Science chapter 11 terms

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speed

equals the distance traveled divided by the time it takes to travel that distance

average sped

equals the total distance traveled by the total time taken to travel the distance

instantaneous speed

the speed of an object at one instant of time.

velocity

speed and direction of a moving object

meter

SI unit of distance, abbreviated m; equal to approimately

kilogram

SI unit of mass, abbreviated kg; equal to approximately 2.2 lbs

acceleration

equals the change in velocity divided by the time for the change to take place; occurs when an object speeds up, slows down, or turns

triple-beam balance

scientific instrument used to measure mass precisely by comparing the mass of a sample to known masses

mass

amount of matter in an object

inertia

tendency of an object to resist a change in its motion

momentum

a measure of how difficult it is to stop a moving object; equals the product of mass and velocity.

law of conservation of motion

states that the total momentum of objects that collide with each other is the same before and after the collision