What is a scalar quantiy? - A quantity that has only magnitude., What is a vector quantity? - A quantity that had both magnitude and associated direction., What is a force? - A push or a pull on an object due to an interaction with another object., what is the equation used to calculate work done? - work done = force x displacement, explain the relationship between the force applied and the extension of an elastic object. - the extension is directly proportional to the force applied, provided that the limit of proportionality is not exceeded, state the relation connecting force, spring constant and extension. - force = spring constant x extension, What type of energy is stored in a spring when it is stretched? - Elastic potential energy, State an equation to calculate an object's momentum - Momentum = Mass x Velocity, State the law of conservation of momentum - In a closed system, the total momentum before collision is equal to the total momentum after collision., SI Unit of momentum - Kgm/s,

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