motion

• Speed = distance / time
• Velocity is the rate at which an object changes position, measured as displacement per unit time.
• Velocity is speed with direction.
• Acceleration is the rate at which velocity changes.
• The equation for acceleration is change in velocity divided by time taken to make that change.
• acceleration= a.ve=Vf-Vi/t, where Vf= final velocity and Vi= initial velocity
• m/s)/s (or m/s2) and (km/h)/s (or km/h·s) are units of acceleration. Which is also velocity/time.
• Acceleration Due to Gravity (g): g=9.81 m/s²
• The Mass of an object is traditionally defined as a measure of the inertia of the object.
• Inertia is the tendency of a body at rest to remain at rest, and of a body in motion to continue moving with unchanged velocity.
• A kilogram is equal to one thousand grams.
• Another unit used to measure mass is the tonne, which equals 1000 kg.
• Force, in general, is the agency of change. In mechanics it is that which changes the velocity of an object. Force is a vector quantity, having magnitude and direction. An external force is one whose source lies outside of the system being considered.
• The Newton is the SI unit of force. One newton (1 N) is that resultant force that will give a 1-kg mass an acceleration of 1 m/s2. The pound is 4.45 N, or alternatively a newton is about a quarter of a pound.
• Newton’s First Law: a body at rest or in uniform motion will remain in that state unless compelled by an external force to do so.
• Newton's second law of motion states that F = ma, or net force is equal to mass times acceleration. 
• Newton's third law of motion: When two objects interact, their forces on each other are equal and opposite.
• universal gravitation:

  
• Law of conservation of energy: Energy cannot be created or destroyed, only transferred from one form to another