Physics - Dynamics & Space

Vectors and Scalars
1. Scalars have magnitude only
  1. Speed
  2. Distance
  3. Mass
  4. Energy (kinetic too!!!)
2. Vectors have magnitude and direction
  1. Velocity (v=s/t)
  2. Displacement (s)
  3. Acceleration (a=[v-u]/t)
  4. Force (F=ma)
  5. Weight (W=mg)
Instantaneous Speed
1. Measured over very short distances or time intervals
2. Light Gate Experiment
  1. Instantaneous Speed = length of card / time light beam is broken
Average Speed
1. Measured over longer distances or time intevals
Newton's Laws of Motion
1. Newton's 1st Law of Motion
  1. An object will remain at rest or at a constant speed in the same direction unless acted upon by an external unbalanced force
2. Newton's 2nd Law of Motion
  1. Force = mass x acceleration
    1. F=ma
3. Newton's 3rd Law of Motion
  1. For every action there is an equal and opposite reaction
  2. If A exerts a force on B, then B exerts an equal and opposite force on A.
Projectiles
1. Projectile motion is viewed as two separate motions
  1. Horizontal
    1. The projectile remains at a constant speed horizontally. Excluding air resistance, there are no forces acting upon the projectile.
  2. Vertical
    1. The projectile accelerates downwards at 9.8 m/s^2 due to weight (the force due to gravity)
2. The projectile follows a curved path because it is travelling at a constant speed horizontally, but accelerating vertically downwards at the same time.

Resource summary

	Created by sstead98 about 10 years ago