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final reviews:(( > physics > Flashcards

physics Flashcards

1
Q

What is centripetal force?

A

The inward force (toward the center of the circle) that causes an object to change direction.

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2
Q

What direction does centripetal force always point?

A

Inward, toward the center

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3
Q

Velocity is a vector quantity, meaning it has _______ and ________

A

magnitude__ and __direction

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4
Q

In circular motion, the __magnitude__ is now constant, while ________ changes

A

direction

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5
Q

As clothes spin in a washing machine, they experience a force ________

A

inward

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6
Q

If the washing machine had a vertical drum, the clothes would feel the heaviest

A

at the bottom

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7
Q

As radius increases, centripetal acceleration ______ and centripetal force _______

A

both decrease

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8
Q

As speed increases, centripetal acceleration ______ and centripetal force _______

A

both increase

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9
Q

Centripetal force is directly proportional to the square of the speed, __ directly __ proportional to the mass, and ______ porportional to the radius/distance

A

inversely

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10
Q

Lifeguard whistle being swung in a circle.

A

tension in the lanyard

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11
Q

Moon orbiting around the Earth.

A

gravity

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12
Q

Car going around a curve.

A

friction between tires and road __

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13
Q

Mrs Tolmich waving her scarf in a circle at the ATL UTD game.

A

tension in arms and scarf__

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14
Q

Loop on a roller coaster.

A

normal force between track and train __

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15
Q

If the distance increases by a factor of 10, how will the centripetal force change?

A

decreases by 1/10

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16
Q

If the speed increases by a factor of 10, how will the centripetal force change?

A

increases by 100

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17
Q

If the speed and the distance increase by a factor of 10, how will the centripetal force change?

A

increases by 10

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18
Q

What is the centripetal acceleration exerted on an object moving 5 m/s around a circle of radius 1.0m?

A

25 m/s2

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19
Q

A 0.24kg whistle is on a 0.45m lanyard. If it is spinning over a lifeguard’s head at 3.7m/s, what is the centripetal force holding the whistle in the circle?

A

7.3 N

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20
Q

An object is swung in a circle of radius 0.7 m. If it spins at a rate of 7m/s, what is the centripetal acceleration experienced by the object?

A

70

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21
Q

What is the force experienced by a 1000 kg car going 22 m/s around Spaghetti Junction (bridge turn radius of 305 m)

A

1586.9 N

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22
Q

What is gravitational force

A

An attractive force between two masses

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23
Q

as distance increase, the gravitional force…

A

decreases

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24
Q

as mass increase, the g force…..

A

increases

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25
Q

Gravitational force is ___directly_____ proportional to the masses and ______inversely______________ proportional to the ______square__________ of the distance.

A

Gravitational force is ___directly_____ proportional to the masses and ______inversely______________ proportional to the ______square__________ of the distance.

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26
Q

If the distance increases by a factor of 10, how will the gravitational force change?

A

Decreases by 1/100

27
Q

If the mass of one of the objects increases by a factor of 10, how will the gravitational force change

A

Increases by 10

28
Q

If one mass and the distance increase by a factor of 10, how will the gravitational force change?

A

Decreases by 1/10

29
Q

If the distance changes by a factor of 1/3, how will the gravitational force change?

A

Increases by 9

30
Q

If both masses and the distance change by a factor of 1/3, how will the gravitational force change?

A

Does not change, or “changes by 1”

31
Q

If an object weighs 100 N on earth, what will the new weight be if the earth doubles in mass?

A

It would be double the original weight, so 200 N

32
Q

If an object weighs 100 N on earth, what will the new weight be if the earth’s radius doubles?

A

It would be ¼ of the original weight, so 25 N

33
Q

Vector

A

Vector-quantity with both magnitude and direction

34
Q

Scalar

A

Scalar-quantity with magnitude but no direction

35
Q

Distance s or v

A

s

36
Q

displacement s or v

A

v

37
Q

speed s or v

A

s

38
Q

velocity s or v

A

v

39
Q

accerleration s or v

A

v

40
Q

force s or v

A

v

41
Q

mass s or v

A

s

42
Q

weight s or v

A

v

43
Q

A person drives 100 km in 1.2 hours and 80 km in 0.9 hours. What was the average velocity for the drive?

A

85.71

44
Q

constant PT

A

straight

45
Q

accelerating PT

A

curved

46
Q

constant VT

A

horizontal line

47
Q

accelerating VT

A

straight diagonal

48
Q

For a projectile, which velocity remains constant throughout the time of flight?

A

Vx

49
Q

For a projectile, which velocity includes an acceleration?

A

Vy

50
Q

Which direction, horizontal or vertical, affects time

A

vertical

51
Q

Are the vertical and horizontal directions dependent or independent of each other

A

independent

52
Q

State Newton’s First Law

A

An object at rest stays at rest and an object in motion stays in motion at a constant velocity (in a straight line) unless acted on by an outside (unbalanced) force.

53
Q

No matter the location, objects always have constant ___mass___, but location (altitude, which planet, space, etc.) changes the object’s ____weight_________.

A

No matter the location, objects always have constant ___mass___, but location (altitude, which planet, space, etc.) changes the object’s ____weight_________.

54
Q

What formula is associated with Newton’s Second law?

A

Fnet = ma

55
Q

How are acceleration and force related? _____ porportional

A

directly

56
Q

How are acceleration and mass related? _____ porportional

A

inversely

57
Q

What are the two situations for an object to have a net force of zero?

A

the object is either at rest or moving at a constant velocity.

58
Q

What do you know about the values of the vertical forces?

A

They are balanced since it is on a surface.

59
Q

If the object has a positive acceleration, what do you know about the horizontal forces?

A

The force to the right has to be larger than the force to the left

60
Q

State Newton’s Third Law.

A

For every action there is an equal and opposite reaction.

61
Q

Define work

A

the amount of energy it takes to move an object.

62
Q

power

A

the rate at which work is done.

63
Q

All of the energy in a system is determined by

A

the amount of _____total_____ energy in the beginning.

final reviews:(( (3 decks)

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