Q: A car travels 100 m east, then 50 m west. What is the car's displacement?

$$50\ \mathrm{m}\ \text{east}$$

Question 1

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 2

A car travels 100 m east, then 50 m west. What is the car's displacement?

Accepted Answer

$$50\ \mathrm{m}\ 	ext{east}$$

Question 3

Which equation correctly defines average velocity?

Accepted Answer

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

Question 4

A runner accelerates from rest to $$8\ \mathrm{m/s} in$$ $$4\ \mathrm{s}. $$What is the runner's average acceleration?

Accepted Answer

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

Question 5

Which of the following best describes a scalar quantity?

Accepted Answer

A quantity with only magnitude

Question 6

A cyclist moves at a constant velocity of $$5\ \mathrm{m/s}$$ for $$20\ \mathrm{s}. $$What is the total displacement?

Accepted Answer

$$100\ \mathrm{m}$$

Question 7

Which of the following statements about reference frames is correct?

Accepted Answer

An observer at rest or moving at constant velocity is in an inertial reference frame.

Question 8

A train moves at $$30\ \mathrm{m/s}$$ east relative to the ground. A passenger walks at $$2\ \mathrm{m/s}$$ east inside the train. What is the passenger's velocity relative to the ground?

Accepted Answer

$$32\ \mathrm{m/s}$$\ east

Question 9

Which graph best represents an object moving with constant acceleration?

Accepted Answer

A velocity vs. time graph with a straight, sloped line

Question 10

A ball is thrown straight up with an initial velocity of $$10\ \mathrm{m/s}. $$What is its velocity after $$1\ \mathrm{s}$$? (Assume $$g = 9.8\ \mathrm{m/s^2$}$$ downward)

Accepted Answer

Question 11

Which of the following is NOT a correct representation of motion?

Accepted Answer

Temperature vs. time graph

Question 12

A car starts from rest and accelerates at $$3\ \mathrm{m/s^2$}$$ for $$5\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$15\ \mathrm{m/s}$$

Question 13

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

Accepted Answer

Displacement has direction; distance does not.

Question 14

A person walks $$3\ \mathrm{km}$$ north, then $$4\ \mathrm{km}$$ east. What is the magnitude of their displacement?

Accepted Answer

$$5\ \mathrm{km}$$

Question 15

Which of the following scenarios involves a change in velocity but not in speed?

Accepted Answer

A car turning a corner at constant speed

Question 16

An observer in a moving car measures a stationary tree outside. What is the velocity of the tree relative to the observer?

Accepted Answer

Equal to the car's velocity but in the opposite direction

Question 17

A student throws a ball straight up with velocity $$v_0. $$Which equation gives the ball's velocity after time $$t$$? (Assume downward acceleration $$g)$$

Accepted Answer

$$v = v_0$ - gt$$

Question 18

A car moves at $$20\ \mathrm{m/s}$$ for $$10\ \mathrm{s}$$, then at $$30\ \mathrm{m/s}$$ for $$5\ \mathrm{s}. $$What is the average velocity over the $$15\ \mathrm{s}$$?

Accepted Answer

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

Question 19

Which of the following is true about acceleration?

Accepted Answer

Acceleration can be negative.

Scalars, Vectors, and Motion in One Dimension

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