Kinematics

• What is a scalar quantity?


  A quantity that has only magnitude and no direction. E.g. Distance and speed
• What is a vector quantity?

  A quantity with magnitude and direction. E.g. displacement, velocity and acceleration.
• What are the three types of graphs that explain motion?

  Displacement time, Velocity time and Acceleration time graph
• What are the various properties of a displacement time graph?

  -slope - velocity - the y-intercept = the initial displacement- a straight (diagonal) line represents a constant velocity- a curved line represents an acceleration - a positive slope represents motion in the positive direction- a negative slope represents motion in the negative direction- a zero slope (horizontal line) represents a state of rest- the area under the curve is meaningless

  
• What are the various properties of a velocity time graph?

  -slope equals acceleration- the y-intercept equals the initial velocity- a straight line represents uniform acceleration - a curved line represents non-uniform acceleration - a positive slope represents an increase in velocity with the positive direction- a negative slope represents an increase in velocity in the negative direction.- a zero slope (horizontal line) represents motion with constant velocity.- the area under the curve = displacement or distance travelled
• What are the various properties of an acceleration time graph?

  -slope is meaningless-y intercept is initial acceleration-zero slope (horizontal slope) is object moving at constant acceleration-area under the graph represents change in velocity
• What are the 5 variables in the 4 kinematic equations?

  s=displacementu=initial velocityv=final velocitya=accelerationt=time
• How do you derive v = u + at

  
• How do you derive s=(U+V)/2 x t

  
• How do you derive s = ut + 1/2at^2

  
• How do you derive v^2 = u^2 + 2as

  
• What is the method to solving problems with kinematic equations?

  1. Write out variables that are given in the question (known and unknown), and use context of question to deduce any quantities that aren't explicitly given. e.g. for vertical motion, acceleration = +/- 9.81 ms^-22. Choose the equation which contains the quantities you have listed3. Convert any units to SI units and then insert quantities into the equation and rearrange algebraically to determine the answer.
• What are the components of an object undergoing projectile motion?


  There is a horizontal and vertical component
• What are the key terms that can come up when discussing projectile motion?

  - Time of flight : how long the projectile is in the air- Maximum Height : height at which projectile is momentarily at rest- Range : horizontal distance travelled by projectile

  
• How do you calculate the time of flight and maximum height?

  
• How do you calculate the range of projectile motion (horizontal distance travelled)?

  
• What is only force acting on a projectile after it has been released?

  Gravity