Motion

• What is a scalar quantity?


  A quantity with only a magnitude
• What is a vector quantity?


  A quantity with both magnitude and direction
• What is the equation for average speed?

  Distance divided by time
• What is the gradient on a distance-time graph equal to?

  Speed
• What would a horizontal line represent on distance-time graph?

  stationary object
• What would a straight/sloping line represent on a distance-time graph?

  Constant speed
• Define instantaneous speed

  the speed of an object over a short interval of time
• How would you work out the gradient of a curved line?

  Draw a tangent at a single point
• Is displacement a vector or scalar?

  vector
• Name 3 other vector quantities?

  Acceleration, Force, velocity
• How is displacement measured?

  A straight line from the start point to the end point
• What is the equation for average velocity?

  Displacement divided by time
• What is the direction of a vector given by?

  an angle or bearing
• What is the gradient of a displacement-time graph equal to?

  Velocity
• Define acceleration

  The rate of change of velocity
• What are the units of Acceleration?

  ms^-2
• What is the acceleration due to gravity?

  9.81 ms^-2
• What is the negative equivalent of acceleration?

  deceleration
• What is the gradient equal to on a velocity-time graph?

  Acceleration
• What would a horizontal line on a velocity-time graph represent?

  constant velocity
• What a curved line on a velocity-time graph represent?

  changing velocity
• How would you calculate displacement from velocity-time graph?

  Work out the area below the line
• What is an equation, that uses u, v, a and t?

  v=u+at
• What equation uses s, u, t and a?

  s=ut +1/2at^2
• what equation uses s, u, v and t?

  s=1/2(u+v)t
• What equation uses v, u, a and s?

  v^2=u^2+2as
• Define Thinking distance

  the distance travelled during the reaction time
• Define braking distance

  The distance travelled under the braking force
• What is stopping distance?

  The total of braking distance add the total thinking distance
• what factors could affect stopping distance?

  Road conditions, weather, alertness of driver
• How do you calculate thinking distance?

  Thinking distance = speed x reaction time
• What factors affect braking distance?

  Weather, tyre condition, brake condition, road condition
• Define a Projectile

  A projectile is an object, that is propelled by an external force initially and is then only acted on by gravitational forces and drag
• What do we often presume is negligible in projectile motion?

  Drag
• How would you go about working out a projectile motion question?

  Separate the vertical and horizontal components
• True or False? Displacement is the total distance an object has travelled since a given time point

  False
• True or false? an object is in free fall if the only force acting on it is air resistance

  False
• Why would it be wrong to write the value of g as -9.81?

  The magnitude is independent of direction
• An object is travelling at v m/s, at an angle of 0 above the horizontal. What equation should be used to determine the horizontal component of its velocity? Assume 0=theta

  vCos0
• True or false? an object undergoing projectile motion is accelerating in both the horizontal and vertical directions

  False