Physics P4

Formulas and key info. for P4.

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Formulas (I)

(Average) Speed (m/s) = Distance (m) / Time (s)

Momentum (kg m/s) = Mass (kg) * Velocity (m/s)

Change in Momentum (kg m/s) = Resultant Force (N) * Time force acts (s)

Kinetic Energy (joules) = 0.5 * Mass (kg) * Velocity ^ 2 (m/s)

1 of 2

Formulas (II)

Work by a force (joules) = Force (N) * Distance moved by the force (m)

Change in GPE (joules) = Weight (N) * Vertical height difference (m)

An object, when dropped loses GPE (joules) and gains the same amount of Kinetic energy (joules).

Using the KE you can fid the velocity of a falling object using the formula:

Example-

KE = 0.5 * Mass (kg) * Velocity ^ 2 (m/s)

100 = 0.5 * 2 * V ^ 2

100 = V ^ 2

   V = (Square root of) 100

      = 10

2 of 2

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