______________ is a science word. It is used to sort of describe how much of an impact an object might make in a collision.
Momentum = Mass x Velocity
Definition of Mass
The amount of matter in an object.
(Each time you add an atom to an object, you add mass)
Definition of Weight
The force of gravity upon an object.
Mass and Weight mean ____________ things.
Formula for finding Weight
Weight = ___________ x ____________
Weight = mass x gravity
What is this thing?
(scroll down and look at entire picture)
Your secret weapon to get 4 questions right on the upcoming test.
What can this tell you about mass and weight?
The Earth's gravity applies a force of
9.8-Newtons to a 1-kg mass
If you took this thingy to the moon and looked at it, the mass would _______________?
Stay the same.
The 1-kg label on th object will still say 1-kg, and it will still be correct.
If you took this thingy to the moon and looked at it, the weight would _______________?
The moon has less gravity, so the red needle would only point to about 2.
What can this thingy tell you about weight?
Weight is a force.
The force of gravity upon an object
Two definitions of acceleration
Change in speed or direction
Change in Velociy
Formula for acceleration
Acceleration = change in velocity/change in time
can also be written as:
a = Δv / Δt
Mass means pretty much the same thing as ________
If there is no air friction, which would experience a greater acceleration when dropped off a cliff, a large rock or a small rock?
Neither, both would accelerate at the same rate, and both would reach the ground at the same time.
Gravitational Field Strength near the Earth's surface
The word "static" means....
Static Friction means
The force of friction preventing a motionless object from moving.
Sliding Fricition means...
The force of friction impeding the motion of an object sliding across a surface.
The force of friction impeding the motion of an object fighting its way through the air.
(It has to bump the air molecules out of the way)
You can reduce the friction between two sliding surfaces by coating the surfaces with a ______________.
(oil, grease. etc)
What are these things?
(You have these on your bicycle, on your skateboard, inline skates, cars, etc.)
(These are what allow wheels to roll with very little friction.)
What would happen to your mass if you left Earth and went to Jupiter?
Mass is a measure of how much "stuff" or matter there is in an object.
What would happen to your weight if you left Earth and went to Jupiter?
Your weight would go up.
Jupiter has a much stronger gravitational field than the Earth. Weight is the pull of gravity upon an object.
When two objects have an effect upon each other.
Three most common types of interaction
What does this stand for?
Sum of Forces
Sum of Forces, or ΣF, means the same thing as:
The force impeding the motion of an object scraping across a surface or plowing through the air.
The force impeding the motion of a moving object.