principal of conservation of energy
Energy is neither created nor destroyed
Energy is only transferred to other forms of energy
Total energy in a system is the same.
Work done
Energy transferred usefully
It is the product of force and displacement in the direction of the force
Kinetic energy
Energy associated with the motion of an object with mass.
Gravitational Potential energy
Energy stored by an object at a point in a gravitational field.
Elastic Potential energy
Energy stored by an object as a result of a reversible change in an object’s nature.
How to increase the efficiency of a system that loses energy due to friction.
Lubricant on the system to reduce the number of parts that touch.
Newton’s first law
An object at rest or moving at a constant speed will remain at rest or moving unless acted on by an external force.
Difference between elastic and inelastic collision.
Elastic: kinetic energy before = kinetic energy after, no energy loss
Inelastic: total energy before will not equal to the total energy
Principle of conservation of momentum
total momentum before = total momentum after
Newton’s 3rd Law
It states that for every action (force) in nature, there is an equal and opposite reaction.
Why are most real life collisions inelastic?
Energy almost always converted to other forms during collision.
As a result kinetic energy is not conserved
