Force:a push or pull that acts on an object. The man pushed his skateboard on the road.
Contact force: a force that requires two pieces of matter to touch.
Friction: is the force when tow materials rub against each other or when their contact prevents sliding. Spencer rubbed his hands together and it created heat.
Wedge-simple machine made of one or two inclined planes. There is a wedge between the two sides of the canyon
Pulley-simple machine consulting of a rope or cable that runs around a grooved wheel.
Accelaration-the rate at wich the speed of direction of motion of an object changes overtime.
Gravity- the force of attraction between any two object.
Interia- the tendency of an object that resist any change of motion
Screw-simple machine consisting of a smooth cylinder with a tiny incline plane wrapped around it.
Wheel and axle-simple machine made up of a circular object attached to a bar.
Simple machine- a machine made up of one or two parts.
Lever- a type of simple machine in which a bar moves around a fixed point called fulcrum.
Incline- a simple machine consisting of a flat surface with one end higher than the other.