Hewitt Ch 3 Flashcards
1
Q
A
2
Q
The amount of matter in an object.
A
Mass
3
Q
kilogram
Is a unit of?
A
Mass
4
Q
newton
Is a unit of?
A
Force
5
Q
meter
Is a unit of?
A
Distance
6
Q
inch
Is a unit of?
A
Distance
7
Q
kg m/sec
Is a unit of?
A
Momentum
8
Q
grams x miles/hr
Is a unit of?
A
Momentum
9
Q
m/(s x s)
Is a unit of?
A
Acceleration
10
Q
m/s2
Is a unit of?
A
Acceleration
11
Q
m/s
Is a unit of?
A
Speed
12
Q
m/s - North
Is a unit of?
A
Velocity
13
Q
miles/hr
Is a unit of?
A
Speed
14
Q
cm/day
Is a unit of?
A
Speed
15
Q
miles East
Is a unit of?
A
Displacement
16
Q
miles/hr - West
Is a unit of?
A
Velocity
17
Q
m/s SouthEast
Is a unit of?
A
Velocity
18
Q
Pounds
Is a unit of?
A
Force
19
Q
kiloNewtons
Is a unit of?
A
Force
20
Q
milliNewtons
Is a unit of?
A
Force
21
Q
A force is a
A
Push or a Pull
22
Q
Normal Force means a force ___________ to a surface
A
Perpendicular
23
Q
Normal
A
Perpendicular
24
Q
Another way to say perpendicular
A
Normal
25
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.
26
Definition of Mass
The amount of matter in an object.
(Each time you add an atom to an object, you add mass)
27
Definition of Weight
The force of gravity upon an object.
28
Mass and Weight mean ____________ things.
Different
29
Formula for finding Weight
Weight = ___________ x \_\_\_\_\_\_\_\_\_\_\_\_
Weight = mass x gravity
30
What is this thing?
(scroll down and look at entire picture)
Your secret weapon to get 4 questions right on the upcoming test.
31
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
32
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.
33
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.
34
What can this thingy tell you about weight?
Weight is a force.
40
The force of gravity upon an object
weight
41
Two definitions of acceleration
Change in speed or direction
or
Change in Velociy
42
Formula for acceleration
Accleration =
Acceleration = change in velocity/change in time
can also be written as:
a = Δv / Δt
43
Mass means pretty much the same thing as \_\_\_\_\_\_\_\_
Inertia
44
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.
45
Gravitational Field Strength near the Earth's surface
9.8 newtons/kilogram
46
What are these things?
Ball Bearings
47
The word "static" means....
at rest
48
Static Friction means
The force of friction preventing a motionless object from moving.
49
Sliding Fricition means...
The force of friction impeding the motion of an object sliding across a surface.
50
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)
51
You can reduce the friction between to sliding surfaces by coating the surfaces with a \_\_\_\_\_\_\_\_\_\_\_\_\_\_.
Lubricant
(oil, grease. etc)
53
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.
54
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.
55
Interaction
When two objects have an effect upon each other.
56
Three most common types of interaction
Touch
Gravity
Friction
