Question 1

A car starts from rest and accelerates at $$4.0\ \mathrm{m/s^2$}$$ for $$3.0\ \mathrm{s}$$, then travels for $$20\ \mathrm{s} at a $$constant speed. How far does the car travel in total?

Accepted Answer

$$264\ \mathrm{m}$$

Question 2

Which of the following best describes the sign of acceleration when an object is moving in the positive direction and slowing down?

Accepted Answer

Acceleration is negative.

Question 3

A velocity vs. time graph for an object moving with constant negative acceleration is:

Accepted Answer

A straight line with negative slope.

Question 4

A particle moves to the left (negative direction) and is speeding up. What are the signs of its velocity and acceleration?

Accepted Answer

Velocity is negative, acceleration is negative.

Question 5

If the area under a velocity vs. time graph between $$t_1$$ and $$t_2 is$$ $$20\ \mathrm{m}$$, what does this area represent?

Accepted Answer

The displacement of the object.

Question 6

A runner is moving to the right and slowing down. Which of the following is true about the direction of velocity and acceleration?

Accepted Answer

Velocity is to the right, acceleration is to the left.

Question 7

An object moves with a constant acceleration $$a. $$Which equation correctly relates its velocity $$v at $$time $$t to $$its initial velocity $$v_0$$?

Accepted Answer

$$v = v_0$ + a t$$

Question 8

A cyclist is traveling at $$10\ \mathrm{m/s}$$ and comes to a stop in $$5\ \mathrm{s}$$ with constant acceleration. What is the acceleration?

Accepted Answer

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

Question 9

Which of the following statements about acceleration is correct?

Accepted Answer

Acceleration is the rate of change of velocity.

Question 10

A ball is thrown straight up 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

$$-4.8\ \mathrm{m/s}$$

Question 11

A motion detector records a velocity vs. time graph with a constant positive slope. What does this indicate about the object's motion?

Accepted Answer

The object is accelerating in the positive direction.

Question 12

A car is moving in the negative direction and slowing down. What is the sign of its acceleration?

Accepted Answer

Positive

Question 13

Which of the following is the correct operational definition of velocity?

Accepted Answer

Velocity is the rate of change of position.

Question 14

A position vs. time graph for an object with constant negative acceleration is:

Accepted Answer

A curve that opens downward.

Question 15

A car is traveling at $$20\ \mathrm{m/s}$$ and must stop in $$25\ \mathrm{m}. $$What is the minimum (constant) acceleration required to stop the car?

Accepted Answer

$$-8.0\ \mathrm{m/s^2$}$$

Question 16

If an object is moving to the left and slowing down, which of the following is true?

Accepted Answer

Velocity is negative, acceleration is positive.

Question 17

Which Logger Pro tool would you use to determine the acceleration from a velocity vs. time graph?

Accepted Answer

The Linear Fit tool

Question 18

A motion diagram shows an object with equally spaced dots and constant velocity to the right. What is the acceleration?

Accepted Answer

Zero

Question 19

A car accelerates from $$5\ \mathrm{m/s} to$$ $$25\ \mathrm{m/s} in$$ $$4\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

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

Question 20

Which of the following best describes the relationship between the sign of velocity and acceleration for an object that is speeding up?

Accepted Answer

Velocity and acceleration have the same sign.

Constant Acceleration and Motion Analysis (PHYS 2011: Day 6)

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