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Transcript

Cheri Scheer Force and Motion Force and motion Science 7 Strand 2 Objective 1a, 2a, b, d,e,f GLE link overview Effects of Motion graph Average speed- distance divided by time Distance- average speed x time Velocity- speed of object and direction of motion Acceleration- change in velocity divided by time needed for the change. Force- push or pull Measured in Newtons Pounds x 4.4 Force= mass x acceleration Force Two forces in the same direction equals the sum of the forces Two equal forces in opposite directions equals no net force Two unequal forces act in opposite directions equal the difference in the forces PRACTICE Newton’s 1st Law of Motion An object will not change motion unless unbalanced force act on it. Object at stays at rest, object in motion stays in motion (until it is is acted on) Effects motion Friction- force between two surface in contact that resist each other Inertia- tendency to resist change Mass of object will effect both. Newton’s 2nd law of motion Object is acted on by net force the acceleration is in the direction of the force and equal to the force divided by mass. Acceleration = net force Mass Newton’s 3rd law When one object exerts a force on a second object, the second object also exerts an equal force in the opposite direction