 # Review A force is any push or ____________.

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Review A force is any push or ____________.
Force is measured in the unit _____________ ionsforcesandtime/force/

2 groups of forces CONTACT FORCES Examples: Friction Normal Applies
FORCES ACTING FROM A DISTANCE Examples” Electrical Magnetic Gravity

Applied Force a force that is applied (by contact) to an object by a person or another object Examples) pushing open a door lifting weights throwing a ball moving a box

Friction The force of one object or surface rubbing against another. It opposes motion. STATIC: Stays still KINETIC: Moving (Examples) snowboarding car driving on the road lab table against the floor

2 factors that effect Friction
Surfaces touching Pressure of objects

Effects of friction Objects slow down Objects heat up

Normal Force the support force exerted upon an object that is in contact with another stable (still) object Examples) book on a table standing on the ground leaning against the wall

Electrical Force The force of charges (positive and negative) that react with each other -The closer together the particles are, the stronger the force they create Example) lightening in picture above

Gravitational Force The force that pulls objects towards each other Weight is the force of gravity on an object Any object with mass (matter) has gravity= The Law of Universal Gravitation

2 things affect gravity Mass Distance between objects

Magnetic Force Magnetic poles attracting or repelling

Some other forces: Tension: force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends

Some other forces: Spring Force: the force exerted by a compressed or stretched spring upon any object that is attached to it

When the forces are ______________, they cause an object to speed up, slow down, or change direction.

The overall amount of forces acting on an object is a _________ force
The overall amount of forces acting on an object is a _________ force. If the forces are acting in the same way then add them Boy= 20 N Girl =20N = 40 N

If the forces are opposite, subtract them.

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