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Physics > Physics 2: momentum, energy rotational motion > Flashcards

Physics 2: momentum, energy rotational motion Flashcards

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1
Q

inertia in motion. The product of the mass of an object and its velocity.

A

momentum

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2
Q

Momentum =

A

mass x velocity OR if direction is not a factor, mass x speed

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3
Q

If the momentum of an object changes then either the ___ or the ____ or both change.

A

mass or velocity

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4
Q

also changes momentum

A

how long a time the force acts

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5
Q

both _____ and __ ____ are important in changing momentum

A

force and time interval

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6
Q

impulse =

A 
impulse = the quantity of force x time interval
(Impulse = Ft)
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7
Q

change in momentum

A

impulse

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8
Q

When an object ____ the impulses are greater than when the object comes to a stop

A

bounces

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9
Q

only an impulse ____ to a system can change the momentum of the system

A

external

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10
Q

Momentum has both:

A

direction and magnitude

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11
Q

In the absence of an external force, the momentum of a system remains unchanged

A

Law of Conservation of Momentum

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12
Q

colliding objects rebound without lasting deformation or generation of heat

A

Elastic collision

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13
Q

when objects become entangled during the collision; characterized by deformation, or generation of heat, or both.

A

Inelastic collision

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14
Q

Net momentum ____ ____ in any collision regardless of the angle between the paths of the colliding objects

A

remains unchanged

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15
Q

force x distance

A

Work

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16
Q

the unit of measurement of work

A

joule

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17
Q

amount of work done per time it takes to do it.

A

Power = work done/time interval

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18
Q

The unit of power

A

watt (joules per second)

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19
Q

something that enables an object to do work

A

Energy

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20
Q

Energy is measured in ____.

A

joules

21
Q

2 common forms of mechanical energy:

A
  1. energy due to the position of something

2. the movement of something

22
Q

energy stored and held in readiness

A

potential energy

23
Q

potential energy due to elevated positions

A

gravitational potential energy

24
Q

potential energy can change into ____ ____.

A

kinetic energy

25
Q

energy of motion

A

kinetic energy

26
Q

1/2 mass x speed x speed =

A

kinetic energy

27
Q

net force x distance =

A

kinetic energy

28
Q

work = change in ____

A

kinetic energy

29
Q

Energy cannot be created or destroyed; it may be transformed from on form into another, but the total amount of energy never changes

A

Law of Conservation of Energy

30
Q

device for multiplying forces or changing the direction of forces. They work on the principle of conservation of energy

A

machine

31
Q

one of the simplest machines

A

lever

32
Q

if the little work done by friction is small enough to neglect, then the work input will equal work output

A

(Fd)input = (Fd)output

33
Q

point of support on which the lever rotates

A

fulcrum

34
Q

when the fulcrum is close to a load,

A

a small input force will produce a large output force

35
Q

useful energy output/total energy input

A

efficiency

36
Q

linear speed of something moving along a circular path

A

tangential speed

37
Q

____ ____ is directly proportional to the distance from the axis for any given rotational speed

A

tangential sped

38
Q

units of tangential speed

A

m/s or km/h

39
Q

Rotational rates

A

RPM revolutions per minute

40
Q

When tangential speed undergoes a change

A

tangential acceleration

41
Q

the property of an object to resist changes in its rotational state of motion

A

rotational inertia

42
Q

rotational inertia depends on ____ about axis of rotation

A

mass

43
Q

the rotational counterpart of force

A

torque

44
Q

if you want to make a stationary object rotate apply ___

A

torque

45
Q

lever arm x force =

A

torque

46
Q

the average position of all the mass that makes up the object

A

center of mass

47
Q

used to express center of mass. It is the average position of weight distribution

A

center of gravity

48
Q

ideal way to increase stability

A

wide BOS and lower COG

49
Q

rotational inertia x rotational velocity

A

Angular momentum

Physics (4 decks)

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