Mechanics

• What is the speed equation?

  v=d/t
• What does 'v' stand for?

  Speed
• What is a definition of speed?

  The distance travelled per unit of time.
• What is the unit for speed?

  ms^-1
• Calculate the speed of... a car travels 12m in 3 seconds

  4m^s-1
• Calculate the speed of... a woman runs 100 m in 12 seconds

  8.33 ms^-1
• Calculate the speed of... a girl runs 20m in 5 seconds

  4ms^-1
• Calculate the speed of... a cat runs 50m in 8 seconds

  6.25ms^-1
• Calculate the distance of... a cat that takes 10s to gallop at a speed of 10ms^-1

  100m
• Calculate the distance of... Samantha takes 18s to run at a speed of 2ms^-1

  36m
• Calculate the distance of... Mia takes 2s to walk at a speed of 12ms^-1

  24m
• Calculate the distance of... Sachi who takes 30s to walk to a biscuit at a speed of 1ms^-1

  30m
• Calculate the time taken for... Disney to run a distance of 10m at a speed of 10ms^-1

  1s
• Calculate the time taken for... Wilbur to roll off the 15m sofa at a speed of 0.5ms^-1

  30s
• Calculate the time taken for... Mishka to walk up the 100m road at a speed of 10ms^-1

  10s
• Calculate the time taken for... Emma to run 1 m at a speed of 2ms^-1

  0.5s
• Describe the motion from this graph:

  Constant speed

  
• Describe the motion from this graph:

  Stationary

  
• Describe the motion from this graph:

  Accelerating

  
• Describe the motion from this graph:

  Higher constant speed

  
• Explain how the steepest line travels the fastest...

  It covers more distance in a shorter time.
• What is the use of the gradient in Speed:Time graphs?

  It calculates the speed of an object
• What is the formula to find out the speed? (FROM A SPEED-TIME GRAPH)Δ

  Change in the Y-axis variable/ Change in the X-axis variable
• When is the only time which the speed is 0?

  When the line is stationary
• When calculating the average speed, what do you do in each checkpoint?

  Subtract Vf-Vi
• What is the independent variable?


  The thing that was changed
• What is the dependent variable?


  The thing that is measured or observed
• What are control variables?

  Things that should be kept the same, they include anything that can affect the outcome of the investigation
• Can acceleration be positive and negative?Δ

  Yes
• What is the formula for acceleration? Δ

  a= Δv/Δt
• Work out acceleration for a change in speed of 20ms^-1 and a change in time of 2s

  10ms^-2
• What is the unit for acceleration?

  ms^-2
• Work out acceleration for a change in speed of 400ms^-1 and a change in time of 5s

  80ms^-2
• Work out acceleration for a change in speed of 96ms^-1 and a change in time of 12s

  8ms^-2
• Work out acceleration for a change in speed of 120ms^-1 and a change in time of 240s

  0.5ms^-2
• Work out acceleration for a change in speed of 1300ms^-1 and a change in time of 50s

  26ms^-2
• Work out change in time using a change in speed of 9ms^-1 and an acceleration 3ms^-2

  3s
• Work out change in time using a change in speed of 300ms^-1 and an acceleration 60ms^-2

  5s
• Work out change in time using a change in speed of 21ms^-1 and an acceleration 14ms^-2

  1.5s
• Work out change in time using a change in speed of 48ms^-1 and an acceleration 0.96ms^-2

  50s