Force: The unit of forces the Newton (N) where one newton is one-kilogram meter per second squared. Thus, force, in Newton's 𝑭 = 𝒎𝒂 Where m is the mass in kilograms and a is the acceleration in meters per second squared. Gravitational force, or weight, is mg, where 𝒈 = 𝟗. 𝟖𝟏 𝒎/𝒔 𝟐 . Example: A mass of 5000 g is accelerated at 2 m/s2 by a force. Determine the force needed? Force = mass x acceleration = 5kg x 2m/s2 = 10 kg m/s2 = 10 N. Work: The unit of work or energy is the joule (J) where one joule is one Newton meter. Thus work done on a body, in joules, W=Fs where F is the force in Newton's and s is the distance in meters moved by the body in the direction of the force. Power: The unit of power is the watt (W) where one watt is one joule per second. Power is defined as the rate of doing work or transferring energy. Thus, power, in watts, P = W/t, where W is the work done or energy transferred, in joules, and t is the time, in seconds. Thus, energy, in joules, W=Pt
