Physical Science Exam 1 (Chapters 1&2)

free fall

Motion that is happening under the influence of gravity only is known as: A. gravitational motion B. gravitational speed C. negative velocity D. free fall

natural

Motion that is straight up or down is known as A. natural B. violent C. force D. inertia

acceleration.

Newton's second law directly involves A. acceleration. B. speed. C. velocity. D. none of the above

inertia

The property of objects to resist changes in motion is known as A. force B. inertia C. acceleration D. static equilibrium

all of the above

The resistive force of friction occurs for A. solids. B. gases. C. liquids. D. all of the above

False

Weight and mass are the same quantities? A. True B. False

5 N east.

When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west with 15 N, the combination of these forces on the block is A. 5 N east. B. 35 N west. C. 5 N west. D. 35 N east

zero

When a falling object has reached its terminal velocity, its acceleration is A. zero B. constant C. g

inertia.

When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating A. ΣF = 0. B. friction. C. constant motion. D. inertia.

Two

When you stand at rest on a floor, the number of vertical forces acting on you is A. One B. Two C. Three D. Four E. Zero

pull of the ball's mass on Earth.

As a ball falls, the action force is the pull of Earth's mass on the ball. The reaction force is the A. air resistance acting against the ball. B. pull of the ball's mass on Earth. C. acceleration of the ball. D. nonexistent. E. none of the above

No

Do internal and external forces cancel each other out if two objects are not in the same system? A. Yes B. No

both a and b

Air resistance is dependent upon A. falling speed B. frontal area encounter by the air C. weight D. both a and b

50 N to the left.

A girl pushes a cart to the left with a 100-N force. A boy pushes it to the right with a 50-N force. The net force exerted on the cart is A. 100 N to the right. B. 50 N to the left. C. 50 N to the right. D. 100 N to the left.

be half.

A given net force propels an object along a straight-line path by a force. If the mass were doubled, its acceleration would A. be half. B. quadruple. C. stay the same. D. double. E. none of the above

Mass

A kilogram is a measure of an object's A. mass. B. weight. C. force. D. gravity.

all of the above

A motor scooter undergoes acceleration when it A. decreases speed. B. gains speed. C. changes direction. D. all of the above.

dynamic equilibrium.

A parachutist falling at constant velocity is in a state of A. non-dynamic equilibrium. B. dynamic equilibrium. C. being in and out of dynamic equilibrium. D. none of the above

ball against the bat.

A player hits a ball with a bat. If one part of the interaction is the bat against the ball, the other part is the A. ball against the bat. B. weight of the ball. C. grip of the player's hand against the ball. D. air resistance on the ball. E. none of the above

True

A scalar quantity is one that only has magnitude associated with it? A. True B. False

inversely

Acceleration is ______________ proportional to the mass of an object. A. directly B. inversely

an object at rest remains at rest unless acted upon by a net force.

According to Newton's First Law of Motion, A. an object at rest eventually begins to move. B. an object in motion moves in a parabolic trajectory unless acted upon by a net force. C. an object at rest remains at rest unless acted upon by a net force. D. an object in motion eventually comes to a halt. E. an object at rest always remains at rest.

a single interaction.

Action and reaction forces comprise the parts of A. two interactions. B. multiple interactions. C. a single interaction.

False

Air resistance allow objects to develop full acceleration due to gravity. A. True B. False

increases.

If an object's mass decreases while a constant force acts on it, the acceleration A. increases. B. will be zero. C. decreases. D. remains the same.

False

Mass and inertia have an inverse relationship. A. True B. False

Opposite

The force of friction acts in a direction _______ to the direction of motion of the object. A. same B. downward C. perpendicular D. opposite

True

The greater the mass an object has, the greater the inertia it possesses. A. True B. False

speed, velocity

_______ describes how fast something is going, whereas, _______ describes how fast something is going and in a certain direction. A. rate, velocity B. speed, velocity C. rate, speed D. speed, acceleration