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key definitions for n5 physics > dynamics > Flashcards

dynamics Flashcards

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Physics 101 flashcards AP® Physics flashcards
1
Q

what is speed ?

A

the distance travelled per unit of time

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2
Q

what is instantaneous speed ?

A

speed at one point in a journey

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3
Q

what is average speed ?

A

the total distance divided by the total time

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4
Q

what is acceleration ?

A

the change in velocity per second

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5
Q

is deceleration negative ?

A

yes

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6
Q

how can you calculate the distance for a journey ?

A

area under the line

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7
Q

when is a forces acting on an object balanced ?

A

when they are equal in size and act in opposite directions

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8
Q

do balanced forces cancel each other out ?

A

yes so the object will remain still

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9
Q

you need a direction when stating an unbalanced force. true or false ?

A

true

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10
Q

why do we want friction ?

why do we not want friction ?

A

to slow an object down

to enable an object to travel at greater speeds without wasting energy

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11
Q

what is newtons first law ?

A

BALANCED FORCE GIVES CONSTANT VELOCITY
an object will either remain at rest or continue to move with the same speed (balanced forces) and direction until acted on by an unbalanced force.

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12
Q

what is newtons second law ?

A

when an object is acted upon by an unbalanced force it will accelerate or decelerate.

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13
Q

what is mass ?

A

the quantity of matter in an object

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14
Q

what is weight ?

A

force of gravity on an object

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15
Q

what is gravitational field strength ?

A

the size of force per kilogram of mass

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16
Q

mass should be in grams true or false ?

A

false should ALWAYS BE IN KG

17
Q

what is terminal velocity ?

A

weight is balanced by air friction

18
Q

how do you get to terminal velocity ?

A

the weight downwards is greater than the air friction upwards so there is an unbalanced force downwards this means that the parachutist accelerates downwards.
as the speed increases the air friction increases until it balances the weight. the parachutist has then reached their maximum velocity and will then travel at a constant speed

19
Q

what is Ew (work done) ?

A

pushing an object over a distance

20
Q

what is Ep (gravitational potential energy)

A

how the work done in raising an object is stored

21
Q

any object that is above the ground has gravitational potential energy, true or false ?

A

true

22
Q

what is Ek (kinetic energy) ?

A

the energy associated with any moving object

23
Q

what transition of energy is a falling object ?

A

potential energy to kinetic energy so Ep=Ek

24
Q

what transition of energy is an object on a slope ?

A

potential energy to kinetic energy and heat (friction)

Ep=Ek+Ew (friction) Ep=Ek

25
Q

what transition of energy is a pendulum ?

A

continual from potential energy to kinetic then back to potential
Ep (top) =Ek (bottom) = Ep (top)

key definitions for n5 physics (2 decks)

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