Kinematics Concepts MC Review

1.

1 point

What is relative velocity?

It is the ratio of the objects' acceleration to the acceleration due to Earth's gravity

It is the velocity of the other object minus the velocity of the observer

It is the time between an event occurring and the point at which an observer may begin to take an action (such as braking)

It is the displacement divided by the time interval

2.

1 point

In the reaction time calculations we have performed, which of the following describes the motion of an object during the time interval that passes *before* the brakes are applied?

Speeding up

At rest

Slowing down

Moving with constant velocity

3.

1 point

Where in an object's motion is the velocity zero during free fall?

Always at the beginning of its motion, whether it is dropped or thrown

Always at the end of its motion, especially when it meets the ground

At the top of its motion, just for a split second

None of the above

4.

1 point

How many square feet are there in 27 square yards?

3

9

54

81

243

5.

1 point

What is defined to be "the velocity (speed and direction) of an object at a given moment in time"?

acceleration

average velocity

instantaneous velocity

relative velocity

6.

1 point

What is the *displacement* covered by a jogger who runs 4 miles east, 3 miles south, 2 miles east, and 3 miles north?

ANSWER: ____ miles, east

7.

3 points

What information can you conclude when you are told that an object is dropped? (Pick all that apply.)

It begins with zero velocity.

It begins with a negative velocity.

a = -9.8 m/s^2

Final velocity will be zero.

Displacement will be negative.

8.

1 point

Which of the following is NOT a unit of acceleration?

km / h sec

km / h^2 (kilometers per hour squared)

m / s

m / min^2 (meters per minuted squared)

All of these are units of acceleration

9.

1 point

What is the exponent when 0.000310 is put into proper scientific notation?

-3

-4

3

4

-7

10.

1 point

What is the S.I. (metric) unit for displacement?

kg

m/s^2 (meters per second squared)

s

m/s

m

11.

1 point

How many significant digits are there in this number? 20.020

1

5

4

2

3

12.

1 point

Ignoring air resistance, which of the following objects is in free fall?

Dropped tennis ball

Tennis ball thrown upward

Tennis ball hit downward

Bullet fired from a gun after leaving the gun's barrel

All of these

13.

1 point

Which of the following steps are *required* in showing your work in physics class?

Writing down symbols, values, units, and directions for all given information

Indicating which formula you are using, before plugging in values

Showing which values you insert for each variable in formula

Including units (and direction, if it applies) in your answer

All of the above

14.

1 point

Which of the following correctly describes the direction of the velocity and acceleration vectors when an object is thrown upward, at the instant just after it leaves the thrower's hand?

Velocity upward, acceleration upward

Velocity downward, acceleration downward

Velocity downward, acceleration upward

Velocity upward, acceleration zero

Velocity upward, acceleration downward

15.

1 point

TRUE or FALSE? When the velocity of an object in free fall has the same magnitude but the opposite direction as the initial velocity, it is at the same height as it began.

True

False

16.

1 point

Which of these are scalars? (Choose all that apply.)

acceleration

displacement

time

speed

velocity

distance

17.

1 point

What is the shape of a graph of a direct proportionality?

a downward opening parabola

an upward opening curve

a straight line with a nonzero y-intercept

a straight line through the origin

18.

1 point

What two things do you divide to find the average velocity?

total distance and total elapsed time

change in velocity and total elapsed time

displacement and total elapsed time

19.

1 point

Which of the following are vectors? (Choose all that apply.)

speed

distance

position

displacement

acceleration

20.

1 point

What is the MKS (standard metric) unit of acceleration?

kg

m/s

m/s^2 (meters per second squared)

m

s

21.

1 point

What is the conversion between cm and inches?

1 inch = 2.54 cm

2.54 inches = 1 cm

1 inch = 100 cm

1 inch = 5280 cm

22.

1 point

Which of the following accelerations would cause a car traveling at 35 mi/h west to slow down?

15 ft/sec^2 downward

15 ft/sec^2, west

15 ft/sec^2, east

0 ft/sec^2

23.

1 point

What types of motion does free fall include?

Objects dropped, acted upon by gravity alone

Objects thrown upward, provided there is no air resistance or contact with physical objects

Objects thrown sideways, if gravity is the only force acting on them

All of the above

24.

1 point

What is the *distance* covered by a jogger who runs 4 miles east, 3 miles south, 2 miles east, and 3 miles north?

ANSWER: ____ miles