Forces

• What is the name given to the single force that is equivalent to all the other forces acting on a given object?

  The resultant force.
• State Newton's first law for a stationary object.


  If the resultant force on a stationary object is zero, the object will remain at rest.
• State Newton's first law for a moving object.

  If the resultant force on a moving object is zero, the object will remain at constant velocity (same speed in same direction).
• State the defining equation for Newton's second law.

  Resultant force = Mass x Acceleration

  F = M x A
• State Newton's second law in words.

  An object's acceleration is directly proportional to the resultant force acting on it and inversely proportional to its mass.
• What is weight?

  The force that acts on a object due to gravity and the object's mass.
• What quantities does weight depend on?

  Weight = Mass x Gravitational field strength

  The objects mass. The gravitational field strength at the given position in the field.
• What is the unit used for weight?

  Newton (N)
• What is the unit used for gravitational field strength?


  N/Kg
• What piece of equipment can be used to measure an object's weight?

  A calibrated spring-balance of newton-meter.