# FORCES A force is a push or a pull on an object. Every force has strength, magnitude and direction. Forces acting on a stationary object can set the object.

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FORCES A force is a push or a pull on an object. Every force has strength, magnitude and direction. Forces acting on a stationary object can set the object in motion. They can also change the object’s speed or the direction it is moving in. Forces can also change the shape of a stationary object.

GRAVITY Why do things fall to the ground? Gravity is the force of attraction between all objects that have mass. The strength of gravity between two objects depends on two things: the mass of the objects and the distance between them.

Electric and Magnetic Forces These forces are closely related. Both are cause by negative and positive charges in matter. Electric forces are associated with unmoving charges. Magnetic forces are created by moving electric chages.

Friction -Friction is the force that opposes motion between two surfaces that are in contact with each other. -Friction might prevent motion from starting, or it might oppose motion in progress. -Types of friction include sliding, rolling, static and fluid.

Balanced and Unbalanced Forces -More than one force can – and usually does- act on an object at the same time. -Sometimes these forces are applied in the same direction. -Sometimes the forces are applied in different directions. -The net force on an object is the combination of all the forces acting on it. -Force is measured in newtons. -Force is shown with arrows.

Balanced Forces -When the net force is zero, the forces are said to be balanced. Balanced forces produce no change in the motion of an object. -An object that is not moving will stay motionless, while an object that is moving will maintain its speed and direction. Balanced forces can, however, crush an object.

Unbalanced Forces -When the net force on an object is greater than zero, the forces are said to be unbalanced. Unbalanced forces produce a change in the motion of an object. - A motionless object will begin to move, while an object already moving will change its speed and/or direction.

Calculating Net Force - To find the net force of forces that are acting in the same direction, simply add them together. -to find the net force of forces that are acting in opposite directions, simply subtract the smaller force from the larger one.

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