Energy and Motion Flashcards

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1
Q

What are some potential sources of losses of energy?

A
  1. friction
  2. air resistance in vehicles
  3. sound energy
  4. electrical heating (NOT just heating)
  5. Work done lifting another object e.g. supports
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2
Q

What must you bear in mind during m=o.5v^2 calculations?

A

When finding velocity, make sure to find the SQUARE ROOT!

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3
Q

What does air resistance do?

A

Slows moving objects down.

Loses energy as heat.

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4
Q

Why does a train travelling up a slope have to increase its power?

A
  1. Forces act down slope (gravitational forces, weight) -> bigger total force
  2. So train needs more work done
  3. … in same time, so needs more power
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5
Q

What is the energy change when a cyclist cycles up a hill AT CONSTANT SPEED?

A

Chemical > gravitational potential

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