Ch 4 Test Review. Why do we say a speeding object doesn t have force? (Assume this object is speeding through space) (Explain)

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1 Ch 4 Test Review Why do we say a speeding object doesn t have force? (Assume this object is speeding through space) (Explain) If the forces that act on a cannonball and the recoiling cannon from which it is fired are equal in magnitude, why do the cannonball and cannon have very different accelerations? For each of the following interactions, identify action and reaction forces. (A) A hammer hits a nail. (B) Earths gravity pulls down on you. (C) A helicopter blade pushes air downward. When you drop a rubber ball on the floor it bounces almost to its original height. What causes the ball to bounce? Think about the action and reaction forces that would actually cause the bouncing. Suppose two carts, one twice as massive as the other, fly apart when the compressed spring that joins them is released. Which cart experiences the greater force of the spring? Does the lighter cart roll (faster or slower) compared to the heavier cart? How much faster or slower? Why does it roll faster or slower?

2 If you exert a horizontal force of 200 N to slide a crate across a factory floor at a constant velocity, how much friction does the floor exert o the crate? Is the force of friction equal and oppositely directed to your 200 N push? If the force of friction isn t the reaction force to your push, what is? Ken and Joanne are astronauts floating some distance apart in space. They are joined by a safety cord whose ends are tied around their waists. If ken starts pulling on the cord, will he pull Joanne toward him, or will he pull himself closer to Joanne, or will both astronauts move? Explain. (Id the Force Pairs which lead you to your answer) If you apply a net force of 10 N on a cart with a mass of 2 kg, what is the acceleration? If you increase the speed of a 8.0 kg air puck from rest by 5.0 m/s in 2.0 s, what force do you exert on it? (Need to use both equations for acceleration to solve) A boxer punches a sheet of paper in midair, and brings it from rest up to a speed of 30 m/s in.05 s. If the mass of the paper is.004 kg, what force does the boxer exert on it? (Need to use both equations for acceleration to solve) If you stand next to a wall on a frictionless skateboard and push the wall with a force of 30 N, how hard does the wall push on you? If your mass is 60 kg, what s your acceleration?

3 If you walk on a log that is floating in water, the log moves backwards. Why? If a truck and a bicycle have a head on collision, which vehicle imparts the larger force? Which vehicle undergoes the greater change in acceleration? Why? While driving down the road, a firefly strikes the windshield of a bus and makes a quite obvious mess in front of the face of the driver. This is a clear case of Newton's third law of motion. The firefly hit the bus and the bus hits the firefly. Which of the two forces is greater: the force on the firefly or the force on the bus? For years, space travel was believed to be impossible because there was nothing which rockets could push off of in space in order to provide the propulsion necessary to accelerate. This inability of a rocket to provide propulsion is because... a.... space is void of air so the rockets have nothing to push off of. b.... gravity is absent in space. c.... space is void of air and so there is no air resistance in space. d.... nonsense! Rockets do accelerate in space and have been able to do so for a long time. Many people are familiar with the fact that a rifle recoils when fired. This recoil is the result of action-reaction force pairs. A gunpowder explosion creates hot gases which expand outward allowing the rifle to push forward on the bullet. Consistent with Newton's third law of motion, the bullet pushes backwards upon the rifle. The acceleration of the recoiling rifle is... a. greater than the acceleration of the bullet. b. smaller than the acceleration of the bullet. c. the same size as the acceleration of the bullet.

4 In the top picture (below), Kent Budgett is pulling upon a rope which is attached to a wall. In the bottom picture, the Kent is pulling upon a rope which is attached to an elephant. In each case, the force scale reads 500 Newtons. Kent is pulling... a. with more force when the rope is attached to the wall. b. with more force when the rope is attached to the elephant. c. the same force in each case. Identify at least six pairs of action-reaction force pairs in the following diagram. 1) Action Reaction 2) Action Reaction 3) Action Reaction 4) Action Reaction 5) Action Reaction 6) Action Reaction

5 ESSAY: Two identical spring loaded dart guns are fired straight down twords the ground from the same height. One fires a regular dart and the other a weighted dart. Newtons 3 rd law: Which dart would experience the greater amount of force from the spring and why. Newtons 2 nd law: Which dart would experience the greater rate of accleration and why? Newtons 1 st law: Which dart would have a greater resistance to a change in its motion and why? Citing your resoning from Newton s 3 laws explain in detail which dart would reach the ground first and why.

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