Language of Motion
Which directions are typically considered positive, and which are considered negative? Give 2 directions as an example for each.
Positive: East, North, Up, Right
Negative: West, South, Down, Left
What does uniform motion mean?
Motion at a constant speed in a straight line.
Define distance and displacement.
Distance: a scalar quantity that describes the length of a path between two points or locations.
Displacement: a vector quantity that describes how much an object’s position has changed.
What is the formula for average velocity?
Average velocity equals displacement divided by time.
Write 0.00052 in scientific notation.
5.2×10^-4
What is the difference between speed and velocity?
Speed is a scalar quantity (describes magnitude NOT direction)
Velocity is a vector quantity (describes magnitude AND direction)
Is a snowball rolling down a hill an example of uniform motion?
No, it is an example of non-uniform motion. The speed will change.
what is the formula to finding the change in position?
Change in position equals final displacement minus initial displacement.
A car moves 300 km in 3 hours. What is the average velocity?
100 km/h
Convert 3.6 x 10^3 to standard form.
3600
What is a reference point and why is it important when describing motion?
The position of an object is measured from a reference point and it helps describe if an object has moved.
Is this uniform or non-uniform motion?
A man is sitting on a bench watching birds.
Uniform
A jogger runs 3 laps around a 400m track. What is their total distance and displacement?
Distance: 1200m
Displacement: Om
A car travels 120 meters at an average velocity of 30 m/s. How long does the trip take?
4 seconds
Solve 3.42 x 2.1 to the correct number of sig figs.
7.2
Is this a scalar or vector quantity?
The temperature dropped by 10°C
Scalar (There is no direction for temperature)
What does the slope of a position vs. time graph represent
Speed
You start 3m east from the gas station and end up 9m west of the gas station. Calculate your displacement and distance.
Distance : 12m
Displacement: 6m west
A cyclist moves at an average velocity of 5 m/s forwards for 10 seconds. How far does the cyclist travel?
50 metres forwards
solve to the correct number of sig figs 12.35 + 8.4
20.8
Explain and determine the time interval for the following scenario:
You decide to bike from school to home and stop at the library on your way (your school is your origin). You want to determine the time interval to bike from the library to home. You arrive at home in 20 minutes from when you left school and it takes you 10 minutes to bike from the library from school.
Time interval is found by subtracting initial time from the final time. The initial time is 10 minutes, the final time is 20 minutes. So it takes 10 minutes to bike from the library to home.
Describe what positive, negative and zero slopes represent on a position time graph. assume that a positive position means moving to the right.
Positive: slope slants up to the right. This means that the position of the object is moving further to the right as time goes by.
Negative: slope slants down to the right, meaning that the position of the object is moving further to the left as time goes by.
Zero: slope is horizontal, meaning that the position of the object is not changing, and the object is at rest as time goes by.
Is the magnitude of displacement always the same as distance? Why or why not?
No, the magnitude of displacement is not always the same as distance because displacement is the straight-line distance from the starting point to the ending point, while distance includes the entire path traveled.
A student walks 6 m forward in 2 seconds, then 6 m back in 4 seconds. What is their average velocity?
0 m/s
The Moon is 3.84 × 10⁵ km from Earth. A spaceship travels at 9.6 × 10² km/h. How long (in hours) will it take to reach the Moon?
4.0 x 10^2 hours