Hewitt Ch 3 Flashcards
The amount of matter in an object.
Mass
kilogram
Is a unit of?
Mass
newton
Is a unit of?
Force
meter
Is a unit of?
Distance
inch
Is a unit of?
Distance
kg m/sec
Is a unit of?
Momentum
grams x miles/hr
Is a unit of?
Momentum
m/(s x s)
Is a unit of?
Acceleration
m/s2
Is a unit of?
Acceleration
m/s
Is a unit of?
Speed
m/s - North
Is a unit of?
Velocity
miles/hr
Is a unit of?
Speed
cm/day
Is a unit of?
Speed
miles East
Is a unit of?
Displacement
miles/hr - West
Is a unit of?
Velocity
m/s SouthEast
Is a unit of?
Velocity
Pounds
Is a unit of?
Force
kiloNewtons
Is a unit of?
Force
milliNewtons
Is a unit of?
Force
A force is a
Push or a Pull
Normal Force means a force ___________ to a surface
Perpendicular
Normal
Perpendicular
Another way to say perpendicular
Normal
How can you determine the direction in which friction acts upon a moving object
Friction will act in the direction opposite of the motion of the object.
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.
Different
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 _______________?
Go down.
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
weight
Two definitions of acceleration
Change in speed or direction
or
Change in Velociy
Formula for acceleration
Accleration =
Acceleration = change in velocity/change in time
can also be written as:
a = Δv / Δt
Mass means pretty much the same thing as ________
Inertia
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
9.8 newtons/kilogram
What are these things?
Ball Bearings
The word “static” means….
at rest
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.
Air Friction
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 to sliding surfaces by coating the surfaces with a ______________.
Lubricant
(oil, grease. etc)
What would happen to your mass if you left Earth and went to Jupiter?
Nothing.
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.
Interaction
When two objects have an effect upon each other.
Three most common types of interaction
Touch
Gravity
Friction
