Explaining motion P4 Questions/Answers. Question 1 What is the name used to describe a pair of forces?

Explaining motionExplaining motionP4P4

Questions/AnswersQuestions/Answers

Question 1Question 1

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

AnswerAnswer

Interaction pairInteraction pair

Question 2Question 2

Which of these are not true about Which of these are not true about interaction pairs of forces?interaction pairs of forces?

A) always equal in sizeA) always equal in size

B) opposite in directionB) opposite in direction

C) act on different objectsC) act on different objects

D) one of them is always frictionD) one of them is always friction

AnswerAnswer

Answer D – one of Answer D – one of them is always friction.them is always friction.

Question 3Question 3

Write down the Write down the equation to calculate equation to calculate speed.speed.

AnswerAnswer

Speed = Distance / TimeSpeed = Distance / Time

Question 4Question 4

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

AnswerAnswer

30m/min30m/min

andand

0.5m/s0.5m/s

Question 5Question 5

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

AnswerAnswer

time

distance

Question 6Question 6

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

AnswerAnswer

SpeedSpeed

TimeTime

Question 7Question 7

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

1010

mphmph

velocity

time

AnswerAnswer

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

Question 8Question 8

TRUE or FALSETRUE or FALSE

If two objects have different If two objects have different masses, the heavy one moves masses, the heavy one moves faster than the light one?faster than the light one?

AnswerAnswer

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

Question 9Question 9

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

AnswerAnswer

10000kg m/s10000kg m/s

Question 10Question 10

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

AnswerAnswer

15000J15000J