Define the term
Explain
Distance and Displacement
Relative Motion
Acceleration
100
Motion
Change in the position of an object with time.
100
Is it wrong to say that you are moving at different speeds?
Your speed is dependent on your reference point so you are moving at different speeds depending on what point you are comparing yourself to.
100
Which line shows distance:
Red line
100
Two objects are moving in the same direction and both are traveling at 10 m/s. What is the relative motion of one object as compared to the other?
0 m/s
100
How do you determine if an object is accelerating or decelerating on a position time graph?
By looking at how the steepness changes in the curve over time.
200
Distance and Displacement
Distance: Total length traveled during a path.
Displacement: The difference and direction between the starting and ending point.
200
How can we determine if we are moving? What do we need to state?
You must know the reference point and measure how much you move away from or towards the reference point in a certain period of time.
200
Which line shows displacement?
Blue line
200
50,000 x 4 = 200,000 km
200
Sketch how forward deceleration would look on the PT graph.
300
Speed and Velocity
Speed: The amount of distance traveled per unit of time.
Velocity: The same as speed but with direction.
300
What is the difference between relative motion and absolute motion?
Relative motion: motion that happens with respect to a reference point (constant velocity)
Absolute motion: motion that is absolutely happening (change in speed or rotation)
300
What is the distance traveled?
7 m
300
If a speed skater on a straight track starts skating at a constant speed at meter 100 at 80 seconds and ends at that speed at meter 300 at 120 seconds, what was their velocity for that part of the race?
(300-100)/(120-80)= 200/40= 5 m/s
300
Sketch how backward aceleration would look on the PT graph.
400
Scalar and Vector quantities
Scalar: Quantities that just indicate magnitude.
Vector: Quantities with both magnitude and direction.
400
What are 2 ways in which you can measure how far you travel?
Distance and Displacement
400
What is the displacement?
5 m Southwest
400
Jessica jogs on a path that is 25 kilometers long to get to a park that is south of the jogging path. If it takes Jessica 2.5 hours, what is her velocity?
25/2.5= 10 km/hr
400
A ball rolls down a ramp for 15 seconds. If the initial velocity of the ball was 0.8 m/s and the final velocity was 7 m/s, what was the acceleration of the ball?
a = (7 - 0.8)/15 = 6.2/15 = 0.41 m/s2
500
Acceleration
Change in the velocity of an object with time.
500
If an object is moving backwards, how is it represented mathematically?
With a negative sign.
500
What is the displacement?
30 mi East or -30 mi
500
What is happening to the object when you see a horizontal line on a position time graph? What about a velocity-time graph?
Position time graph: The object is not moving.
Velocity time graph: The object is moving at a constant velocity.
500
A car going 50mph accelerates to pass a truck. Five seconds later the car is going 80mph. Calculate the acceleration of the car.
a = (80 - 50)/5 = 30/5 = 6 mi/h2