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BISI Midterm 2 > All Midterm 2 Content > Flashcards

All Midterm 2 Content Flashcards

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1
Q

What is inertia?

A

Propert Of Matter To Resist Changes Ij Motion (Also Depends On Amount Of Matter)

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2
Q

What is mass?

A

Measure of the inertia of a material object Greater Inertia= Greater Mass. Independent Of Gravity (Unit Of Mea. Is Kg)

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3
Q

What is weight?

A

The force of an object due to gravity. Scientific unit of force is Newton. Unit is also the (Ib)

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4
Q

If the mass of an object is halved the weight of the object is?

A

Halved

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5
Q

Which planet exerts less weight on an object ? Moon Or Earth?

A

Moon

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6
Q

Which Planet Exerts More Mass On An Object? Moon Or Earth?

A

Same

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7
Q

How Much Does One Kg weigh?

A

9.8 Newtons

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8
Q

How Much Is 1 Ib In Newtons?

A

4.45

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9
Q

What Is Netforce?

A

The Combination Of All Forces That Change An Objects State of motion

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10
Q

What is a force?

A

A push or a pull

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11
Q

Calculate netforce if two people are moving a couch to the right 20 N and the other is moving 20 N left.

A

Zero N

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12
Q

A cart is pushed to the right with a force of 15 N while being pulled to the left with a force of 20 N. The net force on the cart is

A

5 N to the left.

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13
Q

What is Vector quantity

A

a quantity whose description requires both magnitude (how much) and direction (which way)

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14
Q

How can vector quantity be represented?

A

can be represented by arrows drawn to scale, called vectors

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15
Q

What Is Equilibrium Rule?

A

the vector sum of forces acting on a non-accelerating object equals zero

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16
Q

Formula for the equilibrium rule

A

in equation form: EF = 0.. Where E Represents sum of & F represents force,

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17
Q

When you stand on two bathroom scales with one foot on each scale and with your weight evenly distributed, each scale will read

A

half your weight.

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18
Q

static equilibrium

A

example: hockey puck at rest on slippery ice

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19
Q

dynamic equilibrium

A

example: hockey puck sliding at constant speed on slippery ice

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20
Q

Equilibrium test

A

A refrigerator at rest is in static equilibrium. If it is moved at a steady speed across a floor, it is in dynamic equilibrium.

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21
Q

Friction

A

occurs when objects rub against one another
applies to solids, liquids, and gases
acts in a direction to oppose motion
example: When an object falls down through air, the force of friction (air resistance) acts upward

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22
Q

Force of friction is also due to the..

A

tiny surface bumps and to “stickiness” of the atoms on a material’s surface

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23
Q

Coefficient Of Force (U)

A

Frictional Force/Normal Force

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24
Q

When Josh pushes a refrigerator across a kitchen floor at a constant speed, the force of friction between the refrigerator and the floor is
A. less than Josh’s push.
B. equal to Josh’s push.
C. equal and opposite to Josh’s push.
D. more than Josh’s push.

A

C.equal and opposite to Josh’s push.

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25
Speed and Velocity
Speed defined as the distance covered per amount of travel time units are meters per second in equation form
26
Formula For Speed
Distance Covered/Time
27
Average Speed
the entire distance covered divided by the total travel time | doesn’t indicate various instantaneous speeds along the way
28
Average Speed Formula
Total Distance Covered/Time
29
What Is Instantaneous Speed?
speed at any instant.
30
What Is Velocity?
a description of how fast and in what direction | a vector quantity
31
What Is Constant Speed?
Constant speed is steady speed, neither speeding up nor slowing down.
32
What Is Constant Velocity?
Constant velocity is constant speed and constant direction (straight-line path with no acceleration).
33
Is Motion Relative To Earth?
Yes
34
What Is Acceleration?
rate at which velocity changes over time | involves a change in speed, direction, or both speed and direction
35
Formula For Acceleration?
Change Of Velocity/ Time Interval
36
What Is Freefall?
falling under the influence of gravity only—with no air resistance
37
How Fast Are Free Falling Objects?
freely falling objects on Earth gain speed at the rate of 10 m/s each second (more precisely, 9.8 m/s2)
38
``` If a falling object gains 10 m/s each second it falls, its acceleration is A. 10 m/s. B. 10 m/s per second. C. both of the above D. neither of the above ```
B.10 m/s per second.
39
What Is A Rate?
An amount over an interval Of Time
40
Flow rate Formula
Volume/Time Interval Ex. Gallons/Minute
41
Miles Per Hour Formula?
Distance/Time Interval
42
Formula For Gravity?
9.8m/sec^2
43
What Is Density?
important property of materials (solids, liquids, gases) measure of compactness of how much mass an object occupies “lightness” or “heaviness” of materials of the same size
44
Formula For Density?
mass/volume
45
Units For Density?
Grams Or Kg
46
Volume Density?
cm3 or m3
47
The volume of 1000 kg of water is
A. 1 liter.
48
Formula For Weight Density?
Weight/Volume
49
``` Which of these has the greatest density? A. 100 kg of lead B. 100 kg of water C. both are the same D. none of the above ```
A. 100 Kg of lead
50
``` When water freezes, it expands. This tells us that the density of ice is A. less than the density of water. B. equal to the density of water. C. more than the density of water. D. none of the above ```
A. less than the density of water.
51
``` Compared with the weight of water, the weight of a liter of ice is A. more. B. less. C. the same. D. none of the above ```
B. less. Explanation When a liter of water freezes, its volume increases. To get a liter of ice you’d have to shave part of it off to be the same size. So there is less water in a liter of ice.
52
What Is Pressure?
the force per unit area that one object exerts on another
53
Pressure In Equation Form
Force/Area
54
Units For Pressure?
units: N/m2, lb/ft2, or Pa (Pascals)
55
``` When you stand on one foot instead of two, the force you exert on the floor is A. less. B. the same. C. more. D. none of the above ```
B. the same.
56
``` When you stand on one foot instead of two, the pressure you exert on the floor is A. less. B. the same. C more. D. none of the above ```
C. More
57
What Is Pressure In Liquid?
force per unit area that a liquid exerts on an object depth dependent and not volume dependent example: swim twice as deep, then twice as much weight of water above you produces as much pressure on you
58
Does Pressure In A Liquid Act Equally In All Directions?
Yes example: your ears feel the same amount of pressure under water no matter how you tip your head bottom of a boat is pushed upward by water pressure pressure acts upward when pushing a beach ball under water
59
Does The Shape Of A Container Effect Pressure?
Weight Density * Depth
60
``` Water pressure provided by a water tower is greater if the tower A. is taller. B. holds more water. C. both A and B D. none of the above ```
A. is taller.
61
What Is Buoyancy?
apparent loss of weight of a submerged object | amount equals the weight of water displaced
62
What Is Displacement Rule?
Displacement rule: A completely submerged object always displaces a volume of liquid equal to its own volume. example: Place a stone in a container that is brim- full of water, and the amount of water overflow equals the volume of the stone
63
``` A cook who measures a specific amount of butter by placing it in a measuring cup with water in it is using the A. principle of buoyancy. B. displacement rule. C. concept of density. D. all of the above ```
B. displacement rule.
64
What Is Buoyant force
net upward force that a fluid exerts on an immersed object = weight of water displaced example: the difference in the upward and downward forces acting on the submerged block is the same at any depth
65
How many forces act on a submerged body at rest in a fluid? A.one—buoyancy B. two—buoyancy and the force due to gravity C. none—in accord with the equilibrium rule, F = 0 D. none of the above
B. two—buoyancy and the force due to gravity
66
What Is Archimedes Principle?
discovered by Greek scientist Archimedes relates buoyancy to displaced liquid states that an immersed body (completely or partially) is buoyed up by a force equal to the weight of the fluid it displaces applies to gases and liquids
67
Example Of Archimedes Principle?
example: if a 3-kg block submerged in water apparently “weighs” 2 kg, then the buoyant force or weight of water displaced is 1 kg
68
``` On which of these blocks submerged in water is the buoyant force greatest? A. 1 kg of lead B. 1 kg of aluminum C. 1 kg of uranium D. all the same ```
B. 1 kg of aluminum Explanation: The largest block is the aluminum one. It displaces more water and therefore experiences the greatest buoyant force.
69
``` When a fish expands its air bladder, the density of the fish A. decreases. B. increases. C. remains the same. D. none of the above ```
A. decreases.
70
``` When a fish makes itself less dense, the buoyant force on it A. decreases. B. increases. C. remains the same. D. none of the above ```
B. increases.
71
``` When a fish decreases the size of its air bladder, the density of the fish A. decreases. B. increases. C. remains the same. D. none of the above ```
B. Increases
72
``` When a submarine takes water into its ballast tanks, its density A. decreases. B. increases. C. remains the same. D none of the above ```
B. Increases
73
``` When a submerged submarine expels water from its ballast tanks, its density A. decreases. B. increases. C. remains the same. D. none of the above ```
A. decreases.
74
What Is Principle Of Flotation?
a floating object displaces a weight of fluid equal to its own weight example: a solid iron 1-ton block may displace 1/8 ton of water and sink. The same 1 ton of iron in a bowl shape displaces a greater volume of water—the greater buoyant force allows it to float
75
Archimedes Denser Fluid Principle
denser fluids will exert a greater buoyant force on a body than less dense fluids of the same volume example: ship will float higher in salt water (density = 1.03 g/cm3) than in fresh water (density = 1.00 g/cm3)
76
``` The reason a person finds it easier to float in salt water, compared with fresh water, is that in salt water A. the buoyant force is greater. B. a person feels less heavy. C. neither of these D.none of the above ```
C. neither of these Explanation: A floating person has the same buoyant force whatever the density of water. A person floats higher because a smaller volume of the denser salt water is displaced.
77
On a boat ride, the skipper gives you a life preserver filled with lead pellets. When he sees the skeptical look on your face, he says that you’ll experience a greater buoyant force if you fall overboard than your friends who wear Styrofoam-filled preservers.
B. He Is correct Explanation: He’s correct, but what he doesn’t tell you is you’ll drown! Your life preserver will submerge and displace more water than those of your friends who float at the surface. Although the buoyant force on you will be greater, the net force downward is greater still!

BISI Midterm 2 (1 decks)

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