# Forces Revision

• Created by: MustafzYT
• Created on: 27-01-18 15:45
• Forces Revision
• Vector Quantites
• Force
• Measured in Newtons (N)
• Velocity
• Displacement
• Acceleration
• Equation: Change of velocity/Time taken.
• Unit of measurement:m/s^2
• Momentum
• Momentum = Mass x Velocity
• Vectors are represented by arrows and the length being the magnitude and the direction shows the direction of the object
• Scalar Quantites
• Speed
• Distance
• Mass
• Mass is measured in kilograms
• Temperature
• Time
• Time is measured in seconds.
• Contact Force
• Friction
• Air Resistance
• Tension in ropes
• Normal contact force
• Non-Contact Force
• Magnetic Force
• Gravitational Force
• The gravitational force here on Earth is 9.8N/kg
• Electrostatic Force
• Newton's Laws
• Newton's First Law
• If there is no force, there is no change in velocity
• Newton's Second Law
• The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
• Newton's Third Law
• For every action, there is an equal and opposite reaction
• Equations
• Weight(N)=Mass(kg) x Gravitational Field Strength
• Distance(m) = Speed(m/s) x Time(s)
• Momentum = Mass x Velocity
• Work done(J) = Force(N) x Distance(m)
• Force = Spring Constant (N/m) x Extension(m)
• Resultant Force = Mass x Acceleration.
• Good old facts?
• Weight and Mass are directly proportional!
• The centre of mass is the place you think most of the mass is concentrated in.
• Good old facts?
• Weight and Mass are directly proportional!
• The centre of mass is the place you think most of the mass is concentrated in.
• Weight is a force and Mass is what is measured by kilograms always!
• Weight is a force and Mass is what is measured by kilograms always!
• Forces and Elasticity
• Elastic Deformation
• An object has been elastically deformed if it can return into shape.
• Inelastic Deformation
• An object has been inelastically deformed if it cannot return back into shape