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Chem Phys > Chapter 12 Test > Flashcards

Chapter 12 Test Flashcards

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1
Q

What is freefall

A

An object accelerating downwards without outside force pushing upward, second law unbalanced

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2
Q

What is terminal velocity

A

The speed at which an object no longer accelerates, first law balanced forces

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3
Q

What is projectile, and what is its motion

A

Any object thrown in the air, always a curved path

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4
Q

What is Newton’s first law

A

Object at rest remains and rest and an object in motion remains in motion until acted on by an unbalanced force

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5
Q

Newtons first law describes motion as

A

Balanced forces acting on an object

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6
Q

What is newtons second law

A

And unbalanced force on an object that causes it to accelerate in the direction of that force

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7
Q

Newtons first law is also known as

A

Inertia

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8
Q

What is newtons third law

A

For every action by a force there is always an equal and opposite reaction by another force

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9
Q

What is force

A

A push or pull that stops starts or changes direction of an object in motion

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10
Q

What is friction

A

A force that opposes the motion of an object

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11
Q

What is sliding friction,example

A

Went to solid forces slide over each other, skiing

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12
Q

What is rolling friction, example

A

When an object rolls over a surface, skateboarding

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13
Q

What is fluid friction, example

A

When an object moves through a fluid liquid or a gas, skydiving or swimming

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14
Q

What is static friction, example

A

A force that acts against objects that are not moving. Strong friction., Pushing a desk or walking

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15
Q

What is momentum

A

Mass in motion, moving body that equals the product of its mass multiplied by its velocity

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16
Q

What is the law of conservation of momentum

A

Total momentum remains the same. If one object loses momentum another object is gaining momentum

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17
Q

How is the 90 kg defensive back able to knock over a 120 kg fullback

A

The defensive back has a greater velocity which gives them more momentum

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18
Q

Why is a follow-through important and tennis and baseball

A

Longer in contact, more momentum is transferred to the ball

19
Q

What is gravity

A

The attractive force between all objects in the universe

20
Q

What are three things force can you do to an object

A

Stop start or change direction

21
Q

What are three factors that affect the force of sliding friction

A

Surface area, texture, Mass.

22
Q

What are three examples of things that are used to increase friction to help us

A

Wheels, shoes, sails on boats

23
Q

What are balanced forces give some examples

A

Terminal velocity, constant velocity

24
Q

What effect do balanced forces have on objects motion

A

None, they don’t change the motion

25
Q

Which law deals with conservation

A

Third law, balanced

26
Q

Car a and Car b are both traveling at 100 km per hour and collide had on. Car b is pushed back 50 km why?

A

Car a has to be twice as heavy

27
Q

What do we call the change in momentum?

A

impulse

28
Q

How is force related to time

A

More time equals less force and vice versa

29
Q

What are unbalanced forces

A

Second law, forces that do not add up to zero, changes objects motion

30
Q

What effect does an unbalanced force have on the speed and direction of an object

A

Changes speed or direction

31
Q

What is inertia

A

The resistance of an object to change motion, first law

32
Q

If you jumped up in the air neglecting air resistance in the back of a Ford pick up truck going 100 mph, where would you land? why?

A

In the same place you jumped because your body is still going 100 mph in the air

33
Q

Which two factors affect the acceleration of an object

A

Force and mass

34
Q

What does newtons third law say about forces

A

They always act in pairs

35
Q

Give three examples of a newtons third law

A

Walking, leaning on the wall, shooting a rifle

36
Q

What is terminal velocity

A

When acceleration no longer increases, constant velocity, FF equals FG

37
Q

What causes the curved path of a projectile

A

Gravity

38
Q

What is weight

A

Measure of the force of gravity on an object to

39
Q

Would your weight be greater on earth, the moon, or Saturn

A

Saturn

40
Q

What are your way to be greater in Tempe or in Flagstaff? Why?

A

Tempe, closer to center of Earth

41
Q

Would your mass be greater here, or on the moon

A

Here

42
Q

What is a synonym for air resistance

A

Drag force

43
Q

Projectile motion is the product of gravity and what

A

Inertia

Chem Phys (6 decks)

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