Q: If $$KE = 34.77\ \mathrm{kg\cdot m^2$/s^2$$}$$ and v = 5.5$$\ \mathrm{m/s}$$, what is the mass m$?

$$m = \frac{2 \times 34.77}{(5.5)^2$} = 2.30\ \mathrm{kg}$$

Q: A ball starts at $$+4\ \mathrm{m}$$ and rolls to the right with a velocity of $$+2.0\ \mathrm{m/s}. $$What is its position after $$3\ \mathrm{s}$$?

$$x = 4 + 2.0 \times 3 = 10\ \mathrm{m}$$

Question 1

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

Accepted Answer

Distance is the total length traveled regardless of direction, while displacement is the straight-line change in position with direction.

Question 2

A train travels 300 meters east in 20 seconds, then 400 meters west in 30 seconds. What is the magnitude of its average velocity?

Accepted Answer

$$\frac{100}{50} = 2\ \mathrm{m/s}$$

Question 3

Convert 550 grams to kilograms using the correct unit prefix.

Accepted Answer

$$0.55\ \mathrm{kg}$$

Question 4

Which of the following is the correct scientific notation for 0.0000467?

Accepted Answer

$$4.67 	imes 10$$^{-5}$$

Question 5

A cheetah sprints 100 meters in 4 seconds. What is its average speed?

Accepted Answer

$$25\ \mathrm{m/s}$$

Question 6

A car moves east at $$100\ \mathrm{km/h}$$ and passes another car moving west at $$100\ \mathrm{km/h}. $$What is the velocity of the westbound car relative to the eastbound car?

Accepted Answer

$$200\ \mathrm{km/h}$$

Question 7

Which of the following equations correctly solves for mass $$m in $$the kinetic energy formula $$KE = \frac{1}{2}mv^2$?

Accepted Answer

$$m = \frac{2KE}{v^2$}$$

Question 8

If $$KE = 34.77\ \mathrm{kg\cdot m^2$/s^2$$}$$ and v = 5.5$$\ \mathrm{m/s}$$, what is the mass m$?

Accepted Answer

$$m = \frac{2 	imes 34.77}{(5.5)^2$} = 2.30\ \mathrm{kg}$$

Question 9

A man drives his car with an average velocity of $$32.0\ \mathrm{m/s} to $$the east. How long will it take him to drive $$144,000\ \mathrm{m}$$?

Accepted Answer

$$\Delta t = \frac{144,000}{32.0} = 4,500\ \mathrm{s}$$

Question 10

Which of the following best describes instantaneous speed?

Accepted Answer

The speed at a specific moment in time.

Question 11

A ball starts at $$+4\ \mathrm{m}$$ and rolls to the right with a velocity of $$+2.0\ \mathrm{m/s}. $$What is its position after $$3\ \mathrm{s}$$?

Accepted Answer

$$x = 4 + 2.0 	imes 3 = 10\ \mathrm{m}$$

Question 12

Which unit prefix corresponds to a factor of $$10^{-9}$$?

Accepted Answer

nano

Question 13

A runner moves with an average velocity of $$1.2\ \mathrm{m/s}$$ south for $$570\ \mathrm{s}. $$What is the displacement?

Accepted Answer

$$684\ \mathrm{m}$$ south

Question 14

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

Accepted Answer

Velocity is a vector and speed is a scalar.

Question 15

A ball rolls on the floor with a velocity of $$2.5\ \mathrm{m/s} to $$the right. What is the equation of motion if it starts at $$x_i = 0$$?

Accepted Answer

$$x_f = 2.5t$$

Question 16

If a position vs. time graph has a slope of $$0$$, what does this indicate about the object's motion?

Accepted Answer

The object is at rest.

Question 17

Two runners start from the same point. Runner 1 moves at $$+1\ \mathrm{m/s}$$, Runner 2 at $$+2\ \mathrm{m/s}. $$How long until Runner 2 is $$6\ \mathrm{m}$$ ahead?

Accepted Answer

$$3\ \mathrm{s}$$

Question 18

Which of the following is the correct conversion of $$300\ \mathrm{m/s} to$$ $$\mathrm{cm/h}$$?

Accepted Answer

$$1,080,000,000\ \mathrm{cm/h}$$

Question 19

Which of the following best describes motion in 1D?

Accepted Answer

Motion along a straight line, described by a single coordinate.

Linear Motion: Speed, Velocity, and Position in One Dimension

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드