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NEWTON’S LAWS TEST REVIEW Which of Newton’s Laws states for every action there is an equal and opposite reaction? 3 Which of Newton’s laws states that an object in motion will remain in motion unless acted upon by unbalanced forces? 1 The amount of gravitational force between 2 objects depends on which two factors? Mass of objects Distance between objects 1 Pound = ? Newtons 4.448 N What is the weight of a 250 kg person? 250x9.8 = 2450 N What unbalanced force is needed to give a 1000 Kg truck an acceleration of 3 m/s2? 3000 N A .50 Kg metal ball experiences a net force of 2 Newtons as it rolls down a ramp. What is the acceleration of the ball? 4 What is the units for acceleration? m/s2 Any object that is thrown or shot through the air is called a Projectile How do you find an object’s momentum? Mass x velocity What is the momentum of a 100 kg man running at a speed of 5 m/s (include correct units)? 500 kg x m/s What is the velocity of a 100 kg man with a momentum of 400 kg x m/s (include correct units)? 4 m/s How does the total momentum of 2 objects before a collision compare to the total momentum after a collision? Same due to Law of Conservation of Momentum An object that has balanced forces acting upon it would have a Net FORCE equal to zero When air resistance balances the weight of a falling object, the object reaches its top speed called Terminal velocity The resistance of an object to changing its motion is called inertia The amount of matter in an object is called its Mass A vector quantity includes both Magnitude and Direction The value of acceleration for objects in free fall near earth is __________ (include correct units) 9.8 m/s2 In the Newton Car lab the rubber bands applied an action force to the small block of wood, what was the reaction force? Block of wood on Newton car If forces occur in pairs and are equal and opposite why do they not cancel each other out? They are acting on different objects What is the net force on the box below? -40 N -25 N 15 N