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Motion and Forces Force- a push or pull applied to an object Net Force-When two or more forces act on an object at the same time Net Force Not Equal and favoring the left Friction- the force that opposes the sliding motion of two touching surfaces Type of Friction Description Example Static Friction in which two forces are not moving past one another. Pushing a fridge across a floor Sliding Friction where two forces are moving past one another. Sledding down a hill Rolling Friction between a rolling object and the surface it rolls on. Skateboard moving on the ground Fluid Friction when object moves through fluid, meaning either a liquid or gas. skydiving Air Resistance- friction-like force that opposes motion of objects that move through air-depends on speed, size, and shape of an object Newton’s 3 Laws of Motion Newton’s 1st Law An object in motion stays in motion or an object at rest stays at rest until acted upon by an unbalanced force. https://www.youtube.com/watch?v=08BFCZJDn9w Newton’s 2nd Law Acceleration is produced when a force acts on mass. The greater the mass, the greater the amount of forced needed to accelerate the object. https://www.youtube.com/watch?v=nO7XeYPi2FU Newton’s 3rd Law For every action, there is an equal and opposite reaction. https://www.youtube.com/watch?v=EgqcGrB3re8