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physics 2 > speed > Flashcards

speed Flashcards

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1
Q

what is distance

A

how far an object moves

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2
Q

what type of quantity is distance

A

scalar

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3
Q

what is displacement

A

the distance and direction of a straight line to an objects starting point to its finish point

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4
Q

what is velocity

A

an objects speed in any given direction

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5
Q

what is the equation linking distance speed and time

A

distance (m)= speed (m/s)x time(s)

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6
Q

what is the average walking speed

A

1.5 m/s

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7
Q

what is the average running speed

A

3 m/s

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8
Q

what is the average cycling speed

A

6 m/s

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9
Q

what happens if an objects velocity changes

A

its direction changes even if its speed is constant

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10
Q

what is acceleration

A

the change in an objects velocity per second

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11
Q

what type of quantity is acceleration

A

vector

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12
Q

what type of quantity is displacement §

A

vector

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13
Q

what type of quantity is velocity

A

vector

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14
Q

when is an object accelerating

A

when its speed or direction or both are changing

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15
Q

what is deceleration

A

a negative acceleration , when an object is slowing down

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16
Q

what is uniform acceleration

A

when the acceleration of an object is constant

17
Q

what happens when a object moves through a fluid

A

drag forces act on it

18
Q

what direction do drag forces act in regards to an objects movement

A

drag forces act in the opposite direction to an objects movement

19
Q

when do drag forces increase

A

drag forces increase with speed - the greater the speed the greater the frictional force

20
Q

what do drag forces depend on

A

the shape and size of the object

21
Q

what does streamlining do

A

reduces the drag experienced by an object

22
Q

what is air resistance

A

frictional drag force in the air

23
Q

what is terminal velocity

A

the constant velocity a falling object reaches when the frictional force acting on it is equal to its weight

24
Q

when an object falls through a fluid which forces are acting on it

A

its weight due to gravity and the drag force

25
Q

what force remains constant an object falls through a fluid

A

its weight

26
Q

what is the drag force like in the beginning when an object falls through a fluid

A

small but gets bigger as the object speeds up

27
Q

what happens to the resultant force as the object falls through a fluid

A

it will get smaller as the drag force increases

28
Q

what happens to the objects acceleration as it falls through a fluid

A

decreases as it falls

29
Q

what happens if an object falls through a fluid for a long enough time

A

it will reach a final steady speed

physics 2 (8 decks)

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