Newton's Law Test Study Guide .docx



Newton’s Laws Newton’s First Law- an object in motion stays in motion, an object at rest stays at rest unless acted on by an outside forceNewton’s Second Law- Acceleration depends on the objects mass and the net force acting on it Newton’s Third Law- every action has an equal and opposite reaction Use the definitions of Newton’s Laws above to identify which law is being demonstrated in the examples. A force of 60 Newton’s produces twice the acceleration on an object as a force of 30 Newton’s (both objects are of equal mass).An athlete can throw a tennis ball faster than a bowling ball.A person sitting in a boat tosses a heavy rock in one direction. The boat moves in the opposite direction. A car slams on it’s breaks but the person in the front seat continues to move forward until stopped by the seat beat.A rocket blasting off from The Earth.A heavy train takes longer to stop than a lighter carForce equals mass times accelerationA golf ball sitting on a tee waiting to be hit.A hockey player on the ice pushes another player but moves backwards himself.A person is playing pool and when he hits the white ball into the other balls they all move in opposite directionsVocabulary- be familiar with the vocabulary terms below Inertia- resistance to change in motion, it is dependent on massMomentum- is related to mass and velocity Law of Conservation of Momentum- Momentum remains the same unless acted on by an outside force ( friction)Free Fall- motion where acceleration is caused by gravityCentripetal Force- always point to the center of the circle an object is moving in, if you could turn of centripetal force inertia would make the object move in a straight lineGravity- a force that pulls objects toward each other Formulas Acceleration= Net force MassMass = ForceAccelerationNet Force= Mass x Acceleration Momentum= Mass x Velocity Practice ProblemsIf a truck accelerated at a rate of 3 m/s2 and had a mass of 1000 Kg, what force did the engine supply?A duck landed in a pond. The water provided 5 N of stopping force and the duck decelerated at a rate of 1 m/s2. What is the mass of the duck? ................
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