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motion Flashcards

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1
Q

What is a scalar

A

Measures only size

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2
Q

What is a vector

A

Measures both size and direction

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3
Q

What is distance

A

Is how far something is

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4
Q

Is distance a scalar or vector quantity

A

Scalar

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5
Q

What is displacement

A

Is how far something is from a particular point

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6
Q

Is displacement scalar or vector quantity

A

Vector

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7
Q

What is speed

A

How fast something is

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8
Q

Is speed a scalar or vector

A

Scalar

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9
Q

What is velocity

A

How fast something is in a given direction

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10
Q

Is velocity scalar or vector

A

Vector

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11
Q

What are the five vector quantities

A

Force ,acceleration,displacement,momentum,velocity

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12
Q

What is the equation for distance

A

Distance = speed divided by time

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13
Q

what is the equation for acceleration

A

a= v-u/t

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14
Q

what is acceleration measured in

A

m/s squared

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15
Q

what is the second equation for acceleration including distnace

A

v2-u2 = 2xaxd

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16
Q

What does v stand for in the second equation for acceleration

A

end velocity

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17
Q

what does the u stand for in the second equation for acceleration

A

Start velocity

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18
Q

what is the equation for force

A

force = mass x acceleration

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19
Q

What is force measured

A

newtons

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20
Q

wat is mass measured in

A

kg

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21
Q

what is the equation for weight

A

weight = mass x gravitational field strength

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22
Q

What is weight measured in

A

newtons

23
Q

why is weight measured in newtons

A

because weight is a force

24
Q

what is gravitational field strength measured in

A

n/kg

25
Q

what is the equation for momentum

A

momentum =mass x velocity

26
Q

what is momentum measured in

A

kgm/s

27
Q

what is terminal velocity

A

wherethe ball is travelling at a constant speed

28
Q

what is the law of conservation of momentum

A

The momentum before the collision =the momentum after the collision

29
Q

What is a closed system

A

is where no external forces act on it

30
Q

what is the crumple zone

A

if you crash into a car the car will crumple reducing the impact

31
Q

In a distance speed time,what does a horizontal line mean

A

stationary

32
Q

in a distance speed time graph ,a line on a slope mean

A

steady speed

33
Q

in a distance speed time graph , what does a curved line mean

A

acceleration

34
Q

what is deceleration

A

speeding down

35
Q

what is the equation for a stopping distance

A

stopping distace = thinking distance + breaking distance

36
Q

what four factors effect reaction time

A

tiredness,distrractions,alchol consumption,drugs

37
Q

What is the average persons reaction time

A

0.7s

38
Q

name three non contact forces

A

weight,electrostatic force,and magnetic

39
Q

what is newtons first law

A

Newton’s first law states that if the result force acting upon an object is zero its acceleration is zero

40
Q

what is the centripetal force

A

the force that goes towards the centre of the spinning object ,the bigger the circle then the smaller the force

41
Q

what is netwon’s second law

A

the acceleration of an object is directly proportional to the resultant force in the same direction as the force ( and inversely proportional to the mass of object). f=ma

42
Q

What is Newton’s third law

A

For every reaction there is an equal and opposite action

43
Q

Why is the unit for acceleration for meters second squared

A

because the unit for change in velocity is meters per second and the unit for time is seconds so when you divide meters per seconds by seconds ,you get meters per second squared .

44
Q

What is 1 hour in seconds

A

3600s

45
Q

How many meters r in a mile

A

1600 meters

46
Q

In a velocity time graph. What does a horizontal line mean

A

Constant speed

47
Q

In a velocity time graph, the area under the graph respresents …

A

Distance travelled

48
Q

In a resultant force, when the arrow are pointing in different directions what does it mean

A

Bigger force- smaller force

49
Q

In a resultant force , when the arrows r moving in the same directions

A

Bigger force + smaller force

50
Q

WHat is thrust

A

It is the force that move things forward

51
Q

What is friction

A

The force that occurs between two objects rubbing together

52
Q

What is the equation for change of momentum

A

Final mass - initial mass

53
Q

What is the second force equation

A

Final mass - initial mass / time

54
Q

What is the third force equation

A

Change in momentum/ time

physics (8 decks)

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