# Forces

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• Created by: Oumie
• Created on: 25-02-19 20:06
• Forces
• forces are measured in newtons(N)
• Resultant Forces
• Resultant forces is the overall force on a point or object
• Balanced and Unbalanced Forces
• Same size forces = balanced forces = object DOESN'T change
• NOT same size forces = unbalanced forces = objects WILL change
• Balanced forces has a resultant force of ZERO (total forces)
• Unbalanced forces DOESN'T have a resultant force of zero
• Forces only CHANGE what something is already doing
• Weight & Mass
• Weight
• measured in Newtons
• changes when gravity changes
• The force that gravity exerts on an object
• can be measured with a calibrated spring balance or newtonmeter
• Mass
• The amount of "matter" in an object
• The mass never changes
• Measured in kilograms (KG)
• Distance, Displacement, Speed and Velocity
• Speed
• Speed is a measure of how fast you are going
• speed is a scalar
• Distance travelled (m) = speed (m/s) x time(s)
• Speed = distance/time
• Speed is measured in m/s
• Velocity
• Velocity is a vector
• Velocity is the speed something is travelling in a certain direction
• Velocity = Distance/Time
• Distance
• Distance is just how far an object has moved
• distance is a scalar
• Displacement
• displacement is a vector
• displacement measures the distance and direction in a straight line from an object's starting point to its finishing point
• Acceleration
• Acceleration of an object is the change in its velocity per second
• Acceleration (m/s*2) = change in velocity/time taken
• to find the change in velocity you need to do Final velocity - Initial velocity/time taken
• Deceleration is a negative acceleration (when something slows down)
• Acceleration is a vector quantity because velocity is a vector
• Newton's Second Laws
• Force = Mass x Acceleration
• Greater force = Greater Acceleration (Proportional relationship)
• Greater mass = Less Acceleration (Inversely proportional relationship)