Question 1

A car moves along a straight road. Its position-versus-time graph is a curve that becomes steeper as time increases. What does this indicate about the car's motion?

Accepted Answer

The car is speeding up.

Question 2

Which of the following best describes the instantaneous velocity at time $$t$$?

Accepted Answer

The slope of the position-versus-time graph at time $$t.$$

Question 3

A ball is thrown straight up. At the very top of its trajectory, what are the values of its velocity $$v_y$$ and acceleration $$a_y$$?

Accepted Answer

$$v_y is $$zero, $$a_y is$$ $$-9.8\ \mathrm{m/s^2$}.$$

Question 4

Which equation gives the displacement $$\Delta s of an $$object moving with constant acceleration $$a$$ and initial velocity $$v_i$$ over a time interval $$\Delta t$$?

Accepted Answer

$$\Delta s = v_i \Delta t + \frac{1}{2} a (\Delta t)^2$

Question 5

A drag racer starts from rest and accelerates uniformly. The velocity-versus-time graph is a straight line from $$(0, 0) to$$ $$(3.0\ \mathrm{s}, 16\ \mathrm{m/s}). $$What is the total displacement after 3.0 s?

Accepted Answer

$$18\ \mathrm{m}$$

Question 6

A passenger in a hot air balloon rising at $$8\ \mathrm{m/s}$$ drops a sandbag. Neglecting air resistance, what is the initial velocity of the sandbag just after release?

Accepted Answer

$$8\ \mathrm{m/s}$$\ upward

Question 7

Which of the following is the correct expression for average acceleration $$a_{avg}$$ over a time interval $$\Delta t$$?

Accepted Answer

$$a_{avg} = \frac{\Delta v}{\Delta t}$$

Question 8

A ball rolls up a ramp, stops, and then rolls back down. What does its acceleration-versus-time graph look like (ignoring friction)?

Accepted Answer

A constant negative value throughout.

Question 9

An object is moving with constant velocity. Which of the following statements is true?

Accepted Answer

Its position-versus-time graph is a straight line.

Question 10

A springbok antelope accelerates at $$35\ \mathrm{m/s^2$}$$ for $$0.70\ \mathrm{s}$$ from rest. What is its final velocity?

Accepted Answer

$$24.5\ \mathrm{m/s}$$

Question 11

Which of the following best describes the area under a velocity-versus-time graph between $$t_1$$ and $$t_2$$?

Accepted Answer

The object's displacement during that interval.

Question 12

A ball is dropped from rest from a tall building. Neglecting air resistance, which of the following is true about its motion?

Accepted Answer

Its acceleration is constant and equal to $$9.8\ \mathrm{m/s^2$}$$ downward.

Question 13

An object slides down a frictionless inclined plane at angle $$	heta. $$What is the acceleration along the incline?

Accepted Answer

$$a = g \sin 	heta$$

Question 14

A car slows down while moving away from the origin. What does its velocity-versus-time graph look like?

Accepted Answer

A line with negative slope above the time axis.

Question 15

Which of the following is the correct kinematic equation relating final velocity $$v_f$$, initial velocity $$v_i$$, acceleration $$a$$, and displacement $$\Delta s$$ for constant acceleration?

Accepted Answer

$$v_f^2$ = v_i^2$ + 2a \Delta s$$

Question 16

A position-versus-time graph has a negative slope. What does this indicate about the object's motion?

Accepted Answer

The object is moving in the negative direction.

Question 17

If the velocity of an object is not constant, how can you determine its displacement between $$t_1$$ and $$t_2$$?

Accepted Answer

By finding the area under the velocity-versus-time curve between $$t_1$$ and $$t_2.$$

Question 18

A ball is thrown downward from a tall building with an initial speed of $$5\ \mathrm{m/s}. $$What is its velocity after $$2\ \mathrm{s}$$? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

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

Kinematics: Motion in One Dimension (Physics 1, Chapter 2)

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