Question 1

Which of the following statements best describes the difference between kinematics and dynamics?

Accepted Answer

Kinematics describes motion without reference to its causes, while dynamics addresses the causes and changes in motion.

Question 2

A car travels 100 meters east, then 50 meters west. What is the car's displacement?

Accepted Answer

$$50\ \mathrm{m}$$\ east

Question 3

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 4

The slope of a position vs. time graph represents which physical quantity?

Accepted Answer

Velocity

Question 5

A ball is thrown vertically upward with an initial velocity of $$v_0 = 10$$\ \mathrm{m/s}$$. Neglecting air resistance, what is its velocity after 1.0$$\ \mathrm{s}$$? (Take g = 9.8$$\ \mathrm{$$m/s^2$$}$$ downward.)

Accepted Answer

$$0.2\ \mathrm{m/s}$$\ upward

Question 6

Which equation gives the instantaneous velocity $$v_x as a $$function of position $$x$$ and time $$t$$?

Accepted Answer

$$v_x = \frac{dx}{dt}$$

Question 7

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

Accepted Answer

$$10.0\ \mathrm{m/s}$$

Question 8

Which of the following is true about the acceleration of a freely falling object near Earth's surface?

Accepted Answer

It is always $$9.8\ \mathrm{m/s^2$}$$ downward, neglecting air resistance.

Question 9

A student throws a set of keys vertically upward to a friend in a window $$4.00\ \mathrm{m}$$ above. The keys are caught $$1.50\ \mathrm{s}$$ later. What was the initial velocity of the keys? (Use $$g = 9.8\ \mathrm{m/s^2$}$$ downward.)

Accepted Answer

$$6.6\ \mathrm{m/s}$$

Question 10

Which of the following best describes the meaning of negative acceleration?

Accepted Answer

The acceleration is in the direction opposite to the chosen positive axis.

Question 11

A ball starts from rest and accelerates at $$0.500\ \mathrm{m/s^2$}$$ down an inclined plane $$9.00\ \mathrm{m}$$ long. How long does it take to reach the bottom?

Accepted Answer

$$4.2\ \mathrm{s}$$

Question 12

Which of the following is NOT a simplification commonly made in introductory kinematics?

Accepted Answer

Objects are modeled as deformable solids and fluids.

Question 13

If the instantaneous velocity of an object is zero at a certain instant, which of the following must also be true?

Accepted Answer

The object's position is at a maximum or minimum if the velocity changes sign.

Question 14

A car travels at $$50\ \mathrm{mi/h}$$ for half an hour. What is its displacement during this time?

Accepted Answer

$$25\ \mathrm{miles}$$

Question 15

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

Accepted Answer

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

Question 16

On a position vs. time graph, what does the tangent to the curve at any point represent?

Accepted Answer

The instantaneous velocity at that point

Question 17

Which of the following is a correct interpretation of the average velocity between two points on a position-time graph?

Accepted Answer

It is the slope of the straight line connecting the two points.

Question 18

Which of the following is true about the units of the slope of a line on a position vs. time graph?

Accepted Answer

$$\mathrm{m/s}$$

Kinematics: Motion in One Dimension – Study Notes

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