8.1 FORCE

8.1 fORCE

by KASMAWATI Moe

Force and type of forces

So, a push moves things away from you and a pull moves things closer to you.

Pushes and pulls create a force.

When you open a door you use a force.

Forces can start and stop things moving. They can also make things go faster, slower or change directions.

Multiple Choice

What is a Force?

• The distance

• Mass

• A push or pull

• Give me a failing grade

Multiple Choice

Some forces can act over a distance, and others can only act by contact. Which type of force can act only when two objects touch each other?

• gravitational

• frictional

• electrical

Multiple Choice

What is he doing?

• PUSHING the doors

• PULLING the doors

Multiple Choice

What is he doing now?

• PUSHING the doors

• PULLING the doors

Multiple Choice

What are they doing?

• Peppermint is pulling the door and Charlie Brown pushed the door.

• Peppermint is pushing the door and Charlie Brown pulled the door.

Multiple Choice

Forces can be:

• Pushes only

• Pulls only

• Pushes and pulls

Multiple Choice

The illustration below shows what happened when a balloon touched a girl’s hair.

Which type of force caused the girl’s hair to cling to the balloon?

• magnetic force

• frictional force

• electrical force

• gravitational force

Multiple Choice

A boy rides a skate board down a hill. Eventually the skate board stops. Which is most responsible for causing the skateboard to stop?

• gravity acting on the skateboard

• friction acting on the skateboard

• the mass of the skateboard

• the mass of the boy

Multiple Choice

Magnets can be a useful tool. Look closely at the picture below which shows a magnet and various metal objects.

What will happen as the magnet moves closer to the metal objects?

• The magnet will attract the objects.

• The magnet will become heavier.

• The magnet will push the objects away

• Nothing will happen to the objects

Multiple Choice

A book falls off the desk. What moves the book towards the floor?

• mass

• friction

• gravity

• speed

Multiple Choice

Rina’s mother asked her to help move some items from the hall closet to the garage. One item she wanted to move was a large box of old school books. Rina tried to lift the box, but could not pick it up. What force was Rina NOT able to overcome? 

• frictional force
  frictional forcefrictional force
• gravitational force
• electrical force
• magnetic force 
  magnetic force
  

Multiple Choice

What will happen to the book if no other forces act upon it?

• book will stay at rest

• book will begin to move

• mass of the book will increase

• gravity on the book will increase

Multiple Choice

_________ opposes motion.

• acceleration

• gravity

• friction

• inertia

Multiple Choice

. A girl placed a leaf in a stream. After 5 minutes, the leaf moved 100 yards away from the girl. Which best explains why leaf changed it position?

• the pulling force of the wind

• the pushing force of the stream

• the pulling force of the leaf against the water

• the pushing force of the leaf against the water.

Multiple Choice

An object drops due to the force of _____________.

• inertia

• momentum

• friction

• gravity

Multiple Choice

Mark and Ann were playing kickball. They both kicked the same ball, but noticed that Mark kick made the ball travel farther than Ann's. What most likely caused the difference?

• Mark kicked with less force

• Mark kicked with more force

• Mark kick had less friction

• the pushing force of the leaf against the water.

Multiple Choice

What force holds the planets in motion around the sun?

• Magnetic

• Electrical

• Gravitational

• Air Resistance

Multiple Select

1. A push or a pull on an object is:

• stationary

• its weight

• a pressure

• a force

Multiple Choice

This type of force resist motion between two surfaces that are pressed together

• contact
• gravity
• friction

Multiple Choice

Forces can change the

• slow down or speed up objects only

• speed, direction or shape of an object

• movement of objects but only if they were already in motion

Multiple Choice

To reduce friction, one could:

• place extra weight on the object that is moving

• remove wheels to reduce the downward pressure in trolleys

• use a lubricant such as grease

Multiple Choice

Molly is trying to improve on hitting a softball. Which will most likely help to improve Molly’s hitting?

• a lighter ball and a lighter bat
• a heavier ball and a lighter bat
• a lighter ball and a heavier bat
• a heavier ball and a heavier bat

Multiple Choice

What is force?

• A force is a push or a pull upon an object resulting from the object's interaction with another object.
• something used in Star Wars 
• It is the amount of space between two points.
• It is Superman's power

Multiple Choice

What is the standard unit force is measured in?

• Newtons
• pounds
• grams
• meters