Forces,Motion & Simple Machines Review

Ø Equal forces acting on an object in opposite directions. Will not change an objects motion.

Ø When a net force changes an objects motion causes an object to move.

Ø When an objects distance from another objects is changing.

Ø The overall force acting on an object.

Ø A place or object used for comparison to determine if something is in motion.

Ø Both the speed and direction of an object.

Ø Meter

Ø All over the world

Ø Speed- the distance traveled by a moving object per unit of time. Avg.speed- total distance traveled compared to the total time. Constant speed- speed that does not change.

Ø Divided the distance an object traveled by the time it took to travel.

Ø 30km/s

Ø Incline plane, wedge, screw, lever, wheel and axle, pulley.

Ø a flat slanted surface , a ramp.

Ø an inclined plane wrapped around a cylinder, bolts, faucets, jar lids.

Ø an inclined plane that can move, instead of an object moving along an inclined plane. The inclined plane itself moves. Example- zipper.

Ø a simple machine made of two circular objects that rotate on a common axis. Example: screwdriver or doorknob.

Ø a rigid bar that is free to rotate or pivot on a fixed point. A force is exerted on one end and the other end goes in the opposite direction. Example: removing a lid from a paint can.

Ø a grooved wheel with a rope wrapped around it.

A fixed pulley is attached to a structure.
A moveable pulley is attached to something you want to move.

Pulleys are used to lift objects.
Example: window blinds


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