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GCSE Physics AQA > P8 - Forces In Balance 2️⃣✅ > Flashcards

P8 - Forces In Balance 2️⃣✅ Flashcards

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1
Q

What is a scalar quantity?

A

A scalar quantity only has magnitude (size)

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2
Q

What is a vector quantity?

A

A vector quantity has magnitude (size) and direciton

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3
Q

What is displacement?

A

Distance in a given direction

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4
Q

What is Newtons 3rd Law?

A

When an objects interact, they always exert equal and opposite forces on eachother

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5
Q

What is a contact force?

A

A force where the objects are physically touching

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6
Q

What is a non-contact force?

A

A force where the objects are physically separated

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7
Q

What is Newtons 1st Law?

A

An object will remain at a constant velocity unless a resultant force acts upon it

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8
Q

What is a resultant force?

A

A single force equivilent to all the forces acting on an object

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9
Q

Give 5 examples of a contact force

A
  • fricton
  • air resistance (drag)
  • tension
  • normal contact forces
  • upthrust
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10
Q

Give 3 examples of a non-contact force

A
  • gravity
  • magnetic force
  • electrostatic
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11
Q

The weight of an objects depends on what?

A

The gravitational field strength at the point where that object is

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12
Q

What is a moment?

A

A moment is the turning effect of a force

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13
Q

What is the pivot?

A

The centre of rotation

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14
Q

What is another name for a pivot?

A

A fulcrum

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15
Q

What is the principle of moments?

A

If an object is at equilibrim, the sum of all the clockwise moments about any point = the sum of all the anticlockwise moments about that point

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16
Q

What is the equation for moments?

A

moment of force (Nm) = force (N) x PERPENDICULAR distance from pivot (m)

17
Q

What is a lever?

A

A mechanism that uses moments to make a job easier. Its a force multiplier, meaning it requires less force than it delivers

18
Q

What is a gear?

A

A rotating wheel with ‘teeth’ (cogs) used to transmit power

19
Q

What is a free-body force diagram?

A

A diagram that shows the forces acting on an object

20
Q

What is the centre of mass?

A

The center of mass is the point where we can assume all the mass of the object is concentrated

21
Q

Where can you find an objects centre of mass if its a regular shape.

A

Where all of its lines of symmetry cross

GCSE Physics AQA (19 decks)

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