Question 1

A car moves along a straight road such that its position-versus-time graph is a straight line with a positive slope. Which of the following statements is true about the car's motion?

Accepted Answer

The car is moving with constant velocity in the positive direction.

Question 2

Which of the following best describes the difference between distance and displacement?

Accepted Answer

Distance is a scalar quantity representing the total path length, while displacement is a vector quantity representing the straight-line change in position.

Question 3

A runner starts at $$x = 0 m $$and runs to $$x = 100 m in 10 s$$, then immediately turns around and runs back to $$x = 40 m in 5 s. $$What is the runner's average velocity for the entire trip?

Accepted Answer

$$2.67 m/s$$

Question 4

Which of the following equations correctly gives the final position $$s_f of an $$object moving with constant velocity $$v$$ over a time interval $$\Delta t$$ from an initial position $$s_i$$?

Accepted Answer

$$s_f = s_i + v \Delta t$$

Question 5

A ball is thrown straight up with an initial velocity of $$+15 m/s. $$What is the ball's velocity at its highest point?

Accepted Answer

$$0 m/s$$

Question 6

A car accelerates uniformly from rest to a velocity of $$20 m/s in$$ $$5$$ seconds. What is the car's acceleration?

Accepted Answer

$$4$$ $$m/s^2$

Question 7

Which of the following statements about free fall is correct (neglecting air resistance)?

Accepted Answer

All objects fall with the same acceleration regardless of their mass.

Question 8

A stone is dropped from rest from a cliff and falls freely under gravity. Which kinematic equation would you use to find the time it takes to reach the ground if the height $$h is $$known?

Accepted Answer

$$h = v_i t + \frac{1}{2} a t^2$

Question 9

A cyclist travels 200 m north, then 150 m south. What is the magnitude of the cyclist's displacement?

Accepted Answer

$$50 m$$

Question 10

A position-versus-time graph for an object is a curve that gets steeper as time increases. What does this indicate about the object's motion?

Accepted Answer

The object is speeding up.

Question 11

A car moves with a constant acceleration of $$-3 m/s$^2. If $$its initial velocity is $$12 m/s$$, how long will it take to come to rest?

Accepted Answer

$$4 s$$

Question 12

Which of the following is the correct expression for instantaneous velocity $$v in $$terms of position $$s$$ and time $$t$$?

Accepted Answer

$$v = \frac{ds}{dt}$$

Question 13

A ball is thrown vertically upward. At the very top of its trajectory, which of the following is true?

Accepted Answer

The velocity is zero, but the acceleration is $$-9.8 m/s$^2.$$

Question 14

A motion diagram shows dots equally spaced along a straight line. What does this indicate about the object's motion?

Accepted Answer

The object is moving at constant velocity.

Question 15

A car starts from rest and accelerates at $$2 m/s$^2$$ for $$6$$ seconds. What is its final velocity?

Accepted Answer

$$12 m/s$$

Question 16

A rock is thrown downward from a bridge with an initial velocity of $$5 m/s. $$How fast is it moving after $$2$$ seconds? (Assume $$g = 9.8 m/s$^2$$ downward.)

Accepted Answer

$$24.6 m/s$$

Question 17

A position-versus-time graph has a negative slope. What does this tell you about the object's velocity?

Accepted Answer

The object is moving in the negative direction.

Question 18

A springbok antelope leaps vertically upward with an initial velocity of $$10 m/s. $$How high does it rise? (Use $$g = 9.8 m/s$^2.)$$

Accepted Answer

$$5.1 m$$

Question 19

A sandbag is dropped from a hot air balloon rising at $$8 m/s. $$Immediately after release, what is the sandbag's velocity relative to the ground?

Accepted Answer

$$8 m/s$ upward

Question 20

Which of the following best describes the acceleration of an object in free fall near Earth's surface?

Accepted Answer

$$a = 9.8 m/s$^2$$ downward

Kinematics and Motion: Study Notes for Physics 1 (PCS 120)

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드