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# How do forces affect motion Adapted by Diane Gioia Bell s Crossing Elementary - PowerPoint PPT Presentation

How do forces affect motion? Adapted by Diane Gioia Bell’s Crossing Elementary. Forces always work in pairs. One force pushes in one direction, and the other pushes with equal strength in the opposite direction.

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### How do forces affect motion?Adapted by Diane GioiaBell’s Crossing Elementary

One force pushesin one direction, and the other pushes with equal strength in the opposite direction.

Walking demonstrates action and reaction becauseone foot pushes on the ground as the ground pushes the body forward.

Forces reaction force.

A push or pull is called a force and forces make things move faster or slower, stop, change direction, or change size and shape.

Types of Forces reaction force.

Magnetism

A force that acts at a distance and cannot be seen. The closer the objects, the greater the magnetic force.

The needle of a compass moves because of Earth’s magnetism.

Magnetism reaction force.

Materials that create this force are said to be magnetic and are called magnets.

The closer the objects, the greater the magnetic force.

Types of Forces reaction force.

Friction:

The force that opposes motion between two surfaces that are touching.

Types of Forces reaction force.

Friction

Friction reaction force.

The rougher the surfaces are, the harder they press together, the more friction there will be.

A smooth surface allows you to go faster, while a rough surface would be easier to stop on.

Friction surface would be

• Occurs between liquids and gases as well as between solids.

• Without friction you would not be able to slow or stop the motion of objects.

Loss of surface would be

Friction

http://www.school-for-champions.com/science/images/friction_uses-bear.jpg

Friction surface would be

Friction can be reduced by using lubricants, for example motor oil, wax, grease, by making surfaces smoother, or by using rollers.

Lubrication surface would be

Lubrication, for example, oil or grease, reduces the effects of friction. Without lubrication, moving parts of machines would slow down or stop very quickly.

Types of Forces surface would be

How does gravity

affect motion?

Gravity surface would be

What do

you think it is?

Gravity surface would be is a force that

makes any object

attract, or pull toward,

another object.

Gravity surface would be

• The attraction is not noticeable unless one of the objects is very large.

Earth is so big it

keeps everything

on the

ground.