To calculate the average speed, you must
a) add distance and time
b) subtract the total amount of distance and by the total amount of time
c) add speed plus direction
d) divide the total amount of distance by the total amount of time
d) divide the total amount of distance by the total amount of time
A place or object used for comparison to determine if an object is in motion is called
a) reference point
b) constant speed
c) velocity
d) distance
a) reference point
Based on the distance-time graph of a race pictured above, who won the race?
Person A
Radio signals travel through space at a speed of 300,000 km/s. A signal sent from a space probe near Mars takes 780 seconds to reach Earth.
Calculate, in kilometers, how far the space probe is from Earth.
d = 234,000,000 km
A bicycle is moving at a constant velocity of 8 m/s. How much time does it take for the bicycle to cover a distance of 80 meters? How much distance will the bicycle cover in 1 minute?
t = 10 s
d = 480 m
What would the displacement-time graph of no motion look like?
a) a horizontal line
b) the slope of the line increasing steadily
c) the slope of the line decreasing steadily
d) the line of the graph would increase and decrease.
a) a horizontal line
What is the difference between a position-time graph and a displacement-time graph?
No difference, it is two names to describe the same graph (trick Q!)
Who fell down during the race, and at what time did she fall down, based on the distance-time graph of a race pictured above?
Person C at t = 6s
On another planet, the acceleration due to gravity is 20 m/s2. If I drop an object from rest on that planet, what will its velocity be after 6 seconds?
vf = -120 m/s
A car is moving at an initial velocity of 10 m/s. It crashes into a brick wall, coming to a complete stop. If the crash crumples the car by 3 m, calculate the sudden deceleration of the car.
a = -16.67 m/s2
Distance is always...
a) Equal to displacement
b) Greater than or equal to displacement
c) Less than or equal to displacement
d) Negative if you travel backward
b) Greater than or equal to displacement
Why is it possible to have zero average velocity and yet have a non-zero value for average speed?
If the displacement is zero, and the distance traveled is not zero, this means that an object moved in a path leading to its return to the starting point.
Ainsley is walking her dogs. She walks them 50 m to the right, then the dogs tug her back 50 m to the left. She then pulls the dogs back to the right, moving 70 m.
Draw Ainsley’s path during her walk and compute her total distance and displacement.
d = 170
ΔX = 70
Julia and Aditi are playing miniature golf. Julia's ball rolls into a long, straight upward incline with an initial velocity of 2.95 m/s and accelerates at -0.876 m/s2 for 1.54 seconds until it reaches the top of the incline. Determine the length of the incline.
d = 3.5 m
A linear plot on a velocity/time graph shows ________ acceleration
constant
What is the difference between average speed and average velocity?
a) they are the same
b) average speed is the magnitude of average velocity
c) average speed is distance/time and average velocity is displacement/time
c) average speed is displacement/time and average velocity is distance/time
c) average speed is distance/time and average velocity is displacement/time
The slope (rise/run) of a position versus time graph represents what value?
a) velocity
b) distance
c) acceleration
d) position
a) velocity
If an object’s velocity vs. time graph crosses the time axis, what happens at that moment?
a) It stops moving permanently
b) It reverses direction
c) It keeps going with same direction
d) Its acceleration becomes zero
b) It reverses direction
A car accelerates uniformly in a straight line from 10 m/s to 20 m/s in 5 seconds. What is the acceleration?
a = 2 m/s2
Draw a position-time graph of a car moving 10 m forward in 5 seconds, stopping for 5 seconds, then driving 10 m back to its starting point in 5 seconds.
Then draw the resulting position-time and velocity-time graph.
The first person to buzz draws the graph(s) on the whiteboard.
Where on this velocity-time graph is the bus accelerating? (May be more than one)
* O-A
* A-B
* B-C
* C-D
* D-E
* E-F
O-A & D-E
Match the units to the quantities:
Quantity: distance, time, velocity, acceleration
Units: m/s, m/s2, m, s
distance (m)
time (s)
velocity (m/s)
acceleration (m/s2)
An object has negative velocity and negative acceleration. What is happening?
a) It is speeding up in the negative direction
b) It is slowing down in the negative direction
c) It is moving forward faster
d) It is standing still
a) It is speeding up in the negative direction
You are climbing a tree branch and fall down, hitting the ground in 2 seconds. Calculate how far you have fallen.
d = 11.025 m
Draw the shape of a position-time graph for each situation:
* object moving forward at a constant velocity
* object moving backward at a constant velocity
* object accelerating
* object decelerating
* object staying still in place
The first person to buzz draws the graph(s) on the whiteboard.