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GCSE AQA Physics Flashcards > P8 Forces > Flashcards

P8 Forces Flashcards

1
Q

What is displacement?

A

Distance in a certain direction

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2
Q

What is a scalar quantity?

A

Physical quantities with a magnitude but no direction

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3
Q

What is a vector quantity?

A

Physical quantites with a magnitude and direction

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4
Q

Is distance a scaler or vector quantity?

A

Scaler, it has size but no direction

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5
Q

Is displacement a scaler or vector quantity?

A

Vector, it shows size/magnitude and direction

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6
Q

What is the difference between speed and velocity?

A

Speed is a scaler (only magnitude)
Velocity is a vector (magnitude and direction)

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7
Q

What is magnitude?

A

The size of quantity

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8
Q

Is force a scaler or vector?

A

Vector , a size and direction is given

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9
Q

A force can cause an object to ….

A
  • Change shape (stretch or squash)
  • Change its motion (accelerate/deccelerate)
  • Change its state of rest (start moving)
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10
Q

What key words are used to describe motion?

A

Constant velocity
Constant speed
Stationary
In motion
Acceleration
Deceleration

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11
Q

What are contact forces?

A

If two objects must touch to interact then these are contact forces

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12
Q

What are non-contact forces?

A

If two objects don’t need to directly touch to interact these are non-contact forces.

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13
Q

What is Newton’s 1st Law?

A

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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14
Q

What is Newton’s 2nd 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 the object

Accept - mass x acceleration = resultant force

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15
Q

What is Newton’s 3rd Law?

A

When two objects interact with each other they exert equal and opposite forces on each other.

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16
Q

What is friction?

A

The force exerted by a surface against an object when it moves across it

17
Q

If forces are balanced on a stationary object ….

A

… the object remains stationary

18
Q

If forces are balanced on an object already in motion then ….

A

…. the object stays at that constant velocity

19
Q

If the forces are unbalanced, on either an object in motion or stationary …..

A

….. that will result in acceleration

20
Q

What is a moment?

A

A moment is a turning force

21
Q

How do you find the moment?

A

Force x Perpendicular Distance from the Pivot = Moment

22
Q

How do you find the force?

A

Moment / Perpendicular Distance from the Pivot = Force

23
Q

How do you find the Perpendicular Distance from the Pivot?

A

Moment / Force = Perpendicular Distance from the Pivot

24
Q

How do you find gear radius?

A

Moment / Force = Gear Radius

25
Q

How to find the resultant force using a paralellogram?

A
  • Step 1 : Determine your scale
  • Step 2 : Draw your vectors to the chosen scale
  • Step 3 : Complete the paralellogram shape
  • Step 4 : Draw a diagonal from the point of origin to the opposite corner
  • Step 5 : Measure the diagonal and determine the magnitude according to the scale
26
Q

What is the centre of mass?

A

Centre of mass is where mass is thought to be most concentrated.

27
Q

What is it meant by suspended equilibrium?

A

An object can be suspended at a fixed point by a string, allowing it to hang freely and be in equilibrium (at rest)

28
Q

What does equalibrium mean?

A

An object at rest is in equalibrium, it must have a resultant force of 0N and no overall turning force

29
Q

What is the resultant force?

A

The total amount of force acting on the object or body along with the direction of the body

30
Q

Is the resultant force a scaler quantity or vector quantity?

A

Vector quantity, as it shows magnitude and direction

31
Q

What does the gradient of a Distance-Time graph represents?

A

Velocity (m/s)

32
Q

What does the gradient of the Velocity-Time graph represent?

A

Accelereation (m/s^2)

33
Q

How do you calculate weight?

A

Weight = Mass x Gravitational Field Strength

(earth’s gravitational field strength is 9.8)

GCSE AQA Physics Flashcards (15 decks)

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