physics

• Distance is a scalar quantity given by how far an object has moved in total. Measured using metres.
• Displacement is a vector measurement. Displacement is the shortest distance between an object's starting and finishing points.
• Vector measurements = distance + direction
• Time is measured in seconds
• Main difference between distance and displacement = Distance is scalar, displacement is vector.
• Positive acceleration is when speed increases.
• Negative acceleration is when speed decreases.
• Acceleration happens when A. Velocity increases or decreases B. Velocity changes direction!
• This symbol represents speed = v

  
• distance = speed X time
• Speed = distance / time

  
• Time= distance / speed
• velocity: The rate at which an object's position is changing complete with the given direction.
• Difference between speed & velocity is velocity is vector, speed is scalar.
• Displacement is represented by "S"
• If a bike rider travels 4km east, and then turns and goes back west 2km, complete this calculation....

  S= 4km - 2km
• To calculate the average speed of an object I would do this:

  average speed= distance

  / time D Over T

  average velocity= displacement

  /time
• Formula to measure average speed of ticket timer section is..

  (length of section) / 0.1
• Displacement-time graph formula for velocity=

  V=rise

  /run
• The gradient of a displacement-time graph represents velocity.
• acceleration= change in velocity / change in time 
• Write the acceleration measurement:
• A runner slows from initial 2.5 m/s sq to 1.5m/s sq in 10 seconds,

  The negative acceleration is

  2.5m-1.5m

  / 10s

  =0.1m/s sq
• formula for change in acceleration?

  initial acceleration-other acceleration /time taken
• initial velocity = u
• acceleration= a
• difference in time=time
• This is the formula for acceleration

  
• Multiplying both sides of acceleration formula by time (Δ𝑡) produces: a×Δt=v−u
• To find final velocity, this is the formula v=a×Δt+u
• An object has an initial velocity of 42 m/s sq, and accelerates at 8 m/s sq for 5 seconds.

   final velocity formula = 8 x 5 + 42