Question 1

A car moves along a straight road and its position as a function of time is shown in the graph below (see $$image_2). $$Which of the following statements best describes the car's motion between $$t = 20$$ min and $$t = 30$$ min?

Accepted Answer

The car is stopped.

Question 2

Which equation correctly defines the average velocity $$v_x in $$terms of displacement $$\Delta x$$ and time interval $$\Delta t$$?

Accepted Answer

$$v_x = \Delta x / \Delta t$$

Question 3

A train travels 12 km in 10 minutes at a constant speed. How long will it take to travel 60 km at the same speed?

Accepted Answer

50 minutes

Question 4

The area under a velocity-versus-time graph between $$t_1$$ and $$t_2$$ represents:

Accepted Answer

The object's displacement during that interval.

Question 5

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

Accepted Answer

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

Question 6

A rock is dropped from rest from a cliff and falls $$100\ \mathrm{m}$$ before hitting the ground. Neglecting air resistance, how long does it take to reach the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.52\ \mathrm{s}$$

Question 7

Which of the following best describes the acceleration of an object in free fall near the Earth's surface?

Accepted Answer

It is always positive and points downward.

Question 8

A velocity-versus-time graph for an object is a straight line with a positive slope. What does this indicate about the object's motion?

Accepted Answer

The object is accelerating at a constant rate.

Question 9

A Boeing 747 accelerates at $$3.2\ \mathrm{m/s^2$}$$ from rest to a takeoff speed of $$70\ \mathrm{m/s}. $$What is the minimum length of runway required for takeoff?

Accepted Answer

$$766\ \mathrm{m}$$

Question 10

A springbok jumps straight up with an initial speed of $$7.0\ \mathrm{m/s}. $$How high does it rise? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.5\ \mathrm{m}$$

Question 11

Which of the following is true about the sign of acceleration?

Accepted Answer

Acceleration's sign depends on both the direction of motion and whether the object is speeding up or slowing down.

Question 12

If the velocity of an object is zero at an instant, what can you conclude about its acceleration at that instant?

Accepted Answer

The acceleration could be positive, negative, or zero.

Question 13

A car is moving to the left and slowing down. What is the direction of its acceleration?

Accepted Answer

To the right

Question 14

Which of the following is the correct kinematic equation for position with constant acceleration?

Accepted Answer

$$x = x_0$ + v_0$ t + \frac{1}{2} a t^2$

Question 15

A lion accelerates from rest at $$9.5\ \mathrm{m/s^2$}$$ for $$0.47\ \mathrm{s}. $$What speed does it reach?

Accepted Answer

$$4.5\ \mathrm{m/s}$$

Question 16

A car decelerates from $$15\ \mathrm{m/s} to $$rest in $$1.5\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

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

Question 17

Which of the following statements about free fall is correct?

Accepted Answer

All objects in free fall have the same acceleration regardless of mass.

Question 18

The slope of a position-versus-time graph at a specific point gives:

Accepted Answer

The object's instantaneous velocity at that point.

Question 19

A drag racer starts from rest and travels $$6.0\ \mathrm{m} in$$ $$1.0\ \mathrm{s}$$ with constant acceleration. How far will it travel in $$5.0\ \mathrm{s}$$?

Accepted Answer

$$150\ \mathrm{m}$$

Chapter 2: Motion in One Dimension – Structured Study Notes

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