Q: A box is being pulled by two ropes in different directions. If the forces are $$\vec{F}_1$$ and $$\vec{F}_2$$, what is the net force acting on the box?

$$\vec{F}_{\text{net}} = \vec{F}_1 + \vec{F}_2$$

Q: A skier is being towed up a snow-covered hill at constant speed. Which statement about the net force acting on the skier is correct?

The net force is zero, $$\vec{F}_{\text{net}} = 0.$$

Q: Which equation correctly represents Newton’s Second Law for an object of mass $$m$$ experiencing a net force $$\vec{F}_{\text{net}}$$?

$$\vec{F}_{\text{net}} = m \vec{a}$$

Question 1

Which of the following best describes a force according to the study materials?

Accepted Answer

A force is a push or a pull and is represented as a vector, $$\vec{F}.$$

Question 2

A box is being pulled by two ropes in different directions. If the forces are $$\vec{F}_1$$ and $$\vec{F}_2$$, what is the net force acting on the box?

Accepted Answer

$$\vec{F}_{	ext{net}} = \vec{F}_1 + \vec{F}_2$$

Question 3

Which of the following is an example of a long-range force?

Accepted Answer

Gravitational attraction between Earth and a falling apple

Question 4

A skier is being towed up a snow-covered hill at constant speed. Which statement about the net force acting on the skier is correct?

Accepted Answer

The net force is zero, $$\vec{F}_{	ext{net}} = 0.$$

Question 5

Which force always acts perpendicular to the surface of contact?

Accepted Answer

Normal force

Question 6

A ball rolls down an incline and leaves a horizontal ramp. Ignoring air resistance, what force(s) act on the ball as it moves through the air?

Accepted Answer

Only the weight of the ball acting vertically downward.

Question 7

A bobsledder pushes her sled across horizontal snow, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in?

Accepted Answer

Gravity, a normal force, and kinetic friction

Question 8

Which equation correctly represents Newton’s Second Law for an object of mass $$m$$ experiencing a net force $$\vec{F}_{	ext{net}}$$?

Accepted Answer

$$\vec{F}_{	ext{net}} = m \vec{a}$$

Question 9

A basketball is released from rest in a stiff breeze directed to the right. What is the direction of the ball’s acceleration immediately after release?

Accepted Answer

Downward, due to gravity

Question 10

An object is lowered by a rope at constant speed. Which statement is true about the tension in the rope?

Accepted Answer

The rope tension equals the object's weight.

Question 11

Which of the following is the correct free-body diagram for a ball tossed straight up just after it leaves the hand (ignoring air resistance)?

Accepted Answer

A single downward arrow representing the weight force.

Question 12

Which statement best describes Newton’s Third Law?

Accepted Answer

For every action, there is an equal and opposite reaction.

Question 13

A mosquito runs head-on into a truck. Which is true regarding the forces during the collision?

Accepted Answer

The mosquito exerts the same force on the truck as the truck exerts on the mosquito.

Question 14

If the net force on an object points to the left and two of three forces are shown, which direction must the third force point?

Accepted Answer

To the left

Question 15

Which of the following is true about friction forces?

Accepted Answer

Kinetic friction always opposes the direction of motion.

Question 16

A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam?

Accepted Answer

Gravity and tension in the cable

Question 17

Which of the following is the correct formula for the net force acting on an object when multiple forces are present?

Accepted Answer

$$\vec{F}_{	ext{net}} = \vec{F}_1 + \vec{F}_2 + \vec{F}_3 + \ldots$$

Question 18

Which of the following statements about acceleration is correct according to Newton’s Second Law?

Accepted Answer

Acceleration is directly proportional to net force and inversely proportional to mass.

Question 19

A car is parked on a hill. Which force keeps it from sliding down?

Accepted Answer

Static friction

Forces and Newton’s Laws of Motion – Study Notes

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학습 가이드 - 플래시카드