Question 1

Which of the following is NOT considered a force according to the study materials?

Accepted Answer

Velocity

Question 2

A swimmer pushes backward on the water to propel herself forward. Which type of force is primarily responsible for her forward motion?

Accepted Answer

Thrust

Question 3

A car is driving on a very icy road and tries to turn, but continues in a straight line. Which law best explains this behavior?

Accepted Answer

Newton's first law

Question 4

Which of the following is a long-range force?

Accepted Answer

Weight (gravitational force)

Question 5

A box is at rest on a table. Which pair of forces are acting on the box?

Accepted Answer

Weight and normal force

Question 6

A 2 kg object is acted on by a net force of 10 N. What is its acceleration?

Accepted Answer

$$a = \frac{10}{2} = 5\ \mathrm{m/s^2$}$$

Question 7

Which of the following best describes the direction of the normal force?

Accepted Answer

Perpendicular to the surface

Question 8

A ball is rolling off a horizontal ramp. Which forces act on it just after it leaves the ramp (neglecting air resistance)?

Accepted Answer

Only the weight force acting downward

Question 9

A rope pulls a sled across snow. What is the direction of the tension force exerted by the rope on the sled?

Accepted Answer

Away from the sled, along the rope

Question 10

According to Newton's third law, when a swimmer pushes on the water, the water pushes back on the swimmer with:

Accepted Answer

A force of equal magnitude and opposite direction

Question 11

Two crewpersons pull a raft. Crewperson 1 pulls with $$130\ \mathrm{N} at$$ $$34^\circ$$ counterclockwise from the negative x-axis. Crewperson 2 pulls at $$45^\circ$$ from the negative x-axis. What force should Crewperson 2 apply so that the total force is in the positive x-direction?

Accepted Answer

$$130\ \mathrm{N} at$$ $$45^\circ$$ clockwise from the negative x-axis

Question 12

Which of the following is the correct mathematical expression for Newton's second law?

Accepted Answer

$$\sum \vec{F} = m \vec{a}$$

Question 13

A statue rests on the ground. Which of the following is an action-reaction pair according to Newton's third law?

Accepted Answer

The force of the statue on the ground and the force of the ground on the statue

Question 14

Which of the following best describes kinetic friction?

Accepted Answer

A force that opposes the motion of an object as it slides across a surface

Question 15

According to Newton's law of gravity, the gravitational force between two objects is:

Accepted Answer

Directly proportional to the product of their masses and inversely proportional to the square of the distance between them

Question 16

A sled is pushed across horizontal snow and then released. After the person jumps in, the sled gradually slows to a halt. Which forces act on the sledder-sled system just after she jumps in (neglecting air resistance)?

Accepted Answer

Weight, normal force, and kinetic friction

Question 17

If the net force on a box is in the positive x-direction, which of the following must be true?

Accepted Answer

The acceleration must be in the +x-direction

Question 18

Which of the following is the correct formula for the gravitational force between two masses $$m_1$$ and $$m_2$$ separated by a distance $$r$$?

Accepted Answer

$$F = G \frac{m_1$ m_2$}{r^2$}$$

Question 19

Planet X exerts a gravitational force on Planet Y. According to Newton's third law, the force of Planet Y on Planet X is:

Accepted Answer

The same as the force of Planet X on Planet Y

Question 20

A compressed spring exerts which type of force on an object?

Accepted Answer

A pushing force

Fundamentals of Forces and Newton's Laws: Study Notes

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