Question 1

According to Newton's First Law, what will happen to an object in space (a frictionless environment) if no net force acts upon it?

Accepted Answer

It will continue moving at a constant velocity.

Question 2

A 2.0 kg ball is pushed so that it moves to the right at $$1.0\ \mathrm{m/s}^2. $$What is the magnitude and direction of the net force acting on the ball?

Accepted Answer

$$2.0\ \mathrm{N} to $$the right

Question 3

Which of the following best describes a free-body diagram?

Accepted Answer

A diagram showing only the forces acting on the object of interest.

Question 4

A 5.0 kg block slides to the right, slowing down from $$3.0\ \mathrm{m/s} to$$ $$1.0\ \mathrm{m/s} in$$ $$1.0\ \mathrm{s}. $$What is the net force acting on the block?

Accepted Answer

$$-10\ \mathrm{N}$$

Question 5

Which of the following is NOT a correct step when drawing a free-body diagram?

Accepted Answer

Include the forces acting on other objects in the system.

Question 6

A car is parked on a hill. Which of the following best represents the correct free-body diagram for the car (include only real forces, not components)?

Accepted Answer

Forces pointing straight down (gravity), perpendicular to the surface (normal), and up the hill (friction).

Question 7

Which of the following statements about the drag force is correct?

Accepted Answer

Drag force is significant for objects with a large cross-sectional area moving quickly through dense fluids.

Question 8

If a man pulls a rope tied to a heavy block on a rough floor, which of the following is NOT a force acting on the block?

Accepted Answer

Force exerted by the man on himself.

Question 9

Which equation correctly represents Newton's Second Law?

Accepted Answer

$$F = m a$$

Question 10

A 10 kg object is acted on by a net force of $$30\ \mathrm{N} to $$the right. What is its acceleration?

Accepted Answer

$$3.0\ \mathrm{m/s}^2 to $$the right

Question 11

Which of the following best explains why a ball rolling on a flat surface eventually stops, according to Newton's Laws?

Accepted Answer

Because friction provides a net force opposite to the motion.

Question 12

Which of the following is a correct statement of Newton's First Law?

Accepted Answer

An object maintains a constant velocity if there is no net force acting upon it.

Question 13

A 3.0 kg box is pulled to the left at a constant speed of $$2.0\ \mathrm{m/s}. $$What is the net force acting on the box?

Accepted Answer

$$0\ \mathrm{N}$$

Question 14

Which of the following is a non-contact force that should be included in a free-body diagram of a block on the floor?

Accepted Answer

Weight (gravitational force)

Question 15

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

Accepted Answer

The object is moving at a constant velocity.

Question 16

A 4.0 kg object is acted on by two forces: $$10\ \mathrm{N} to $$the right and $$6\ \mathrm{N} to $$the left. What is the acceleration of the object?

Accepted Answer

$$1.0\ \mathrm{m/s}^2 to $$the right

Question 17

Which of the following is the correct expression for the gravitational force acting on an object near Earth's surface?

Accepted Answer

$$F = m g$$

Question 18

When drawing a free-body diagram, which of the following is a common mistake to avoid?

Accepted Answer

Drawing the force of friction in the same direction as motion.

Question 19

A 1.0 kg object is moving in space (frictionless environment) at $$5.0\ \mathrm{m/s}. If no $$forces act on it, what will its velocity be after 10 seconds?

Accepted Answer

$$5.0\ \mathrm{m/s}$$

Question 20

Which of the following best describes the direction of the net force on an object?

Accepted Answer

It is in the direction of the object's acceleration.

Newton's Laws, Free-Body Diagrams, and Forces: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard