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GCSE Triple Physics > Forces > Flashcards

Forces Flashcards

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1
Q

What is a force?

A

A push or a pull that acts on an object due to the interaction with another object

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2
Q

Are forces scalar or vector quantities?

A

Vector

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3
Q

All forces have m____ and d____

A

magnitude and direction

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4
Q

What is the unit of forces?

A

Newton, N

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5
Q

What is a contact force?

A

A force that acts when the two objects are physically touching

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6
Q

Give two examples of a contact force

A
  • Tension
  • Friction
  • Air Resistance
  • Normal Contact Force
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7
Q

What is a non contact force?

A

A force that acts when the two objects are physically separated

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8
Q

Give an example of a non contact force

A
  • Gravity
  • Electrostatic Force
  • Magnetism
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9
Q

What is meant by a Vector Quantity?

A

A quantity with magnitude and direction

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10
Q

Give two examples of vector quantities

A
  • Velocity
  • Force
  • Displacement
  • Acceleration
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11
Q

What is meant by a scalar quanity?

A

A quantity with only magnitude

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12
Q

Give two examples of scalar quantities

A
  • Speed
  • Distance
  • Mass
  • Temperature
  • Time
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13
Q

What is the definition of mass?

A

The measure of how much matter is in an object

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14
Q

What is mass?

A

The measure of how much matter is in an object

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15
Q

What is the unit of mass?

A

Kg

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16
Q

What is weight?

A

The force acting in an object due to gravity

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17
Q

What is the equation for weight?

A

weight = mass x gravitational field strength

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18
Q

Describe the relationship between the weight and mass of an object

A

The weight of an object is directly proportional to its mass

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19
Q

What is the centre of mass of an object?

A

The point at which an object will balance because the weight on either side of the point is the same

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20
Q

What is meant by resultant force?

A

A single force that has the same effect as all the original forces acting together

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21
Q

What is meant by work done?

A

Energy transferred to or from an object which allows it to be moved

22
Q

What is the equation for work done?

A

Work Done = Force * Distance

23
Q

What can all forces be resolved into?

A

Two perpendicular components

24
Q

When calculating the work done against gravity, why do you use the vertical distance?

A

Because the distance must be in the line of action of the force, and weight acts vertically downwards

25
Q

What is meant by an elastic material?

A

One that will return to its original shape after being stretched, providing you haven’t exceeded its elastic limit

26
Q

What happens to objects that have been elastically deformed after forces stretching them are removed?

A

They return to their original shape

27
Q

What happens to objects that have been plastically deformed after forces stretching them are removed?

A

They don’t return to their original shape

28
Q

Can you elastically deform an object with only one force? Why/Why not?

A

No, the object would move rather than change shape

29
Q

What is the equation for the force required to stretch an elastic object

A

Force = spring constant * extension

30
Q

Independent variable in the stretching a spring practical

A

The weight on the spring

31
Q

Dependent variable in the stretching a spring practical

A

The extension produced by different weights

32
Q

Control variable in the stretching a spring practical

A

Material of the spring

33
Q

What is meant by elastic limit?

A

The greatest stress that can be applied without causing plastic deformation

34
Q

What is the equation for elastic potential energy?

A

EPE = 1/2ke^2

35
Q

What does a curve mean on a distance time graph?

A

A changing velocity

36
Q

What is meant by acceleration?

A

The change in velocity per second

37
Q

How can you find the distance travelled on a velocity time graph?

A

Calculate the area under the curve

38
Q

What is Newton’s First Law?

A

An object will remain at rest or a constant velocity unless acted on by a resultant force

39
Q

What is Newton’s second law?

A

The force acting on an object is proportional to the rate of change of momentum it causes

40
Q

What is Newton III?

A

If object A exerts a force of object B, object B exerts an equal and opposite force on object A

41
Q

Which two components make up stopping distance?

A

Thinking Distance and Braking Distance

42
Q

What can affect the thinking distance?

A

• Blood Alcohol Level
• Tiredness
• Speed of the Car
• Drugs in the driver’s body

43
Q

What can affect the Braking Distance?

A

• Weather
• Condition of the brakes
• Condition of tyres
• Mass of the car

44
Q

Whats the equation for momentum?

A

Momentum = mass x velocity

45
Q

What is meant by momentum?

A

It is a measure of how difficult it is to stop a moving object

46
Q

Is momentum scalar or vector?

A

Vector

47
Q

What does the conservation of momentum state?

A

In any collision the total momentum is constant in the absence of external forces

48
Q

What is meant by an inelastic collision?

A

One where the total kinetic energy reduces due to being lost by heat or sound

49
Q

What is an elastic collision?

A

One where the total kinetic energy before is the same as after

50
Q

What is the equation for moments?

A

Force x Perpendicular Distance

51
Q

What is a moment?

A

The turning effect of a force

52
Q

What are levers and gears?

A

Force multipliers

GCSE Triple Physics (6 decks)

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