SP8/9 - Forces Doing Work/ Forces and their Effects Flashcards

1
Q

What is the equation for work done?

A

Work done (J) = force (N) x distance moved in the direction of the force (m)
E = F x d

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2
Q

What is power?

A

The rate at which energy is transferred. It is measured in watts (W) (1 watt = 1 joule is transferred per second)

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3
Q

What is the equation for power?

A

Power (W) = work done (J) / time taken (s)
P = E/t

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4
Q

What is work done?

A

The energy transferred by a force.

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5
Q

What are the three non-contact forces?

A
  • gravity
  • magnetism
  • electrostatic
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6
Q

What are the properties of a gravitational field?

A
  • objects are pulled towards the centre of mass
  • it can only act in one direction
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7
Q

What are the properties of a magnetic field?

A
  • the force acts from North to South
  • the force is strongest at the poles
  • the force can act in two directions
  • can attract magnetic materials (iron, steel, nickel, cobalt) and attract or repel other magnets (N+S = attract, S+S = repel, N+N = repel)
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8
Q

What are the properties of an electrostatic field?

A
  • the force moves away from positive towards negative
  • it can act in two directions
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9
Q

What is a force field?

A

The space around an object where it can affect other objects.

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10
Q

What is a free body force diagram?

A

A picture showing the forces that act on a body. Dots or rectangles represent the object.

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11
Q

How do you draw a vector diagram?

A
  • Create a scale (e.g. 5kN = 1cm)
  • draw lines at the correct angles (it will tell you what angle this is in the question)
  • connect the lines to draw a parallelogram
  • draw a line across the diagonal of the parallelogram
  • measure it’s length and use the scale to work out the resultant force
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12
Q

What is the equation for moment?

A

Moment of a force (N m) = force (N) x distance perpendicular to the direction of the force (m)

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13
Q

What is true of the moments in a system that is in equilibrium?

A

Sum of clockwise moments = sum of anti-clockwise moments

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