3rd nine week exam Flashcards
- definition of motion?
change in position
- average speed
total distance traveled divided by total travel time
constant speed
speed remains the same
instantaneous speed
speed of an object at a single instant of time
3.difference between speed and velocity?
speed is the time rate at which and object is moving along a path, while velocity is the rate and direction an object is moving. speed=scalar velocity=vector
- definition of acceleration
change in velocity divided by the time for the change to occur.
7.what is inertia and what does it depend on?
depends only on mass… more mass=more inertia
- Newtons 3 laws?
1st law-an object in motion will stay in motion
2nd law-force=mass*acceleration
3rd law-for every action there is an equal & opposite reaction
9.what does air resistance do to a falling object
air resistance slows down an object, depends on surface area and speed
what is the acceleration due to gravity
9.8m/s^2
11.what is the equation of newtons second law?
F=M(A)
12.path of a projectile
always a parabola. every time you throw an object into the air, it will come back in a parabolic form
13.what does the force of gravity depend on?
mass and distance
- how does gravity affect weight
the more gravity the more weight
- S.I unit for momentum?
kgm/s
16.what is acceleration
a=change in velocity divided by change in time
17.freefall?
object falling under only the influence of gravity, feels weightless
- equation for kinetic energy?
1/2mv^2 (J)
- s.i unit for energy
joule
21.law of conservation of energy?
energy is never destroyed, it can be converted or transferred, but the total amount never changes
22.what are the moon phases?
MVEMJSUN
- what is the difference between rotation and revolution?
rotation is the spinning of the earth on its axis, revolution measures years
24.how does the tilt of the earth affect the seasons?
when the earth spins on its axis it has a tilt, depending on what direction it is tilting that causes our seasons
