Science *8

meter

SI unit of distance, abbreviated m; equal to approximently 39.37

speed

the distance traveled divided the time taken to travel the distance.

average speed

dividing the total distance traveled by the time taken.

instantaneous speed

the speed of an object at one instant of time

velocity

the speed of the object and the direction of its motion

kilogram

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

acceleration

the change in velocity divided by the time it takes for the change to occur

triple-beam balence

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

mass

the amount of matter in an object

interia

to resist a change in its motion

momentum

a measure of how hard it is to stop the object, and it depends on the objects mass and velocity.

law of conversation of momentum

the total momentum of objects that collide is the same before and after the collision.