Vectors, Scalars, & some other stuff
Force and Motion
Experimental Design Review
Graphing
Acceleration
100
a) Vectors show _______ and ______.
b) Scalars only show __________.
a) magnitude and direction
b) only one quantity
100
____ is change in position over time.
____ is a push or a pull.
Motion, Force
100
Define each of the following briefly: independent variable, dependent variable, controlled variable
IV: change on purpose to see what happens
DV: take data on this as part of your results
CV: held constant or kept the same to ensure a fair, accurate experiment
100
What does a diagonal line on a Distance vs. Time graph represent?
Constant speed away from the starting point
100
Write the Equation to find Acceleration.
Acceleration = Change in Velocity / Time
200
What is the purpose of a reference point?
To determine whether an object is in motion or changing position. To be able to describe the position of an object.
200
Describe an example of an object with balanced forces acting on it.
Could be a stationary object, or an object moving at a constant speed/velocity
200
A student wonders if shoe type affects how high someone can jump. She measures her vertical jump while wearing running shoes, boots, and socks only. She uses the same measuring method each time.
What is the IV and DV in this experiment?
IV: Type of footwear
DV: Jump height
200
What is the velocity of this object, if distance is in km and time is in minutes?
1 km/min
200
Accelerating objects change ______.
velocity (speed, direction, both)
300
Tell me if these are vector or scalar quantities:
a) 56 mph
b) 9.6 m/s2
c) 10 km/h north
a) scalar
b) vector
c) vector
300
An object has 200 Newtons pushing on it to the east and 150 Newtons pushing on it to the west.
a) Is there a balanced or unbalanced force acting on the object?
b) Would the object be in motion?
c) What would the resultant force be?
a) Unbalanced
b) Yes
c) 50 Newtons to the East
300
A student wants to know if screen brightness affects how fast a phone battery drains. She sets three identical phones to different brightness levels and plays the same video on each phone for one hour. She records the battery percentage remaining at the end.
Name the IV, DV, and controlled variables for this experiment AND describe what the "control group" should be.
IV: Screen brightness level
DV: Battery percentage remaining
Controlled variables: Same phone model, same video, same time
Control group: Phone set to the normal/default brightness
300
Draw TWO graphs that show constant velocity (velocity-time graph, distance/position-time graph). Label the x and y axis.
#1: A velocity/time graph with a flat horizontal line.
//or//
#2: A distance/time graph with a diagonal line.
300
Draw a simple graph that shows constant acceleration. Label the x and y axis.
It should be a velocity vs time graph, with a straight diagonal line (showing constant acceleration). //OR//
A position vs. time graph with a steady curve
400
Look at the vector diagram. If this event 30 seconds, what would be the:
a) speed of the moving object (in m/s)
b) displacement of the moving object (in m/s)
*dark blue line is the resultant
a) 1.23 m/s
b) 0.88 m/s, southeast OR -10.9 degrees
400
How much would this bundle of drippy PhET merch cost? Closest wins.
$99.45
400
In the Milk and Chocolate Chip Cookies Lab from the beginning of the year, what was the IV, DV, and CV?
IV: type/brand of chocolate chip cookie
DV: How good it was for dunking in milk (so could be amount of milk absorbed, how intact it stayed, etc)
CV: Time it was left in milk, how it was held in the milk, etc.
400
a) which line has the fastest velocity?
b) which line is not moving at a constant velocity?
c) On a D vs. T graph, ______ is the same as speed.
a) Line A
b) Line C
c) slope
400
Draw a velocity/time graph that shows:
a) a car traveling at constant velocity
b) then increasing its speed
c) then decelerating to zero
d) then quickly accelerating in the opposite direction
500
Super Difficult, but try. Y'all gucci smart on god drip fit!
Answer is B
500
Look at the force diagrams. Look at the net force and figure out what the value of each letter must be: 
a) 50 N
b) 200 N
c) 1100 N
d) 20 N
e) 300 N
f) 0 N (or anything, as long as same as H)
g) 50 N
h) same as f
500
CREATE YOUR OWN EXPERIMENT, but identify the IV, DV, and 2 controlled variables.
Points given based on quality!
500
A beetle is flying back-and-forth. Its velocity over time is given in the graph where rightwards is the positive velocity direction.
What is the beetle's displacement from 2s to 3s?
See slides!
3.0 m
500
Dominic Roth is in a roller coaster car, which rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, his speed is 22 m/s. What is its average acceleration?
6 m/s2 (you must include units for the points)
Acceleration = Change in Velocity / Time