Terms to Know
Oh Yeah!
Free Falling
Looking at Graphs
100
What is the reference point where you compare an object's position to?
Origin
100
An object with a constant velocity has an acceleration of what?
Zero
100
What is the acceleration on earth due to gravity?
-9.81 m/s2
100
When is the velocity the highest.
Between 1.1 and 1.4 s.
200
What is the difference between distance and displacement?
Distance - the total number of units travelled
Displacement - the change in position between two points
200
What are the two parts of vectors?
Magnitude and direction
200
What is free fall?
uniform acceleration due to gravity
200
When is the object moving backward?
1.7 to 2.0 s
300
What always has to be constant for the equations of motion to be valid?
acceleration
300
A train is traveling at 39.5 m/s along a straight track. The engineer makes the train accelerate at -1.15 m/s2 for 38.6 s.
What is its final velocity?
-4.9 m/s
300
If you throw a lightbulb at an initial velocity of 4.30 m/s from a building 5.00 m tall, when will the lightbulb hit the ground?
1.54 s
300
What is the average velocity from 1.7 s to 2.0 s?
40 m/s forward
400
What is the difference between kinematics and dynamics?
Kinematics - how objects move (Displacement, velocity, acceleration)
Dynamics - what causes objects to move (Forces)
400
A train is traveling at 39.5 m/s along a straight track. The engineer makes the train accelerate at -1.15 m/s2 for 38.6 s.
At what point of time did the train momentarily stop?
34.3 s
400
If I were to throw up a ball with an initial velocity of 14.5 m/s upward. What is the ball's velocity when it hits the ground?
14.5 m/s downward.
400
What is the position-time graph of an object with a constant acceleration?
Answer on board
500
In what two situations could an object have a negative acceleration?
Slowing down in the forward direction
Speeding up backwards
500
A dragster starts from rest and accelerates at 13.75 m/s for 4.78 s.
What is its final velocity?
What is its displacement at the end of its acceleration?
Final Velocity: 65.7 m/s forward
Displacement: 157 m forward
500
A boy throws a ball from an initial height of 1.70 m straight up to his friend in the treehouse. He throws the ball with an initial upward velocity of 14.5 m/s.
If his friend never touches the ball, what is the maximum height that it will obtain?
12.4 m above the ground