forces and momentum

• F = m a is Newton's second law
• The acceleration of F = m a is in the same direction as the net force
• momentum is a vector quantity
• For momentum direction is the same as the velocity of the object.
• Inelastic collisions result in objects sticking together or bouncing off at different speeds.
• for force acceleration is directly proportional to force
• With forces, acceleration is directly proportional to 1/m
• F(t) is called impulse of the force
• Impulse causes the momentum to change.
• When two objects collide they exert equal but opposite forces on one another.
• Unit for momentum is kgms-1 or sN
• The equation for momentum is p=mv
• Inelastic collision is where kinetic energy is lost due to deformation of the object.
• Momentum is conserved when there are no external forces acting on an object.
• Elastic collision is when there is no loss of kinetic energy, so it's conserved.
• The total momentum of all particles in an isolated system remains constant despite any interactions between the particles.
• isolated system = no external unbalanced forces
• For multi-image representations, distance between successive images is a measure of speed
• In multi-image representations, line joining two successive images represents magnitude and direction of velocity vector.
• total energy in an isolated system is conserved.
• Energy can be transformed or transferred.
• Energy is measured in joules.
• Energy is a scalar quantity and does not have direction
• Kinetic Energy = 1/2 x mass x velocity^2
• Potential Energy = Mass x Gravitational Field Strength x Height
• Three types of collision are elastic, inelastic and perfectly inelastic.
• elastic collisions have no kinetic energy is lost and momentum is conserved
• inelastic collisions some kinetic energy is lost but momentum is still conserved
• Newton's first law: An object will remain at rest or will remain in motion unless acted upon by a resultant force
• Newton's second law: The force on an object is equal to its mass times its acceleration.
• Newton's third law: for every action there is an equal and opposite reaction.
• Solar Sail is the acceleration of solar sails by the reflection of light particles (called photons)
• Change in velocity causes acceleration and therefore there is a force provoided.