Intro to Kinematics Review

IP 614 Name:______

Block:_____

Date:______

Potter’s group

Kinematics Standards part I:

Distinguish between the concepts of displacement and distance.
Distinguish between vector quantities and scalar quantities.
Solve problems involving distance, displacement, average speed, average velocity, and time.
Use motion graphs to relate distance, displacement, average speed, average velocity, and time.
Identify appropriate standard international units of measurement of time (s), distance and displacement (m), speed and velocity (m/s.)

Things to remember:

Show your work when solving a numerical problem using an equation. To remember what do you need to show use the acronym STEPS:

Show what you know

Trying to find

Equation

Plug the numbers in

Solve!

When a question asks:

How long…? It is asking you to find the time (t?)

How fast…? It is asking you to find the speed or velocity (s? or v?)

How far…? It is asking you to find the distance (d?)

When you are graphing distance or position vs. time, time is always represented in the x axis and distance or position in the y axis. The slope of that line is equal to the speed.
The slope of a straight line can be calculated by: or given any two points
To calculate average speed we use:
To calculate average velocity we use:

Definitions and examples

Distance: ______

Displacement: ______

Scalars quantities: ______. Give four examples: ______, ______, ______, and ______

Vector quantities: ______. Give four examples: ______, ______, ______, and ______

Questions for you to Try: (show all your work!)

If you moved, can the distance you traveled ever be zero? Explain.

If you moved, can your displacement ever be zero? Explain.

JJ rides his skateboard at a constant speed of 5 m/s. He rides for 300 feet. How long does his ride take?

A runner runs around a circular track covers a distance of 200 m, ending in the spot where she started. If the entire trip takes her 50 seconds,

What is her average speed?

What is her average velocity?

Motion Graphs:

SLOPE. The six graphs below show data from a motion lab like the “Walk, Jog, Run.” Notice that the scales are not all the same (but all positions are in units of m, and all times are in s).
Rank these situations, from the greatest speed to the least.

Greatest1 ___2 ___3 ___4 ___5 ___6 ___Least

OR the speed is the same (but not zero) for all of these: ______

OR the speed is zero for all of these: ______

Please carefully explain your reasoning.

The six graphs below show data from a motion lab like the “Walk, Jog, Run.” Notice that the scales are not all the same (but all positions are in units of m, and all times are in s).

Rank these situations, from the greatest velocity to the least.

Greatest1 ___2 ___3 ___4 ___5 ___6 ___Least

OR the velocityis the same (but not zero) for all of these: ______

OR the velocityis zero for all of these: ______

Now rank these situations, from the greatest speed to the least.

Greatest1 ___2 ___3 ___4 ___5 ___6 ___Least

OR the speedis the same (but not zero) for all of these: ______

OR the speedis zero for all of these: ______

Please carefully explain why the rankings are not the same in the two cases.

GRAPHING: Joe and Lindsey‘s Walk

1.Graph both Joe and Lindsey’s data

2.Using the graph answer the following questions (use the space below the grid)

What is Joe’s average velocity for the first half of his trip? And for the second half? How can this difference be explained?
What is Lindsey’s average velocity for the first half of her trip? And for the second half? How can this difference be explained?
What is Joe’s average velocity for the whole trip? And his average speed?
What is Lindsey’s average velocity for the whole trip? And her average speed?

Joe / Lindsey
t (s) / x (m) / t (s) / x (m)
2.5 / 3 / 0.8 / 3
4.1 / 6 / 1.7 / 6
6.3 / 9 / 2.3 / 9
8.6 / 12 / 3.5 / 12
9.8 / 15 / 4.7 / 15
14.4 / 18 / 5.5 / 9
19.3 / 21 / 6.9 / 6
23.6 / 27 / 7.8 / 3
28.1 / 30 / 9.0 / 0