Forces and Magnet

Review

Force, Gravity, Friction

Grade 3 - Unit 5 Force and Forcemeters | By Ms. Mona​

• A force is push or pull

• Forces have direction and strength and are represented by arrows.

• Forces can be contact or

  non-contact.​

Force

Multiple Choice

Observe the picture: Push or Pull?

• Push

• Pull

Fill in the Blanks

What is defined as a push or pull and is measured in the unit of Newton (N)?

Multiple Select

What are the effects of Forces? (mark more than 1)

• Move an object

• Stop a moving object

• Change its direction

• Change the speed of an object

• Change the shape of an object

Multiple Choice

When you're playing with clay, which effect of forces is there?

• Move an object

• Stop a moving object

• Change its direction

• Change the speed of an object

• Change the shape of an object

• Forces can be measured using Forcemeter.

• ​Forces are measured in the standard unit of newton (N).

​​Measuring Forces

Open Ended

Why do we use the standard unit for measuring instead of the non-standard unit?

Multiple Choice

The strength of forces can be measured using ...

• forcemeter

• newton

• frictionmeter

Multiple Choice

The standard unit used to measure forces is the ...

• Gravity

• Meter

• Newton

Multiple Choice

The amount of force needed to pull this boot is ...

• 5 N

• 6 N

• 7 N

• 10 N

• The Earth’s gravity is a force that pulls objects towards the center of the Earth.

• Gravity makes objects have weight.​

• In Science, weight (Newton) isn't the same as mass (kg, gram, etc).​

Gravity​

Multiple Choice

Down is the same direction everywhere

on Earth. T/F

• TRUE

• FALSE

Multiple Choice

Objects are pulled towards the center of the Earth because of . . .

• Friction

• Gravity

• Wind

Multiple Choice

Is there gravity anywhere else in space?

• No. Only earth has gravity

• Yes. Every star, planet, and moon has gravity.

• When an object moves on another object it makes a force called friction.

• The friction pushes against the movement, so it slows down the moving object.​

• ​A surface that has lots of friction can be called a grippy surface.

• ​A surface that only has a little friction is called a slippery surface.​

Friction

Multiple Choice

The bigger friction is on the ______ surface

• rough

• smooth

Fill in the Blanks

Force that opposite with the motion when two surface contact is called

Fill in the Blanks

​A surface that has lots of friction can be called a

surface.

Fill in the Blanks

A surface that only has a little friction is called a

surface.​

Multiple Choice

Tom sliding on a rough surface. The friction is small. TRUE/FALSE?

• TRUE

• FALSE

• Magnet comes in different shapes.

• All magnets have a north pole and a south pole.

• The north pole is sometimes colored red and the south pole is colored blue.

• Magnetism: a force used by magnets to push or pull objects.

Magnet

Fill in the Blanks

A force used by magnets to push or pull objects is called

.

Multiple Choice

Some magnets only have one pole: north pole or south pole.

True/False?

• TRUE

• FALSE

• Materials that are pulled towards a magnet are called magnetic materials.​

  ​

• ​Materials that are not attracted to a magnet are called non-magnetic materials.

Magnets attract, Magnets repel

Multiple Choice

Two north poles always _____.

• Attract

• Repel

• Magnetism

• magnetic

Fill in the Blanks

When things pull together, we say they

Multiple Choice

All metals are magnetic materials.

True/False?

• TRUE

• FALSE

Multiple Choice

Materials that are not metal are _____.

• magnetic

• non-magnetic

• magnetism

Multiple Choice

Below are non-magnetic materials, except _____.

• Iron

• aluminum can

• plastic

• wood