Question 1

According to Galileo's experiments at the Leaning Tower of Pisa, what happens when two objects of different masses are dropped from the same height in the absence of air resistance?

Accepted Answer

Both objects land at the same time because acceleration due to gravity is independent of mass.

Question 2

A ball rolls down an inclined plane and its speed increases. According to Galileo, what would happen to the ball's speed if it rolled on a perfectly horizontal surface with no friction?

Accepted Answer

Its speed would remain constant.

Question 3

Which of the following best describes Newton's First Law of Motion?

Accepted Answer

An object will remain at rest or in uniform motion in a straight line unless acted on by a nonzero net force.

Question 4

A box is pulled to the right with a force of $$5\ \mathrm{N}$$ and to the left with a force of $$10\ \mathrm{N}. $$What is the net force acting on the box?

Accepted Answer

$$5\ \mathrm{N} to $$the left

Question 5

Which of the following is a vector quantity?

Accepted Answer

Force

Question 6

Two forces of $$5\ \mathrm{N}$$ each act on an object in the same direction. What is the net force?

Accepted Answer

$$10\ \mathrm{N}$$

Question 7

If two vectors of $$30\ \mathrm{N}$$ and $$40\ \mathrm{N}$$ act at right angles to each other, what is the magnitude of their resultant vector?

Accepted Answer

$$50\ \mathrm{N}$$

Question 8

A person stands on two bathroom scales with one foot on each, distributing their weight evenly. If the person weighs $$800\ \mathrm{N}$$, what does each scale read?

Accepted Answer

$$400\ \mathrm{N}$$

Question 9

A crate is pushed at a steady speed in a straight line across a floor. If the friction force is $$75\ \mathrm{N}$$, how much force must you apply to keep it moving at constant speed?

Accepted Answer

Equal to $$75\ \mathrm{N}$$

Question 10

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium can be moving at constant velocity.

Question 11

A book rests on a table. Which force is responsible for supporting the book against gravity?

Accepted Answer

Support force (normal force)

Question 12

You are riding in a train moving at constant velocity and toss a coin straight up. Where does the coin land?

Accepted Answer

In your hand

Question 13

Which of the following is NOT a scalar quantity?

Accepted Answer

Acceleration

Question 14

A painter stands on a platform supported by two ropes. If the sum of the upward forces equals the sum of the downward forces, what is the net force on the system?

Accepted Answer

Zero

Question 15

Which of the following best describes inertia?

Accepted Answer

A property of matter that resists changes in motion

Question 16

A hockey puck slides at constant speed on frictionless ice. What is the net force acting on the puck?

Accepted Answer

Zero

Question 17

If a rope supports a person hanging in equilibrium, and the rope splits into two branches at different angles, which side has the greater tension?

Accepted Answer

The side with the smaller angle to the vertical

Question 18

Which of the following is an example of dynamic equilibrium?

Accepted Answer

A hockey puck sliding at constant speed on ice

Question 19

If the net force acting on an object is zero, which of the following must be true?

Accepted Answer

The object is moving at constant velocity or at rest.

Question 20

A person pushes a box across the floor at a constant speed. Which statement is true about the forces acting on the box?

Accepted Answer

The applied force is equal to the friction force.

Newton's First Law of Motion—Inertia: Foundations, Forces, and Equilibrium

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