Question 1

A car moves along a straight road. Its position-versus-time graph is a straight line with a positive slope. What does this indicate about the car's motion?

Accepted Answer

The car is moving with constant velocity.

Question 2

Which of the following equations correctly relates displacement $$\Delta x to $$velocity $$v_x$$ and elapsed time $$\Delta t$$ for uniform motion?

Accepted Answer

$$\Delta x = v_x \Delta t$$

Question 3

A skier slows from $$8.0\ \mathrm{m/s} to$$ $$6.0\ \mathrm{m/s}$$ over a distance of $$50\ \mathrm{m}. $$What is the magnitude of the skier’s acceleration?

Accepted Answer

$$2.8\ \mathrm{m/s^2$}$$

Question 4

Which of the following best describes the instantaneous velocity of an object at a specific instant?

Accepted Answer

The velocity at a specific instant of time.

Question 5

A rock is dropped from rest from a height of $$100\ \mathrm{m}. $$Ignoring air resistance, how long does it take to reach the ground? (Use $$g = 9.80\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.52\ \mathrm{s}$$

Question 6

At the very highest point of its trajectory, what is the instantaneous acceleration of a ball tossed straight up?

Accepted Answer

Negative

Question 7

Which of the following is the correct definition of acceleration in terms of velocity and time?

Accepted Answer

$$a_x = \frac{\Delta v_x}{\Delta t}$$

Question 8

A car’s velocity changes from $$20\ \mathrm{m/s} to$$ $$10\ \mathrm{m/s} in$$ $$5\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

$$-2\ \mathrm{m/s^2$}$$

Question 9

Which statement about free-fall acceleration is correct?

Accepted Answer

It always points downward, regardless of the object's motion.

Question 10

A car travels $$400\ \mathrm{mi} at$$ $$50\ \mathrm{mi/h}$$, while another car travels the same distance at $$60\ \mathrm{mi/h}$$ but starts $$4$$ hours later. How long does the faster car have to wait for the slower car to arrive?

Accepted Answer

$$20$$ minutes

Question 11

On a position-versus-time graph, what does the slope at any point represent?

Accepted Answer

The object's instantaneous velocity at that point.

Question 12

A particle is slowing down while moving in the negative direction. What are the signs of its velocity and acceleration?

Accepted Answer

Velocity negative, acceleration positive

Question 13

Which kinematic equation is appropriate for finding the final velocity $$v_f of an $$object under constant acceleration $$a$$ after time $$t$$, starting from initial velocity $$v_i$$?

Accepted Answer

$$v_f = v_i + a t$$

Question 14

A ball is thrown vertically upward with an initial velocity of $$15\ \mathrm{m/s}. $$What is its velocity after $$2\ \mathrm{s}$$? (Assume $$g = 9.8\ \mathrm{m/s^2$}$$ downward)

Accepted Answer

Question 15

The area under a velocity-versus-time graph between $$t_1$$ and $$t_2$$ represents:

Accepted Answer

The object's displacement during that interval.

Question 16

If an object is thrown upward and returns to its starting point, ignoring air resistance, what is true about its acceleration during the entire flight?

Accepted Answer

It is always $$-9.8\ \mathrm{m/s^2$}$$ downward.

Question 17

A student walks $$200\ \mathrm{m} to $$the right of the origin, then $$100\ \mathrm{m} to $$the left. What is the student's final position relative to the origin?

Accepted Answer

$$100\ \mathrm{m} to $$the right

Question 18

Which of the following is true for uniform motion?

Accepted Answer

The position-versus-time graph is a straight line.

Motion in One Dimension: Study Notes for College Physics

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드