Unit 1

• define displacement?

  the distance (and direction) from an objects start point to its finish point
• how to work out displacement?

  pythagoras and then trigonometry
• velocity: vector/scalar?

  vector
• displacement: vector/scalar?

  vector
• weight: vector/scalar?

  vector
• mass: vector/scalar?

  scalar
• acceleration: vector/scalar?

  vector
• distance: vector/scalar?

  scalar
• time: vector/scalar?

  scalar
• speed: vector/scalar?

  scalar
• energy: vector/scalar?

  scalar
• define vector?


  a quantity that has both direction and magnitude
• define scalar?

  a quantity that has magnitude only
• define acceleration?

  the change in velocity per second
• extra uvast equation not on formula sheet?

  s = 1/2 v t
• constant velocity

  
• constant acceleration

  
• constant deceleration

  
• constant deceleration

  
• constant velocity

  
• constant acceleration

  
• constant velocity

  
• constant acceleration

  
• constant deceleration

  
• how to calculate acceleration of trolley down slope?

  1. measure width of mask
  2. record time taken for mask through lightgate
  3. v=d/t
  4. a= v-u/t
• experiment to measure acceleration due to gravity on earth?

  1. release ball from height s
  2. record time taken for ball to fall this distance
  3. plot graph of 2s against t^2 and the gradient is acceleration
• what is Newton's first law?


  an object will remain at rest or travel at a constant speed unless acted on by an unbalanced force
• what is Newtons second law?

  an unbalanced force causes an acceleration
• for an object to accelerate upwards, thrust must be greater than weight
• a rockets acceleration increases as it leaves the planet because?

  • gravitational field strength decreases
  • mass decreases as fuel is used up
• when a lift travels at a constant speed, a person experiences their true weight
• when the lift accelerates upwards, a person experiences an increased apparent weight
• when a lift accelerates downwards, a person experiences a decreased apparent weight
• Accelerating upwards can be written as decelerating downwards
• accelerating downwards can be written as decelerating upwards
• when calculating apparent weight, F=ma must be used instead of w=mg
• How to find the vertical component of a pulling force?

  x sin$\theta$
• How to find the horizontal component of a Pulling force?

  x cos$\theta$
• How to find the component of weight acting parallel to a slope?

  mgsin$\theta$
• How to find the component of weight acting perpendicular to slope?

  mgcos$\theta$