Question 1

Which of the following quantities is a vector?

Accepted Answer

Displacement

Question 2

A car travels 60 m east, then 60 m west, taking a total of 24 s. What is the car's average velocity?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 3

Which equation correctly relates average velocity, displacement, and time?

Accepted Answer

$$v_{avg} = \frac{\Delta x}{\Delta t}$$

Question 4

A baseball pitcher throws a ball at $$44\ \mathrm{m/s}$$ toward home plate, $$18.5\ \mathrm{m}$$ away. How long does it take the ball to reach home plate?

Accepted Answer

$$0.42\ \mathrm{s}$$

Question 5

Which of the following statements about acceleration is correct?

Accepted Answer

Acceleration is a vector and can be negative.

Question 6

A car slows from $$37.5\ \mathrm{m/s} to$$ $$25\ \mathrm{m/s}$$ with an acceleration of $$-4.6\ \mathrm{m/s^2$}. $$How long does this take?

Accepted Answer

$$2.72\ \mathrm{s}$$

Question 7

On a position-time graph, what does a horizontal (flat) segment represent?

Accepted Answer

The object is at rest.

Question 8

If the position-time graph is curved upward (smiley face), what can you say about the acceleration?

Accepted Answer

Acceleration is positive.

Question 9

Which of the following is the correct kinematic equation for displacement with constant acceleration?

Accepted Answer

$$\Delta x = v_0$ t + \frac{1}{2} a t^2$

Question 10

A car accelerates from $$5\ \mathrm{m/s} to$$ $$21\ \mathrm{m/s} at a $$constant $$3.0\ \mathrm{m/s^2$}. $$How far does it travel while accelerating?

Accepted Answer

$$78\ \mathrm{m}$$

Question 11

A rock is thrown upward with a speed of $$27.0\ \mathrm{m/s}$$ from the roof of a $$31.0\ \mathrm{m}$$ tall building. What is the speed of the rock just before it hits the street?

Accepted Answer

$$34.7\ \mathrm{m/s}$$

Question 12

Which of the following best describes the area under a velocity-time graph?

Accepted Answer

It represents the object's displacement.

Question 13

A police car at rest is passed by a speeder traveling at $$36\ \mathrm{m/s}. $$The police car accelerates at $$2.00\ \mathrm{m/s^2$}. $$How long does it take for the police car to catch up?

Accepted Answer

$$36\ \mathrm{s}$$

Question 14

Which of the following is true for an object in free fall (neglecting air resistance)?

Accepted Answer

The acceleration is $$-9.8\ \mathrm{m/s^2$}$$ downward.

Question 15

A moving hockey puck encounters a patch of rough ice and slides $$0.90\ \mathrm{m}$$ before stopping. If the deceleration is $$8\ \mathrm{m/s^2$}$$, what was the puck's initial speed?

Accepted Answer

$$3.8\ \mathrm{m/s}$$

Question 16

Which of the following is the correct equation for the final velocity of an object under constant acceleration?

Accepted Answer

$$v = v_0$ + a t$$

Question 17

A student throws keys vertically upward to a friend in a window $$14.0\ \mathrm{m}$$ above. The friend catches the keys $$1.50\ \mathrm{s}$$ later. What was the initial velocity?

Accepted Answer

$$15.2\ \mathrm{m/s}$$

Question 18

Which of the following statements about speed and velocity is correct?

Accepted Answer

Speed is always positive, velocity can be negative.

Question 19

If an object’s velocity and acceleration have opposite signs, what is happening to the object’s speed?

Accepted Answer

The speed is decreasing.

Motion Along a Straight Line: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드