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Physics And Chemistry > Chapter 3- Forces > Flashcards

Chapter 3- Forces Flashcards

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1
Q

What is Newton’s 2nd Law?

A

The more mass an object the more force it will take to make it accelerate.

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2
Q

What is the formula for newton’s 2nd law.

A

F=ma

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3
Q

What is friction?

A

A force that can stop an object in motion

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4
Q

What does friction want to do?

A

wants stop sliding motion

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5
Q

What are microwelds?

A

the source friction

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6
Q

How do microwelds form?

A

When bumps come in contact

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7
Q

When are microwelds the strongest?

A

when a larger force pushes them together

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8
Q

How do you break microwelds?

A

force must be applied

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9
Q

What is static friction?

A

the force that prevents two forces from sliding past each other

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10
Q

What else do I need to know about static friction?

A

static friction is where a force is canceling your push

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11
Q

What is a force that isn’t strong enough to break microwelds?

A

Static Friction

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12
Q

What is sliding friction?

A

a force that opposes motion of two surfaces sliding past one another.

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13
Q

What is sliding friction caused by?

A

microwelds continually braking then forming again

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14
Q

What do you have to do to keep something moving during sliding friction?

A

you have to constantly be pushing it

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15
Q

What is rolling friction?

A

A force between a rolling object and the surface it rolls on

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16
Q

What happens if static friction acts over a deformed area?

A

it causes rolling friction

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17
Q

What is air resistance?

A

opposes the motion of objects through the air

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18
Q

What direction does air resistance act in?

A

the opposite direction to a motion of an object through the air

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19
Q

What would happen if air resistance didn’t exist?

A

All object would fall at the same speed.

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20
Q

What does air resistance on an object depend on?

A

speed, size, and shape

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21
Q

What is one thing Air resistance doesn’t depend on?

A

Mass

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22
Q

What is terminal velocity?

A

the downward force of gravity causing and object to accelerate

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23
Q

What happens when an object is falling very fast?

A

the upward force of the air resistance increase

24
Q

the net force of an object is when what happens?

A

there’s a balanced downward force of gravity

25
Q

What does terminal velocity depend on ?

A

size,shape and mass

26
Q

what is gravity?

A

an attractive force between any two objects

27
Q

What are the two things gravity depends on?

A

mass of the objects and distance between them.

28
Q

how does the force of gravity increase?

A

mass of either object increases, or the objects move closer together.

29
Q

Is gravity one of the four basic forces?

A

Yes

30
Q

What are 3 of the other basic forces?

A

electromagnetic force, strong nuclear force, and weak nuclear force.

31
Q

where do the 2 nuclear forces work?

A

on particles in the nuclei of atoms.

32
Q

What causes Electricity and magnetism?

A

electromagnetic force.

33
Q

What is the formula for gravitational force?

A

gravitational force= mass x acceleration(due to gravity)

34
Q

Can gravity ever be zero?

A

no matter how far apart 2 objects are gravity never goes to zero.

35
Q

what is it called when all forces except gravity can be ignored?

A

free fall

36
Q

How fast is the acceleration of an object in free fall near the earths surface?

A

9.8 m/s squared

37
Q

What is weight?

A

The gravitational force exerted on an object.

38
Q

Is weight a force?

A

yes

39
Q

What is mass?

A

a measure of the amount of matter an object contains.

40
Q

If you throw a ball horizontally what will it do?

A

It will go in a curve (gravity)

41
Q

if you drop a ball straight down and one as hard as possible horizontally will it fall at the same rate?

A

Yes

42
Q

When a ball goes around in a circle what change of direction is the velocity going in?

A

toward the center.

43
Q

What is acceleration toward the center of a curved path called?

A

centripetal acceleration

44
Q

When a ball has centripetal acceleration what is the direction of the net force?

A

The center of the curved path.

45
Q

What is the net force exerted toward the center of the curved path called?

A

Centripetal force.

46
Q

What is one thing that centripetal force works for?

A

when a car is turning it keeps it from falling over

47
Q

What is newton’s 3rd laws?

A

for every action there is an equal or opposite reaction.

48
Q

what is an example of newton’s 3rd law?

A

Trampoline

49
Q

What happens when a rocket exerts gasses on the ground.

A

newton’s 3rd law and the rocket will go up as it pushes down on the ground.

50
Q

What is momentum?

A

the product of mass and velocity.

51
Q

What is the opposite of momentum?

A

Inertia

52
Q

Is momentum a force?

A

no

53
Q

What is the symbol for momentum?

A

P

54
Q

How can momentum change?

A

mass, velocity, or both change.

55
Q

Can momentum be transferred into different objects?

A

Yes

56
Q

If a ball is still what is its momentum?

A

there is none, it isn’t lost or created.

57
Q

what is weightlessness?

A

When you have practically no gravity pulling you down (you feel weightless

Physics And Chemistry (1 decks)

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