of gravity.

How forces affect the motion of a baseball

At point B the ball CHANGES DIRECTIONS. It was moving upward but at point B it has changed directions and is moving downward.

How forces affect the motion of a baseball

At point C gravity pulls the ball towards the center of the Earth and it SPEEDS UP.

How forces affect the motion of a baseball

At point D the ball hits the ground and once it stops moving it is experiencing balanced forces.

Multiple Choice

What is the balls motion at point A?

• Slows down

• Speeds up

• Changes directions

• Hits the ground

Multiple Choice

What is the balls motion at point B?

• Slows down

• Speeds up

• Changes directions

• Hits the ground

Multiple Choice

What is the balls motion at point C?

• Slows down

• Speeds up

• Changes directions

• Hits the ground

Multiple Choice

What is the balls motion at point D?

• Slows down

• Speeds up

• Changes directions

• Hits the ground