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Physics Paper 2 > P5 - Forces > Flashcards

P5 - Forces Flashcards

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1
Q

What is a vector quantity

A

Have a magnitude and a direction

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2
Q

Examples of vector quantities

A

Force, velocity, displacement , acceleration

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3
Q

What are scalar quantities

A

Have magnitude but no direction

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4
Q

Examples of scalar quantities

A

Speed, distance, mass, temperature, time

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5
Q

What is a contact force

A

When two objects have to be touching for a force to act, the force is a constant force

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6
Q

What is a non contact force

A

If the objects do not need tobe touching

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7
Q

What is mass

A

The amount of matter in an object

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8
Q

What is weight

A

Weight is the force acting on an object due to gravity

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9
Q

Waht does the weight of an object depend on

A

Its mass and the strength of the gravitational field it is in

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10
Q

How can you calcualate the weight of an object

A

Mass x gravitational Field strength

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11
Q

Relationship between mass and weight

A

They are directly proportional

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12
Q

What is resultant force

A

Number of forces acting on an object , can be replaced by a single force

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13
Q

What does a resultant force have the same effect as ?

A

All the original forces added together

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14
Q

When a force moves an object through a distance , energy is transferred

A

And work is done on the object

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15
Q

What has to happen to make an object move

A

A force must act on it

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16
Q

A force acts on an object .Causes energy

A

To be transferred to the object

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17
Q

Whwn you apply force to an object what may happen to it

A

May deform ,( stretch, compress or bend )

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18
Q

How many forces do you need to make an object deform

A

An object is deformed when more than one force is acting on the object.One force would just make the object move, not change the shape

19
Q

What is elastically deformed

A

It can go back to original shape and length after force has been removed

20
Q

What is inelastically deformed

A

If an object doesn’t go back how it was

21
Q

When a force stretches or compresses then

A

Work has been done

22
Q

When a force stretches a speing, causes it to

A

Extend

23
Q

This extension in spring is what

A

Difference in length between the stretched and unstretched spring

24
Q

What ia displacement

A

Measures the distance and direction in a straight line from an object’s starting point to its finishing point

25
Q

What is speed

A

How fast gou are going

26
Q

What is velocity

A

Velocity is speed in a given direction

27
Q

Speed of person walking

A

1.5

28
Q

Speed of person running

A

3

29
Q

Speed of person cycling

A

6

30
Q

Speed of a car

A

25

31
Q

Speed of train

A

30

32
Q

Speed of passenger plane

A

250

33
Q

What is acceleration

A

Change in velocity in a certain amount of time

34
Q

What is Newton’s First Law

A

If the reultsnt force on a stationary object is zero, the object will remain stationary.If the resultsnt force of a moving object is zero, carry on moving at same velocity

35
Q

The larger the resultant force acting on an object is the

A

More the object accelerates

36
Q

What is Newton’s second law

A

Says that the firce acting on an object and the acceleration of the object is directly proportional

37
Q

What is Newton’s third law

A

When two objects interact, the forces they exert on each other are equal and opposite

38
Q

What does Newton’s third law mean

A

Means if you push something , it will push you back against you, just as hard

39
Q

Stopping distance =

A

Thinking distance + braking distance

40
Q

What is thinking distance

A

How far the vehicle travels during the dirver’s resction time

41
Q

What is braking distance

A

Distance taken to stop under the braking force

42
Q

Stopping distance for different speeds can be estimated

A

The heavier a vehicle is, or the faster it is tracelling, the longer the stopping distsnce will be

43
Q

What is your thinking distsnce be affected by

A

Your speed
Resction time

44
Q

What is your braking distance affected by

A

A fast a vehicle travels , longer it tskes to stop.
Weather or road surface.If there is less grip on the road braking distance will be slower
Condition of your tyres
How good brakes are

Physics Paper 2 (4 decks)

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