Question 1

A car accelerates from rest at a constant rate of $$2.0\ \mathrm{m/s^2$}$$ for $$5.0\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$10\ \mathrm{m/s}$$

Question 2

Which of the following statements about acceleration is correct?

Accepted Answer

Acceleration is the rate of change of velocity.

Question 3

A bicyclist traveling at $$8.0\ \mathrm{m/s}$$ sees a stop sign and comes to a complete stop in $$4.0\ \mathrm{s}. $$What is the magnitude of the bicyclist's acceleration?

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 4

An object moves with constant velocity. Which of the following is true about its acceleration and position-versus-time graph?

Accepted Answer

Acceleration is zero; position-versus-time graph is linear.

Question 5

A rock is dropped from a cliff $$100\ \mathrm{m}$$ above the ground. 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

Which kinematic equation relates final velocity, initial velocity, acceleration, and displacement for constant acceleration?

Accepted Answer

$$(v_x)^2$ = (v_{x,0})^2$ + 2a_x \Delta x$$

Question 7

A rocket is launched straight up with a constant acceleration of $$18\ \mathrm{m/s^2$}$$ for $$150\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$2700\ \mathrm{m/s}$$

Question 8

An object is moving to the right and slowing down. What is the sign of its velocity and acceleration?

Accepted Answer

Velocity is positive, acceleration is negative.

Question 9

A ball is thrown vertically upward. Ignoring air resistance, what is the acceleration of the ball at its highest point?

Accepted Answer

$$-9.80\ \mathrm{m/s^2$}$$

Question 10

Which of the following best describes the area under a velocity-versus-time graph?

Accepted Answer

It represents the displacement of the object.

Question 11

A car traveling at $$15\ \mathrm{m/s}$$ comes to a stop in $$1.5\ \mathrm{s}$$ with constant acceleration. What is the car's acceleration?

Accepted Answer

$$-10\ \mathrm{m/s^2$}$$

Question 12

Which of the following is NOT a recommended step in the problem-solving approach described in the lecture?

Accepted Answer

Guess the answer before reading the problem.

Question 13

A feather and a hammer are dropped simultaneously on the Moon, where there is no air resistance. What happens?

Accepted Answer

They hit the ground at the same time.

Question 14

Which equation gives the position of an object under constant acceleration?

Accepted Answer

$$x = x_0$ + v_{x,0} t + \frac{1}{2} a_x t^2$

Question 15

A velocity-versus-time graph for an object with constant acceleration is:

Accepted Answer

A straight line with a nonzero slope.

Question 16

If an object is moving left and speeding up, what is the sign of its velocity and acceleration?

Accepted Answer

Both velocity and acceleration are negative.

Question 17

A student throws a ball straight up. At what point is the ball's velocity zero?

Accepted Answer

At the highest point of its trajectory.

Question 18

Which of the following is the correct SI unit for acceleration?

Accepted Answer

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

Question 19

A car travels $$11\ \mathrm{m} as it $$brakes to a stop from $$15\ \mathrm{m/s} in$$ $$1.5\ \mathrm{s}. $$Which kinematic equation is most appropriate to solve for the distance traveled?

Accepted Answer

$$x = x_0$ + v_{x,0} t + \frac{1}{2} a_x t^2$

Question 20

Which of the following is true about free-fall acceleration $$g on $$Earth?

Accepted Answer

$$g is $$always directed downward and has a magnitude of $$9.80\ \mathrm{m/s^2$}.$$

Kinematics: Motion, Velocity, and Acceleration (Lecture 3, Sections 2.4–2.7)

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