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Combined Sciences > Forces > Flashcards

Forces Flashcards

1
Q

What is a force?

A

A force is something that acts in an object that can change its shape, dried film or speed.

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2
Q

What is force measured in?

A

Newtons (N)

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3
Q

What type of quantity is force?

A

A vector quantity

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4
Q

What are the three main force types?

A

Push
Pull
Twist

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5
Q

What are friction and air resistance in comparison to each other?

A

Opposing forces

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6
Q

What happens when two solids are rubbed together?

A

Friction opposes movement

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7
Q

What happens when an object moves through air?

A

Air resistance opposes movements

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8
Q

Where does thrust come from?

A

Thrust comes from engines or pushing forces

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9
Q

What force stops us from falling through the earth?

A

Normal force pushing up from the ground

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10
Q

How do you draw a full body diagram?

A

Draw a circle or square as the object

Draw arrows in the direction of the forces

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11
Q

What is left over force called?

A

A resultant force

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12
Q

What does it mean if there is resultant force?

A

The forces are unbalanced

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13
Q

What do we call gravity?

A

Force due to gravity

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14
Q

What is normal force?

A

The force when an object is on the ground

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15
Q

What is Newton’s first law?

A

If there is no resultant force then a body remains moving at a constant velocity or it remains at rest
If there is a resultant force then a body will speed up, slow down or change direction –> accelerate

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16
Q

If forces in opposite directions are equal what does it mean?

A

The forces are balanced, the resultant force is zero

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17
Q

What does it mean if forces on an object are unbalanced?

A

There is a nonzero resultant force on the object

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18
Q

What can happen to the force if an object is moving?

A

The force can change the speed or direction of movement.

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19
Q

If an object moves in a circle what does this mean about its speed and what does it mean about its velocity?

A

It has a constant speed but a changing velocity

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20
Q

For a change in direction to happen in an object what must there be?

A

Ethereal needs to be a resultant force

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21
Q

What do we call the force that allows an object moving in a circle to move?

A

The centripetal force

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22
Q

Where does the centripetal force act?

A

Towards the centre of a circle

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23
Q

What three things can the centripetal force be caused by?

A

Tension, friction or force due to gravity

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24
Q

What is gravitational field strength a fancy word for?

A

Gravity

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25
Q

What are the two ways to change weight?

A

Change the mass

Change the amount of gravity acting upon the object

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26
Q

What is mass?

A

Mass is how much matter we are made of. It is also the measure of how difficult it is to change the velocity of an object.

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27
Q

What is weight?

A

Weight is a force and if is a measure of how much a planets gravity is pulling on us?

28
Q

What quantity is mass?

A

A scalar quantity.

29
Q

What quantity is weight?

A

A scalar quantity

30
Q

What is the equation to work out weight?

A

Weight = mass x gravitational field strength

31
Q

What is the SI to measure mass?

A

Kg

32
Q

Why do we measure gravitational field strength in?

A

M/s^2

33
Q

What is the gravitational field strength on earth?

A

10m/s

34
Q

What do force and mass effect on objects?

A

The acceleration of objects?

35
Q

What is Newton’s second law?

A

Acceleration is; directly proportional to the resultant force. Inversely proportional to the mass.

36
Q

What is the equation to work out force?

A

Force = mass x acceleration

37
Q

What do we measure acceleration in?

A

m/s^2

38
Q

What do we have to call mass?

A

Inertial mass

39
Q

What is an easy way to work out weight on earth?

A

Weight on earth is mass x 10

40
Q

How do you work out the distance using a velocity time graph?

A

Base x height

41
Q

Speed = ?

A

Speed - distance / time

42
Q

What is the SI unit for speed?

A

Meters per second

43
Q

What is the SI unit for distance?

A

Meters

44
Q

What is the SI unit for time?

A

Seconds

45
Q

Weight = ?

A

Weight = mass x gravity

46
Q

V^2 - u^2 = ?

A

2 x a x X

47
Q

Why is velocity?

A

Speed in a given direction

48
Q

What is acceleration at constant velocity?

A

0 m/s

49
Q

When does velocity change?

A

Velocity changes when an object changes direction

50
Q

What direction does centripetal force act in?

A

Inwards towards the object

51
Q

What does centripetal force cause an object to do?

A

Constantly change direction

52
Q

What is drag another word for?

A

Air resistance

53
Q

Every force applies has a reaction force that is: ? (Two things

A

Equal in magnitude (size

Opposite in direction

54
Q

What are the two forces of the same size (original and reaction) acting on?

A

Each other (so different objects)

55
Q

What is the equation to work out momentum?

A

Momentum = mass x velocity

56
Q

What is the SI unit for measuring momentum?

A

Kgm/s

57
Q

What is the SI unit for measuring mass?

A

Kg

58
Q

What is the SI unit for measuring velocity?

A

M/s

59
Q

What type of quantity is momentum?

A

Vector quantity

60
Q

What is important in momentum?

A

The Direction

61
Q

What is momentum and what does this mean?

A

Momentum is constant, this means momentum before collision = momentum after collision

62
Q

What is the other word for constant?

A

Conserved

63
Q

What should we always assume in momentum questions unless told otherwise?

A

That there is no friction to slow things down

64
Q

If an object moving in one direction has a positive momentum and there is an object traveling in an opposite direction, what type of momentum does this object have?

A

A negative momentum

65
Q

When the question gives a direction in momentum what must you give in your answer?

A

The direction

Combined Sciences (4 decks)

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