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Summary Unit 3 | Energy
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  • Physics
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This physics note summarizes the Energy taught at the grade 11 level with covering some general key terms, equations and derivations, and solving such questions typed. This is perfect for some extra reading or studying.

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Document information

  • May 25, 2021
  • 3
  • 2020/2021
  • Summary

Subjects

  • physics
  • science
  • energy
  • equations
  • kinetic
  • forces
  • gravity
  • different
  • types
  • potential

Written for

  • Secondary school
  • 3
  • Physics
  • 1
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Energy
Notes
Kinetic Energy: Energy possessed by moving objects

(E_K) or (J)

2 Cases of Kinetic Energy
- 2 Teslas driving in diff speed, but the one driving faster will hit the same wall at a
higher force



- an apple and feather is dropped at the same height, apple will go to the ground
faster

Velocity and mass play an important role in kinetic energy

Different cases of kinetic energy
E_Kinetic = mv^2/2 <— when v_1 = 0

Kinetic E: instantaneous energy (v at that particular instant) (based on that instance in
time)

E_K = (mv^2)/2 <— the energy and velocity at that instant in time.

Work-Energy principle
W = E_final- E_initial
That's why...
W_net = [(mv_f^2)/2-(mv_i^2)/2]<— when v_1 is not 0
Or
W_net = mv^2/2 when v_1 =0

Potential Energy normally has a Reference Energy: A design level to which objects
may fall.

Potential Energy: energy state that is based on the position of the object.

E_g = mgh <— F_g is mg and h = d

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