Velocity
Acceleration
Gravitational Acceleration
Motion Basics
Math!!
Graphing
Final Jeopardy
100
What are the standard units of velocity AND the standard units of acceleration in physics?
meters per second (m/s)
and meters per second per second (m/s/s)
100
Can an object change its velocity without changing its speed? How?
turn (or change direction)
100
what does the letter "g" stand for?
acceleration due to earth's gravity
100
What do we call the point in space that we use to compare an object's position to?
reference point
100
a car drives 10 meters backward in 2 seconds. What is the velocity of this car?
-5 m/s
100
What does the slope of a velocity vs. time graph tell you?
the object's acceleration
200
Which three directions are generally defined as the negative directions in physics?
backward, leftward, and downward
200
Can an object slow down if it is accelerating in the forward direction? Describe how.
Yes! If it moving backwards while accelerating forwards.
200
A baseball, a small marble, and a bowling ball fall from a height of 10 feet. Which of these objects will have the GREATEST acceleration?
all the same! -9.8 m/s2
200
displacement is defined as a change in an object's __________.
position
200
A ball is tossed upward and moves 35 meters in 5 seconds. What is the velocity of this ball?
7 m/s
200
This graph shows an object moving forward and backwards. What is the displacement of the object at the end of this trip?
-4m
300
John runs 10 meters east in 5 seconds. Stacy runs 10 meters west in 5 seconds. Which statement is true?
a. They have the same velocity but different speeds
b. they have the same speed but different velocities
c. they both have the same speed and same velocity
d. they have different speeds and different velocities
b. Different velocities because they are moving in different directions
300
What are all the possible ways an object can accelerate?
speed up, slow down, turn / change direction
300
What does it mean for an object to be in "freefall"?
Gravity is the only force acting on the object.
300
velocity is defined as _________________.
***NOT looking for displacement divided by time.
The RATE of change in an object's position.
300
A train speeds up from 20 m/s to 65 m/s in 9 seconds. What is the acceleration of this train?
5 m/s2
300
This graph shows an object moving forward and backwards. What is the average velocity of this object? Round to ONE place after the decimal.
-0.3 m/s
400
What TWO things do you need to know about an object to accurately describe its velocity?
***NOT looking for displacement and time here
Its speed and direction.
400
An airplane moving at 100 m/s has an acceleration of -8 m/s2. How fast is the plane moving after 3 seconds?
76 m/s
400
Which of the following objects are NOT in freefall?
a. rock falling off of one story building
b. piece of paper falling off desk
c. moon orbiting earth
d. rocket while coming in for a landing
b and d (there objects are experiencing other forces aside from gravity)
400
Acceleration is defined as ____________.
The rate of change in an object's velocity.
400
A ball tossed upward slows from 30 m/s to 12 m/s in 3 seconds. What is the acceleration of this ball?
-6 m/s2
400
This graph shows an object moving forward and backwards. What is the object's velocity from 5-10 seconds?
-1.6 m/s
v = d/t = -8m/5s = -1.6 m/s
500
A dog runs forward 8 meters in 5 seconds, stops for 3 seconds, then runs backward 12 meters in 6 seconds.
What is the dog's average velocity? Round to ONE place after the decimal.
-0.3 m/s
500
Which of the following objects is NOT accelerating?
a. A car slows down on the freeway
b. A SpaceX rocket launches upward
c. You move at a constant speed of 25 m/s around a Ferris wheel
d. You jog at a constant velocity of 5 m/s east
d. All the rest are accelerating because they change speed OR direction!
500
What is the acceleration of a ball tossed straight up in the air at the moment it is at its highest point?
-9.8 m/s2
The ball is in freefall the whole time so its acceleration must be g everywhere during its flight!
500
Which of the following quantities are NOT a vector:
a. displacement
b. velocity
c. acceleration
d. gravitational acceleration
e. time
e. Time is a quantity that does not have direction.
500
A ball is dropped from a bridge and hits the ground, coming to a stop. The velocity of the ball just before hitting the ground is 67 m/s. How long was the ball falling (time)? **Round to one place after the decimal.
6.8s
500
FULLY describe what this object's motion for every section of this graph.
From 0-5 seconds, the object moves forward at a moderate speed from the origin to a position of +4m.
From 5-10 seconds, the object moves quickly backwards from +4 to -4m.
From 10-15 seconds, the object is at rest.
500
A racecar accelerates at a rate of 7 m/s2 for 4.5 seconds until it reaches a velocity of 85 m/s. What was the initial velocity of this racecar?
53.5 m/s