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Exam 4: Newtons Laws of Motion

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Question 51

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A force is a vector quantity because it has both

A) mass and acceleration.
B) magnitude and direction.
C) action and reaction counterparts.

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Question 52

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A skydiver's terminal velocity will be greatest if she falls

A) lying flat on her back.
B) lying flat on her stomach.
C) with her parachute open.
D) head first.

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Question 53

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A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s2. The acceleration of a mass of 2 kg acted upon by a net force of 2 N is

A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is

A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass?

A 10-N falling object encounters 4 N of air resistance. The net force on the object is

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?

An object following a straight-line path at constant speed

The force required to maintain an object at a constant velocity in free space is equal to

The attraction of a person's body toward the Earth is called weight. The reaction to this force is

A 1-kg mass at the earth's surface weighs

A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was

A push on a 1-kg brick accelerates it. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with

A kilogram is a measure of an object's

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?

A falling skydiver of mass 100 kg experiences 500 N air resistance. The acceleration of the skydiver is

A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first?

If the mass of an object does not change, a constant net force on the object produces constant

A lightweight feather slides off a table and falls through the air until it reaches the floor. During the time of its fall,.its acceleration