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physics review > physics eview > Flashcards

physics eview Flashcards

1
Q

which of the following is an area of physics that studies motion and its causes?

A

Mechanics

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2
Q

Listening to your favorite radio station involves which area of physics?

A

Vibrations and wave phenomena

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3
Q

A baker makes a loaf of bread. Identify the area of physics that this involves.

A

thermodynamics

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4
Q

According to the scientific method, why does a physicist make observations and collect data?

A

To ask a question

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5
Q

In the steps of a scientific method, what is the next step after formulating and objectively testing hypotheses?

A

Interpreting results

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6
Q

Why do physicists use models?

A

to explain the basic features of a complex phenomena

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7
Q

Which statement about models is not correct?

A

models manipulate a single variable or factor in an experiment

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8
Q

what two dimensions, in addition to mass, are commonly used by physicists to derive additional measurements?

A

length and time

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9
Q

the symbol mm represents a

A

millimeter

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10
Q

the SI base unit used to measure mass is the

A

kilogram

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11
Q

the SI base unit for time is

A

1 second

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12
Q

A lack of precision in scientific measurements typically arise from

A

(double check this one) limitations of the measuring instrument

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13
Q

five darts strike near the center of a target. the dart thrower is

A

both precise and accurate

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14
Q

calculate the following and express the answer in scientific notation with the correct # of sig figs. 21.4 + 15 + 17.17+ 4.004

A

5.8 x 10^1

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15
Q

The Greek letter (Delta) indicates a (n)

A

in change

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16
Q

The most appropriate SI unit for measuring the length of an automobile is the

A

meter

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17
Q

estimate the order of magnitude of the length of a football field

A

10 ^2 meters

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18
Q

a hiker uses a compass to navigate through the woods. Identify the area of physics that this involves

A

electromagnetism

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19
Q

According to the scientific method, how does a physicist formulate and objectively test hypotheses

A

by experiments

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20
Q

Diagrams are not designed to

A

label parts of a model

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21
Q

The radius of Earth is 6 370 000 m. express this measurement in km in scientific notation with the correct # of sig figs

A

6.37 x 10^3

22
Q

three values were obtained for the mass of a metal bar 8.83 g, 8.84 g, 8,82 g. The known mass is 10.68 g. The values are

A

Precise

23
Q

Calculate the following, and express the answer in scientific notation with the correct # of sig figs. 10.5 x 8.8 x 3.14

A

2.9 x 10^2

24
Q

Calculate the following and express the answer in scientific notation with the correct # of sig figs. (0.82+0.042)(4.4 x 10^3)

A

3.8 x 10^3

25
Q

If the change in position is related to velocity in the equation x=Av, the constant A has which dimensions?

A

(double check) s

26
Q

what is the speed of an object at rest?

A

0.0 m/s

27
Q

which of the following situations represents a negative displacement. assume positive position is measured vertically upward along a y axis

A

a cat jumps from a tree limb to the ground

28
Q

which of the following units is the SI unit of velocity?

A

meter per second

29
Q

the slope of a line drawn tangent to a point on the curve of a position versus time graph describes what concept?

A

instantaneous velocity

30
Q

acceleration is defined as

A

the rate of change of velocity

31
Q

what is the SI unit of acceleration?

A

(m x s) ^2

32
Q

If you know a car’s acceleration, the information you must have to determine if the car’s velocity is increasing is the

A

direction of the car’s acceleration

33
Q

If you know the acceleration of a car and it’s initial velocity, you can predict which of the following?

A

the magnitude of the car’s final velocity (double check)

34
Q

When a car’s velocity is positive and its acceleration is negative, what is happening to the car’s motion?

A

the car slows down

35
Q

The motion of a ball on an inclined plane is described by the equation change in x = 1/2 a (change in time) ^2. This statement implies which of the following quantities has a value of zero?

A

initial velocity (double check)

36
Q

Acceleration due to gravity is also called

A

free-fall acceleration

37
Q

When there is no air resistance, objects of different masses dropped from rest

A

fall with equal accelerations and with equal displacements

38
Q

Objects that are falling toward Earth in free fall move

A

faster and faster

39
Q

Which would hit the ground first if dropped from the same height in a vacuum - a feather or a metal bolt?

A

They would hit the ground at the same time

40
Q

Which of the following is the equation for average velocity?

A

change in x / change in time

41
Q

During which interval is the cat at rest

A

5.0-10.0 s

42
Q

The cat has the fastest speed during which interval?

A

(double check) 10.0-15.0 s

43
Q

During which interval does the cat have the greatest positive velocity?

A

0.0-5.0 s

44
Q

When a car’s velocity is negative and its acceleration is negative, what is happening to the car’s motion?

A

the car speeds up

45
Q

A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At which point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?

A

At the top of its path

46
Q

Which of the following is a physical quantity that has magnitude but no direction?

A

scalar

47
Q

Which of the following is an example of a vector quantity?

A

Velocity

48
Q

In the figure above, which diagram represents the vector addition, C= A+B?

A

II

49
Q

Multiplying or dividing vectors by scalars results in

A

vectors

50
Q

In a coordinate system, a center is oriented at angle (theta) with respect to the x-axis. The x component of the vector equals the vector’s magnitude multiplied by which trigonometric function?

A

(double check) sin theta

51
Q

Which of the following is an example of projectile motion?

A

a baseball being trown

52
Q
A

physics review (1 decks)

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