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FINALS ( im so cooked its not even funny) > Physics test > Flashcards

Physics test Flashcards

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1
Q

The rate at which an object moves is _____.

A

Speed

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2
Q

The rate at which velocity changes is ____________.

A

Acceleration

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3
Q

The fulcrum is between the input force and the load

A

First-Class Lever

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4
Q

The speed of an object in a particular direction is ________.

A

Velocity

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5
Q

When combining velocities that are going in opposite directions we

A

Subtract the smaller velocity from the larger one

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6
Q

What is the graph describing

A

Positive acceleration

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7
Q

A vehicle travels 3,000m in 250s toward the evening sun. What is its velocity?

A

12 m/s west

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8
Q

The tendency for all objects to resist a change in motion

A

Inertia

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9
Q

What is the acceleration of a car that goes from 50 m/s north to 75 m/s north in 5s?

A

5 m/s² north

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10
Q

What is the acceleration of a bike that goes from 64 m/s east to a stop in 4s?

A

-16 m/s² east

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11
Q

In 0.6 seconds, a projectile goes from 0 to 360 m/s south. What is the acceleration of the projectile?

A

600 m/s² south

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12
Q

A number that tells how many times a machine multiplies force.

A

Mechanical Advantage

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13
Q

If a car’s average speed is 30 km/hr, how far can it travel in 2 hours?

A

60km

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14
Q

The work output for a machine is always less than the work input because

A

of the effect of friction

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15
Q

A machine can increase _.

A

D

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16
Q

Which of the following statements about machines is true?

A

D

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17
Q

A comparison of a machine’s work output with the work input.

A

Mechanical efficiency

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18
Q

If you use a machine to increase the output force, what must also be true?

A

The distance over which the force is applied must increase.

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19
Q

Which of the following things is an example of a lever?

A

A DoorKnob

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20
Q

A property of moving objects that depends on the object’s mass and velocity.

A

Momentum

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21
Q

A wheelchair ramp on a building is an example of what type of simple machine?

A

Inclined Plane

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22
Q

A single fixed pulley will..

A

Change the direction of the force

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23
Q

What is the mechanical advantage of an inclined plane 6m long and .5m high?

A

12

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24
Q

What is the mechanical advantage of a wheel and axle with a wheel radius of 48cm and an axle diameter of 4cm?

A

24

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25
Q

The acceleration of an object depends on the mass of the object and the amount of force applied.

A

Newton’s 2nd law of motion

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26
Q

The load is between the fulcrum and the input force.

A

Second-Class Lever

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27
Q

What is a measure of gravitational force called?

A

Weight

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28
Q

A mechanical advantage greater than one means..

A

The outer force is greater than the input force

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29
Q

What is the velocity of a stone dropped from a cliff that takes 6 seconds to hit the ground?

A

58.8 m/s south

30
Q

A ball falls from a balcony and hits the ground with a velocity of 78.4 m/s down. How long does the ball fall?

A

8 seconds

31
Q

Fluid friction

A
32
Q

The constant velocity at which a falling object travels when the air resistance matches the force of gravity is called ________ ________.

A

Terminal Velocity

33
Q

An object at rest tends to stay at rest and an object in motion tends to stay in motion.

A

Newtons 1st Law of Motion

33
Q

Projectile motion is __________

A

The curved path of an object follows when thrown or propelled near the surface of the earth

34
Q

The input force is between the fulcrum and the load.

A

3rd Class-Lever

35
Q

Objects of different masses will fall at the same rate in a vacuum because of _______

A

Inertia

36
Q

For every action, there is an equal and opposite reaction is _______ ___ ___ __ ______.

A

Newtons 3rd law of Motion

37
Q

What force is necessary to accelerate a 1000kg box at a rate of 20 m/s/s?

A

20,000N

38
Q

What is the momentum of a 70kg athlete running 10 m/s?

A

700 kg m/s

39
Q

A change in pressure at any one point in an enclosed fluid will be transmitted equally to all parts of that fluid.

A

Pascals Principle

40
Q

Fluids floww…

A

to areas of higher pressure, i think

41
Q

Find the weight of a rock with an area of 2m² that exerts a pressure of 64 Pa.

A

128N

42
Q

Find the pressure exerted by a 3,600 N box with an area of 9m².

A

400 Pa

43
Q

The buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces.

A

Archimedes Principle

44
Q

As the speed of a moving fluid increases, its pressure decreases.

A

Bernoulli’s Principle

45
Q

The upward force of an object is caused by pressure differences.

A

Lift

46
Q

Planes with small wings need ____ ______

A

More Thrust

47
Q

An object will float if…

A

The buoyant force is equal to or greater than its weight

48
Q

When the buoyant force is greater than the object’s weight, the object will

A

Float

49
Q

Force is measured in __________

A

Newtons

50
Q

A push or a pull is A _____

A

Force

51
Q

What is the force of an object that is 25N up and 15N down?

A

10N

52
Q

All force has ____ and _________

A

Size and Direction

53
Q

An object will move when the force is __________.

A

Unbalanced

54
Q

Friction occurs when

A

All of the Above

55
Q

Rolling friction is..

A

The force that opposes the motion of objects moving across a surface on wheels, less than sliding friction.

56
Q

Friction can be increased by _________ ___ ______ _____ ________ _______.

A

Increasing the normal force between objects.

57
Q

Increasing the amount of surface contact between two objects will ________ ___ __________ _____..

A

Increase the frictional force

58
Q

Fluid between two surfaces will ______ _______.

A

Reduce Friction

59
Q

A man applies a force of 250N to push a box across the floor 5m. How much work does he do?

A

1250 Joules

60
Q

You lift a chair that weighs 60N to a height of 3m and carry it 5m across the room. How much work do you do on the chair?

A

180 Joules

61
Q

What is the power of a small motor that can do 2000 Joules of work in 20 seconds

A

100W

62
Q

How far was an 80N box pushed if 320 J of work was done?

A

4m

63
Q

In which situation do you do more work?

A

u better hope Chiara has Gauth AI lil bro

64
Q

Power is…

A

The rate at which work is done.

65
Q

Work is being done when

A

You exert a force that moves an object in the direction of the force.

66
Q

You and a friend together apply a force of 500N to a 1,000N car to make it roll 5m in 1 minute and 40 seconds. How much work did you and your friend do combined

A

2500 Joules

67
Q

You and a friend together apply a force of 500N to a 1,000N car to make it roll 5m in 1 minute and 40 seconds. What was your combined power?

A

25 Watts

68
Q

You apply 25N to a machine, and the machine applies 2,500N to an object. What is the mechanical advantage?

A

100

69
Q

What is the force of attraction between objects due to their masses?

A

Gravity

70
Q
A

FINALS ( im so cooked its not even funny) (1 decks)

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