Question 1

A runner jogs 3.0 km east, then turns around and runs 2.0 km west. What is the runner's displacement and total distance traveled?

Accepted Answer

Displacement: $$1.0\ \mathrm{km}$$ east; Distance: $$5.0\ \mathrm{km}$$

Question 2

Which of the following best describes the difference between average speed and average velocity?

Accepted Answer

Average speed is distance divided by time, while average velocity is displacement divided by time.

Question 3

A car travels 100 m north in 20 s, then 100 m south in 20 s. What is the car's average velocity and average speed for the entire trip?

Accepted Answer

Average velocity: $$0\ \mathrm{m/s}$$; Average speed: $$5.0\ \mathrm{m/s}$$

Question 4

Which of the following statements about instantaneous velocity is correct?

Accepted Answer

It is the slope of the tangent to the position vs. time graph at a given instant.

Question 5

A ball is dropped from rest from a height of $$20\ \mathrm{m}. $$Neglecting air resistance, how long does it take to reach the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 6

A car accelerates uniformly from $$10\ \mathrm{m/s} to$$ $$30\ \mathrm{m/s} in$$ $$5.0\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

$$4.0\ \mathrm{m/s^2$}$$

Question 7

A train moves with a constant acceleration of $$2.0\ \mathrm{m/s^2$}. If it $$starts from rest, how far does it travel in $$10\ \mathrm{s}$$?

Accepted Answer

$$100\ \mathrm{m}$$

Question 8

A car traveling at $$25\ \mathrm{m/s}$$ comes to a stop in $$5.0\ \mathrm{s}$$ with constant acceleration. What is the magnitude of its acceleration?

Accepted Answer

$$5.0\ \mathrm{m/s^2$}$$

Question 9

Which of the following is true about the motion of a freely falling object near Earth's surface (neglecting air resistance)?

Accepted Answer

It accelerates downward at approximately $$9.8\ \mathrm{m/s^2$}.$$

Question 10

A stone is thrown vertically upward with an initial velocity of $$15\ \mathrm{m/s}. $$How high does it rise? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$11.5\ \mathrm{m}$$

Question 11

A car moves in a straight line with a velocity given by $$v(t) = 4t$$, where $$v is in$$ $$\mathrm{m/s}$$ and $$t is in$$ $$\mathrm{s}. $$What is the car's acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 12

A person walks $$4.0\ \mathrm{km}$$ east, then $$3.0\ \mathrm{km}$$ west in $$2.0\ \mathrm{h}. $$What is the person's average velocity?

Accepted Answer

$$0.5\ \mathrm{km/h}$$\ east

Question 13

Which of the following best describes the acceleration of a car that is slowing down while moving in the positive x-direction?

Accepted Answer

The acceleration is negative.

Question 14

A ball is thrown straight up with a velocity of $$20\ \mathrm{m/s}. $$How long does it take to return to the thrower's hand? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.08\ \mathrm{s}$$

Question 15

A car starts from rest and accelerates at $$3.0\ \mathrm{m/s^2$}$$ for $$4.0\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$12\ \mathrm{m/s}$$

Question 16

A car travels at $$20\ \mathrm{m/s}$$ for $$5.0\ \mathrm{s}$$, then accelerates at $$2.0\ \mathrm{m/s^2$}$$ for another $$5.0\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$30\ \mathrm{m/s}$$

Question 17

A ball is dropped from a height $$h$$ and takes $$t$$ seconds to reach the ground. Which equation correctly relates $$h$$, $$g$$, and $$t$$?

Accepted Answer

$$h = \frac{1}{2}gt^2$

Question 18

A car moves with constant acceleration. Which of the following equations is NOT valid for this motion?

Accepted Answer

$$x = x_0$ + v_0$ t + a t^3$

Question 19

A ball is thrown downward from a building with an initial speed of $$5.0\ \mathrm{m/s}. $$How fast is it moving after $$2.0\ \mathrm{s}$$? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$24.6\ \mathrm{m/s}$$

One-Dimensional Kinematics: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard