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Transcript
Newton’s Laws Newton’s First Law: The Law of Inertia • An object at rest will stay at rest unless acted upon by a force, and an object in motion will stay in motion unless acted upon by a force. • In other words … Newton’s Second Law: F=MA • An object’s acceleration depends on its mass and the net force acting upon it. • In other words … Newton’s Third Law • For every action there is an equal but opposite reaction. • In other words … Free Fall and Circular Motion Free Fall • Free fall is when acceleration is caused only by gravity. • The longer something falls, the faster it falls. • The speed of gravity is 9.8 m/s2. 0.0 9.8 19.6 29.4 39.2 Circular Motion • Centripetal force causes an object to move in a circular motion. • It is usually a combination of forces. Example: the combination of the ball’s inertia with the pull of the string causes a centripetal force and the ball travels in a circle. Going into Orbit If you could throw a ball fast enough and high enough, (about 17,000 mph) it would be equal to the pull of gravity, creating a centripetal force.