Work is defined as force multiplied by displacement and can be calculated as either W = F × s or W = F × s cos θ. Energy exists in two main forms, potential energy which is calculated as Ep = mgh, and kinetic energy calculated as Ek = 1⁄2 mv^2. Power is the rate of doing work and can be calculated as either P = W/t or P = mgh/t, while efficiency compares output to input energy or power as a percentage.

1. Work, Energy
and Power
Work
𝑾 = 𝑭 × 𝒔
𝑾 = 𝑭 × 𝒔 𝐜𝐨𝐬 𝜽
Energy
Potential
Energy
𝑬 𝒑 = 𝒎𝒈𝒉
Kinetic
Energy
𝑬 𝒌 = ½ 𝒎𝒗 𝟐
Power
𝑷 =
𝑾
𝒕
=
𝒎𝒈𝒉
𝒕
Efficiency
𝞰 =
𝑷 𝟎
𝑷 𝒊𝒏
× 𝟏𝟎𝟎%
𝞰 =
𝑬 𝟎
𝑬 𝒊𝒏
× 𝟏𝟎𝟎%