FORCES 5TH GRADE

FORCES

FORCES

​A force is what makes objects move

There are two types of forces: contact forces and non-contact forces.

In contact forces there is contact between objects. You need to touch them.

In non-contact forces there is no contact between objects. They act at a distance.

CONTACT FORCES

​They use a push or a pull to move objects

They have different effects:

1. Make an object start moving.

2. Make an object stop moving.

3. Make an object change shape.

4. Make an object break.

Open Ended

What is a force?

Open Ended

What types of forces are there?

Multiple Choice

Contact forces use a push or a pull to move objects. Look at the photo and choose the correct word.

• PUSH

• PULL

Multiple Choice

Choose the correct photo for this effect: A force makes an object stop moving

​CHANGES OF SHAPE

Some objects can change shape PERMANENTLY. They don't go back to their original shape when the force finishes acting on them.

Other objects change their shape TEMPORARILY. They go back to their original shapee when the force finishes acting on them.

Multiple Choice

What type of change is it?

• TEMPORARY

• PERMANENT

Multiple Choice

What type of change is it?

• TEMPORARY

• PERMANENT

Multiple Choice

If we STRETCH rubber, it ...

• BREAKS

• CHANGES TEMPORARILY

• CHANGES PERMANENTLY

Multiple Choice

If we MODEL clay, it ...

• BREAKS

• CHANGES TEMPORARILY

• CHANGES PERMANENTLY

Multiple Choice

If we TEAR paper, it ...

• BREAKS

• CHANGES TEMPORARILY

• CHANGES PERMANENTLY

A force can make an object stop moving. However, if we let the object move and we don't stop it, it will finally stop. Why? Because of friction.

Friction is a contact force that occurs then two objects rub against each other. The object that doesn't move (= the surface) applies an opposed movement to the moving object and it slows down until it stops.

FRICTION IS A CONTACT FORCE

Multiple Choice

On which surface will be easier to skate?

Multiple Choice

It is easier to skate on ice because there is ...

• LESS FRICTION

• MORE FRICTION

Multiple Choice

It is easier to skate on ice because it is a ...

• SMOOTH SURFACE

• ROUGH SURFACE

NON-CONTACT FORCES

​They don't use contact to move objects

There are two types:

1. Magnetism

2. Gravity

​MAGNETISM

Magnetism is a non-contact force produced by magnets.

Magnets have magnetic fields that attract metal objects

Magnets have two poles: North (N) and South (S).

When we put the same poles of two magnets together they repel.

When we put opposite poles of two magnets togehter they attract.

Open Ended

What is the name of this force?

Multiple Choice

Magnetism is a contact force

• TRUE

• FALSE

Multiple Choice

What will happen to these two magnets?

• They will attract

• They will repel

Multiple Choice

When two magnets are near and their poles are South with North they will ...

• ATTRACT

• REPEL

GRAVITY

Gravity is a non-contact force that pulls everything towards the centre of the Earth.

If we drop a ball the force of gravity makes it fall to the ground

Gravity is a non-contact force that pulls everything towards the centre of the Earth

​A) We throw a ball up in the air.

B) It goes up quickly until it stops and the force of gravity makes it fall to the ground.

C) It goes faster until it is on the ground

GRAVITY

A) We drop a ball

B) The force of gravity makes it fall to the ground.

C) It goes faster until it is on the ground.

Fill in the Blanks

What does the red arrow represent?

Fill in the Blanks

What does the blue arrow represent?

Multiple Choice

A person falls down through the air more slowly with a parachute.

• TRUE

• FALSE