Download NEWTON`S THIRD LAW ANSWERS

NEWTON’S THIRD LAW ANSWERS 1. 2. 3. 4. 5. 6. If your weight is the force created by gravity on your body, what is the reaction force? You pulling on the Earth If you jump off of a ledge and accelerate toward the Earth, the Earth will accelerate toward you at the same time due to Newton’s Third Law. Why don’t we see the earth move in this situation? The acceleration is so tiny because of earth’s enormous mass, it is undetectable. There is nothing in outer space for rocket exhaust gasses to push against. How then can a rocket accelerate in outer space? (And yes, we do know that they can accelerate in outer space, this is not a trick question!) The action is the rocket pushing the gasses, the reaction is the gasses pushing the rocket. No other objects are needed. A friend is arguing Newton’s Third Law with you. He states that when a bullet fires from a gun there must be an equal and opposite force backward on the bullet, and that these forces would cancel each other out. Therefore, he says, there is no way a bullet would be able to move, and this means Newton’s Third Law doesn’t work. How would you enlighten your confused friend? There is only one force acting on the bullet, the push from the gun. The second, reaction force, is applied to the gun, not the bullet. Two forces acting on two different objects. No matter how hard a horse pulls on a cart, the cart must pull back with exactly the same force according to Newton’s Third Law. How can a cart pull a horse? (For this question assume that the horse and cart are on level ground.) The horse and cart pair are not what are working to make the motion. To move forward the horse must push against the ground, (action), and the ground then pushes against the horse (reaction). if the force is great enough to accelerate the horse, and attached cart, then they will accelerate forward. A bug splatters on a fast‐moving car’s windshield. How does the force felt by the bug compare to the force felt by the car’s windshield? Explain. The forces are exactly the same. Newton’s Third Law says that they must be. What happens because of these equal forces may be different, but nonetheless, the forces are equal.