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Larry Harris Study Guide Physics & Chemistry Friction is a type of force that acts against motion. Gravity is the force of attraction between two objects due to their masses. The LAW OF UNIVERSAL GRAVITATION states that: All objects in the universe attract each other with gravitational force. The amount of gravitational force depends on the mass of the objects. The amount of gravitational force depends on the distance between two objects. Mathematical equation for the LAW OF UNIVERSAL GRAVITATION : Fg = Gx (m 1 *m 2 / r 2 ) Fg= force of gravity Gx= gravitational constant is always 6.67300*10 -11 m 3 kg -1 s -2 (m 1 / m 2 )= mass of object 1 & 2 R 2 = distance between the center points (radii) of each object Weight is a measure of gravity acting on mass. A vacuum is a place where there is no matter. Newton’s Second Law:
F= m a A= F/m =W/m = M g/ m A= g Newton’s first LAW OF MOTION
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Unformatted text preview: deals with cases in which the net force on an object is zero. Inertia is the tendency for objects to resist change in motion. Newton’s first law looks like this: An object at rest remains at rest unless acted on by an unbalanced force. An object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force. Balanced forces create a net force of zero and no movement. Unbalanced forces lead to movement. When you are sleeping, you are an object at rest. You remain at rest until your body applies a force to overcome gravity and get you out of bed. Newton’s second LAW OF MOTION looks like this: The acceleration of an object depends on its mass & the amount of force applied to it. Acceleration is the rate of change in velocity due to change….
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