We have already covered some of the basics of the difference between the words position, distance, displacement, speed and velocity. Read pages 18-31 in your book. This mostly covers some of the same material in a little more depth. Is there anything in here that you have questions about?
You are travelling at a constant velocity of 40 miles per hour for 7 hours. to determine how far you have driven, which of the following equations would you use?
How far did you drive?
Velocity and speed use the same units. which of the following are acceptable units for both speed and velocity?
I want you to compare the equation you chose for question 2 and units you chose for question 4. what do you notice?
grandma's house is 370 miles away. You know you will average 75 miles per hour on the drive. how long should it take you to go to grandma's house?
If something is at rest then its velocity is
If something is accelerating then the velocity is changing and a constant rate. We will never deal with a non-constant acceleration in this class. So from here on, the acceleration is going to be some number "a".
lets keep that number simple and say that a= 1 m/s
if something starts at rest we use the equation
but if you throw something the equation changes. it becomes
what do you think the
Watch the following video on graphing 1 D motion. Do you have any questions?
Describe the movement given in this graph.
(note: the x-axis, the horizontal axis is time, and the y-axis is the position with respect to the front door)
If this graph was being walked outside flipping physics' guy's house, would you ever be to the left of door? if so, when? if not, how do you know?
the line does not start at at y=0, it starts in the negative. What does that mean?
What are some easy mistakes you can see yourself making in interpreting these graphs?
We discussed frame of reference in class. What is the frame of reference for all of the flipping physicists walking diagrams? What doesn't move?
What do you mean the frame of reference bit made no sense? we talked about narcissists and only children and... oh. I see your point. Ok, this video is short, and explains things better.
So if you are on a train and are throwing a ball straight up in the air, from your perspective the ball is
So you are on a train and are throwing a ball straight up in the air. your friend is watching you leave on the train from the station platform. He sees
Rosa's boat is paddling upstream at 125 cm/s relative to the water in a river which is flowing at 50 cm/s relative to the banks of the river. if you are on the bank of the river, how fast does Rosa's boat appear to be moving?
you are in a car going 30 mph and a car passes you, from your frame of reference, the car is going 5 mph. how fast is the car going relative to the ground?
Another car wizzes past you going the opposite direction. looked like he was going 100 mph. How fast do you think he was going?