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P. Sci.

P. Sci. Motion & Forces: Newton’s Laws of Motion. Force. Copy This. What causes an object’s position to change. A push or a pull. Force cont. Net force = the combination of all forces acting on an object.

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P. Sci.

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  1. P. Sci. Motion & Forces: Newton’s Laws of Motion

  2. Force Copy This • What causes an object’s position to change. A push or a pull.

  3. Force cont. • Net force = the combination of all forces acting on an object. • If 0 (they cancel out) the object does not move or it moves at a constant velocity. (balanced force)

  4. Force cont. • If not 0 the object will move in the direction of the net force. (unbalanced force) • If there is a net force, acceleration will take place. Either the object will change direction or change speed.

  5. Newton’s 1st Law Copy This • An object at rest remains at rest, an object in motion remains in motion unless acted on by an unbalanced force.

  6. 1st Law AKALaw of Inertia Copy This • Inertia – the tendency for an object to resist a change in motion.

  7. Newton’s 2nd Law • The unbalanced force acting on an object equals the object’s mass times its acceleration

  8. Copy This 2nd Law AKAF = ma • Force is measured in Newtons (N) • 1N = 1kg x m/s2 Ten times as much.

  9. Newton’s 3rd Law Copy This • For every action force, there is an equal and opposite reaction force.

  10. AKA Law of Action/ReactionNewton’s 3rd Law • When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body.

  11. Consider the propulsion of a fish through the water. A fish uses its fins to push water backwards. In turn, the water reacts by pushing the fish forwards, propelling the fish through the water. • The size of the force on the water equals the size of the force on the fish; the direction of the force on the water (backwards) is opposite the direction of the force on the fish (forwards).

  12. Momentum Copy This • Property of moving objects resulting from its mass and velocity. • Comes from Newton’s Third Law Momentum (p)= mass x velocity p=m x v

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