FORCE AND LAW OF MOTION SECTION 3 REVIEWWW
Q22. Use Newtons laws to describe how inertia, gravity, and air resistance affect sky divers as they fall, open their parachutes, and reach terminal velocity.
A22. In Newton's Second Law it states that the objects acceleration is the force of gravity divided by the objects mass. Because of inertia and gravity, the skydiver first falls or accelerates down because of this and then once the sky diver opens the parachute, the sky diver falls at terminal velocity then make the velocity constant.
Q23.Discuss the advantages of wearing a safety belt when riding in a vehicle.
A23. The advantages of wearing a safety belt when riding in a vehicle is that you wont die or go through the cars windshield because if you were a safety belt it restrains you with the belt and cushioned air bag.
Q24. Explain why planets orbit the Sun instead of traveling off into space.
A24. The reason why planets orbit the Sun instead of traveling off into space is because of free fall, which is when only gravity is the force acting on an object. If the planets didn't have free fall or velocity perpendicular to the gravitational force, the planets would fall into the sun.
Q25. Describe what happens to the momentum of two billiard balls that collide.
A25. Newton's third law of motion describes what happens to the momentum of two billiard balls that collide. This is because Newtons third law of motion states that forces are equal in size and opposite in direction- so when the balls collide, the momentum of the first ball is lost and is gained by the second ball and the total momentum of the two balls are the same before and after the collision.
Q26. Explain how a rocket can move through outer space where there is no matter for it to push on.
A26. A rocket can move through outer space where there is no matter for it to push on is because the gases exert a force on the rocket and push it forward.
Q27. Suppose you are standing on a scale in an elevator that is accelerating upward. Will the scale read your weight as large or smaller than the weight it reads when you are stationary? Explain.
A27. If I were standing on a scale in an elevator that is accelerating upward, the scale would read as 0 because of the free fall and then when the elevator is stationary it would show my weight.
Q28. Calculate Momentum: A fuel- filled rocket is at rest. It burns its fuel and expels hot gas. The gas has a momentum of 1,500 kg x m/s backward. What is the momentum of the rocket?
A28. The momentum of the rocket would be 1,500 kgx m/s, this is because Newtons third law of motion states that forces are equal in size and opposite in direction.