Forum login

Not registered? Sign-up here it's free.

External links

• NCEA on TKI
• NZQA website

Physics 2.4 Demonstrate understanding of mechanics

Subject content

Revise your NCEA level one work about force and motion.

Recall the work on vectors.

Make sure you have up-to-date notes. You may be tested on the following phenomena, concepts and principles:

• Motion:
  • relative motion
  • change in velocity
  • velocity vector components
  • constant acceleration in a straight line
  • free fall under gravity
  • projectile motion (you can try this interactive animation to observe a projectile motion when you change velocity, angle and/or mass)
  • circular motion (constant speed with one force only providing centripetal force).
  
  Check out analysing motion using graphs and equations.
  
  Relationships or formulae you need to know to apply to solve a problem about motion:
  
     
  
  v_f = v_i + at  
  
    v_f ² = v_i ² + 2ad
  
  
  
  
• Force:
  • force components
  • vector addition of forces
  • unbalanced force and acceleration
  • equilibrium (balanced forces and torques)
  • centripetal force
  • force and extension of a spring.
  
  Relationships you need to know to apply to solve a problem about forces:
  
  F = ma    t = Fd
  
  F = - kx   
  
  
• Momentum and energy:
  • momentum
  • change in momentum in one dimension and impulse
  • impulse and force
  • conservation of momentum in one dimension
  • elastic and inelastic collisions
  • work
  • power
  • conservation of energy
  • elastic potential energy.
  
  Relationships you need to know to apply when solving a problem about momentum and energy:
  
  p = mv         
  
  E_p = ½kx²   E_k = ½mv²   DE_p = mgDh  
  
  W = Fd        
  
  Check out this revision on forces – about Newton’s laws and energy, work, and power.

Back to top