Q4

• The Law of Acceleration - ●The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, and inversely proportional to the mass of the object.
• Uniformly Accelerated Object - UAM
• Constant Acceleration - Type of Motion in which velocity of an object changes by an equal amount in every time period.
• Uniformly Accelerated Object - When an object is travelling in a straight line with an increase in velocity at equal intervals of time
• The Acceleration due to gravity is 9.8m/s2 neglecting air resistance.
• Free Fall - When an object falls freely under the influence of gravity alone without any other forces acting on it.
• Projectile - An object undergoing projectile motion.
• Trajectory - The arc/curve-like motion-path undergone by the projectile.
• angle(θ) - A numerical value in degrees(°) expressing the orientation of the projectile to be throw/projected.
• Projectile motion is a form of motion where an object moves in a curved path
• Projectile


  The object that is thrown or projected and exhibits projectile motion
• Trajectory


  The curve-like path undertaken by a projectile
• Projectile motion consists of horizontal and vertical motion working independently
• Horizontal motion

  No resistance in any form

  Constant horizontal velocity (vx)

  Horizontal acceleration is zero

  Horizontal distance is called range (dx)
• Vertical motion


  • Force acting is gravity (g or ay)
  • Constant acceleration due to gravity (-9.8 m/s^2)
  • Vertical velocity is not constant (vy)
  • Vertical distance is called height (dy)
• Solving a problem on horizontal launched projectile

  1. Given: Horizontal distance (dx), Initial velocity (vi), Acceleration due to gravity (g)

  2. Find: Height of table (dy), Final velocity (vf)

  3. Step 1: Calculate time using dx and vi

  4. Step 2: Use time to calculate dy using formula: dy = 1/2 * g * t^2

  5. Step 3: Use dy to calculate vf using formula: vf = sqrt(2 * g * dy)
• Projectile motion can be observed in both horizontal and angle-launched scenarios
• Examples of projectile motion


  • A man diving into water
  • A sepak takraw player kicking a rattan ball over the net
• The trajectory of a projectile follows a parabolic path
• Range - Distance travelled horizontally from the point where the projectile was thrown or projected.
• Height - Maximum height reached by the projectile above its starting position.
• Acceleration - Rate of change of velocity, measured as a vector quantity with magnitude and direction.