Exam 3: Newtons Laws of Motion

A 10-kg block with an initial velocity of 10 m/s slides 10 m across a horizontal surface and comes to rest. It takes the block 2 s to stop. The stopping force acting on the block is about

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

We say that a force is a push or a pull. How does Newton's Third Law further define force?

A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground

Two people, one twice as massive as the other, attempt a tug-of-war with 12 m of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of

A skydiver steps from a helicopter and falls for 5 s before reaching her terminal velocity. During this 5-s interval, her acceleration

An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 m straight down in 1 s. On this planet, how much does the rock weigh?

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greatest force on the rope is exerted by

The maximum acceleration of a car while towing a second car twice its mass, compared to no towing, is

Place a small sheet of paper beneath a book and drop both simultaneously. They accelerate equally because the book pushes down on the paper. Now drop both with the paper on top of the book (but not sticking out beyond the edge of the book). Which has the greater acceleration? Why?

A ball thrown straight upward takes 10 s to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is

Two objects of the same size but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall, no tricks. You

An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s2. What is the mass of the car?

Two factors that greatly affect air resistance on falling objects are the size and

An apple weighs 1 N. When held at rest above your head, the net force on the apple is

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

Action and reaction forces comprise the parts of