Explaining motion P4

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Explaining motionP4

• Questions/Answers

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Question 1

• What is the name used to describe a pair of
  forces?

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Answer

• Interaction pair

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Question 2

• Which of these are not true about interaction
  pairs of forces?
• A) always equal in size
• B) opposite in direction
• C) act on different objects
• D) one of them is always friction

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Answer

• Answer D one of them is always friction.

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Question 3

• Write down the equation to calculate speed.

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Answer

• Speed Distance / Time

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Question 4

• If car has travelled 3000m in 100 minutes what is
  its speed in m/min and m/s?

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Answer

• 30m/min
• and
• 0.5m/s

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Question 5

• Sketch a distance time graph to show a car
  starting from stationary, travelling at a
  constant speed and then stopping.

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Answer
distance
time
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Question 6

• Sketch a speed time graph to show a car
  accelerating, then travelling at a constant
  speed, then slowing down to stop.

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Answer

• Speed
• Time

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Question 7

• Describe what is happening during the journey in
  this velocity time graph.
• 10
• mph

time
velocity
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Answer

• The object is travelling at a velocity of 10mph
  then begins to slow down, it stops for a moment
  (intersection on x axis) then goes backwards.

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Question 8

• TRUE or FALSE
• If two objects have different masses, the heavy
  one moves faster than the light one?

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Answer

• FALSE the heavier object moves slower than the
  light one.

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Question 9

• Calculate the momentum of a lorry of a mass
  5000kg travelling at 2m/s.

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Answer

• 10000kg m/s

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Question 10

• Calculate the work done by a man pushing a car
  25m along a road if he pushes with a force of 600N

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Answer

• 15000J