Flashcards in Conceptual Physics-Laws of Motion Unit-Final Test Deck (70):

1

## What is a force?

### a push or a pull

2

## What is inertia?

### the tendency of an object to resist changes in its motion; Newton's first law

3

## Will a force have the same effect on different masses?

### the same force will cause less massive objects to accelerate more; mass is a factor in acceleration just as force is

4

## How does mass affect inertia?

### more mass means more inertia; direct relationship

5

## What is the relationship amoung the quantities: force mass, and acceleration?

### force=mass x acceleration; if mass increases, so does force; if force increases, so does acceleration; if mass increases, acceleration decreases

6

## How is an object's center of mass located

### at the balance point, where plumb lines connect, point around which all mass is centered

7

## What happens if the support base is removed from the center of mass?

### the object will fall over

8

## Do different objects fall at different rates towards earth? If so, what causes the difference?

### No, Gravity has a constant rate of acceleration of 10 m/s/s. The only difference would be air resitance/friction.

9

## How can the amount of gravitational force actin on an object be determined?

###
Gravitiy is always 10 m/s/s

gravitational potential is different depends on hieght

10

## What is the difference between weight and mass?

### mass is constant; wieght is a force, pull of gravity on mass

11

## What is meant by balanced and unbalanced forces?

###
balanced: no change in motion; equal and opposite

unbalanced: object accelerates; unequal, always change motion

12

## What does it mean to say that an object is accelerating?

### It's speeding up, slowing down, stopping, starting, or changing direction; it's speed or direction is changing

13

## What causes a stationary object to remain stationary?

### balanced forces

14

## Under what conditions will an object in motion continue to move?

### If the forces are balanced

15

## What is meant by the statement: for every action there is an equal and opposite reaction?

### forces come in action reaction pairs; if you push off a surface in zero gravity, you push towards the wall, but you move away from it.

16

## What determines the amount of friction acting between two objects?

### The types of surfaces: rough surfaces have higher mu

17

## In what direction is friction applied in an object?

### IN the opposite direction of its motion

18

## What would a graph of two surfaces with a lot of friction look like, compared t surface will little friction?

### The graph with lots of friction would have a steeper slope, while the one with little friction would have a flatter/lower slope.

19

## How is the kinetic energy of an object determined?

### How fast it moves and its mass

20

## How is the gravitational potential energy of an object determined?

### how high it is off the ground

21

## What does it mean to say that energy is conserved?

### total energy stay sthe same

22

## What does a graph of Newton's second law look like?

###
acceleration on y, force on x: exponential slope, positive trend, (up on y, forward on x)

acceleration on y, mass on x: exponential slpe, negative trend (down on y, forward on x)

23

## What is momentum, and how would you measure it?

### quantity of motion, kg m/s (mass x velocity)

24

## what does it mean to say that momentum is conserved?

### during collisions: objects transfer momentum to other objects; total momentum is constant

25

## Is a force required to make an object move in a circular path? If so, where does it need to be applied

### yes, towards the center of the circular path, or else it would just go straight, as in the first law

26

## If an object leaves a circular path, what direction will it travel? Explain how to draw a diagram of this.

### draw a circle or curve to represent the path, marking the center of the circle/curve. Draw a line from the center to the point at which the object left the path, then draw a tangent to that point. The direction is that which the object was traveling at the point at which it left the path.

27

## distance unit

###
d

meters m

28

## velocity/speed unit

###
v

meters/second m/s

29

## time unit

###
t

seconds s

30

## force unit

###
F

Newtons N

31

## mass unit

###
m

kilograms kg

32

## energy unit

###
E

joule J

33

## work unit

###
W

joule W

34

## weight unit

###
w

Newtons N

35

## momentum unit

###
p

kilograms meters/second kg m/s

36

## The Law of Conservation of energy

### Energy is not created or destroyed, but it can change forms.

37

## Energy changes forms when...

### work is done

38

## What changes an object's motion?

### A net force

39

## In absence of a net force, an object...

### will stay at rest or will move in a straight line at a constant speed

40

## inertia def

### a measure of an object's tendency to resist a change in motion

41

## Kinetic energy def

### energy that is a result of motion

42

## Potential energy def

### energy that is a result of position, chemical makeup, or the compression or elongation of an object

43

## Centripetal force def

### force that causes an object to move in a circular path, pushes or pull an object toward the center of a circular path

44

## centrifugal force def

### a specific name for the force of inertia on an object that is moving in a circular path

45

## When an object exerts a force on a second object, the second object...

### exerts an equal force on the first object, but in the opposite direction

46

## massive objects have more or less inertia than less massive objects?

### more

47

## Force can be illustrated as a...

### vector (direction and size of force)

48

## net force def

### sum of all forces action on an object

49

## Newton's Second Law

### Acceleration: Objects accelerate when an unbalanced force is applied; it will move in the direction of the force at a speed that is in a direct relationship with the force and an inverse relationship with the object's mass

50

## Newton's First Law

### Inertia: When forces are balanced- an object at rest will stay at rest and an object in motion will stay in motion at a constant speed in a straight line path

51

## Newton's Third Law

### Action-Reaction Pairs: For every action there is an equal and opposite reaction; theses forces act on different objects (than the object exerting them)

52

## work is done when...

### a force acts on an object in the direction in which the object is moving

53

## What is the difference between acceleration and constant speed?

###
Acceleration is when there is a change in motion.

Constant speed does not change.

54

## What is the equation for momentum?

###
momentum= mass x velocity

p=mv

55

## What is a sticky collision?

### It is when two objects collide and begin to move as one; they 'stick together' after the collision.

56

## What is friction

### a force that opposes motion (or attempted motion) of objects that are touching

57

## what is the difference between sliding friction and static friction

###
sliding; objects slide past each other

static: stationary; stay in one place

58

## Sliding friction causes some energy to be changed into...

### thermal energy

59

## coefficient of friction def/equation

### mu= force to slide/upward force

60

## Objects rotate around...

### their center of mass

61

## velocity def

### the rate at which you change position; v=d/t

62

## velocity formula: distance=

### speed x time

63

## velocity formula: time=

### speed divided by distance

64

## force formula: force=

### mass x acceleration

65

## force formula: mass=

### force divided by acceleration

66

## force formula: acceleration=

### force divided by mass

67

## Acceleration formula: acceleration=

### (final velocity - initial velocity)/time

68

## momentum formula: momentum=

### mass x velocity

69

## momentum formula: velocity=

### momentum/mass

70