science chapter 11 7th grade

speed

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

average speed

equal the total distance traveled divided 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

acceleration

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

mass

amount of matter in an object

inertia

tendency of an object to resist a change in motion

momentum

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

laws of conservation of momentum

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

Meter

Si unit of distance, abbreviated M; equal to approximately 39.37 in

Kilogram

Si unit of mass, abbreviated kg ; equal to approximately 2.2 lbs/pounds

Triple beam balance

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