SPM Physics :FAST Facts You Should Know About Chapter 2 Form 4!!
Compiled by cikgufizik @ www.physics4spm.com
FAST Facts about Speed & Velocity
- Speed, distance [d], time, and energy (joules) are scalar quantities.
- Speed is rate of change of distance, i.e = distance/time
- The gradient of distance-time graph is a speed.
- Velocity, displacement [s], momentum, force and acceleration are vectors.
- Velocity is the rate of change of displacement, i.e = displacement / time
- The gradient of the displacement-time graph is also the velocity.
FAST Facts about Forces & Acceleration
- Acceleration is the rate of change of velocity.
- The gradient of the velocity-time graph is also the acceleration.
- Zero acceleration also means either the object is at rest or moving at constant velocity.
- Weight (in newtons) is mass x gravitational acceleration (w = mg). Mass is not weight!
- Unbalanced forces will produce acceleration, i.e object not in equilibrium
- Constant velocity and zero velocity means the net force is zero and the forces are in equilibrium
- The equilibrium forces is equal in magnitude but opposite in direction to the resultant vector.
FAST Facts about Momentum
- Momentum is a product of mass & velocity.
- Momentum is conserved in all collision systems.
- Total momentum before collision = total momentum after collision
- Rate of change of momentum over time is an impulsive force. ( mv-mu) /t
- Change in momentum is an impulse (mv-mu)
FAST Facts about POWER & ENERGY
- Energy is a work done.
- Energy is a scalar qty.
- Energy can't be created or destroyed by human.
- Energy can only be transformed.
- Total energy dring the transformation is constant. (Total initial energy = Total final energy)
- Gravitational potential energy increases as height increases.
- Kinetic energy changes only if velocity changes.
- Eleastic potential energy of the spring increases as the extension or compression of the spring increase.
- The units for power are [joules/sec] or Watt (W).
- Power is the rate of work done
- 1 watt is 1 joule of work being done in 1 second.
April 6, 2010 10:44 PM
This is very useful ^^ thanks ~
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