Physics Assignment #3

Open the page here in a new window to do the following:

1. What is the acceleration of the car in the first graph?
2. How can you calculate the velocity of an object from its position vs time graph?
3. Scroll to the bottom of the page and try Practice A. Look at the answer provided to check if you are understanding it. Now try Practice B and without looking at the given answer write down your description.

Open the page here in a new window to do the following:

4. Which car is traveling with greater speed? How can you see this only by looking at the graph?
5. In words describe what point on the graph represents when the red car passes the blue car? At what time and position does this occur?
6. At what time is the blue car at a position of 20 m? The red car at 120 m?.

Open the page here in a new window to do the following:

7. Make sure that the bee has been set to have zero external force, zero angle of force and zero initial velocity.  Try different values of mass but keep the angle the same.  (You must click on “Update Initial Information” to complete the changes.)  What do you notice about the time it takes for the bee to slide down the incline as the mass changes?
8. Now try different angles.  What happens to the time for the bee to slide all the way down as the angle increases?  What do you think the acceleration is when the angle is set to 90º?
9. Take some readings from the physlet to determine the acceleration for three different angles (say 15º, 30º and 90º).  Do your results agree with the expected result that the acceleration should be gsinθ?
10. Type the answers to questions in an e-mail with the subject line reading "Asst 3 Phys12” and send it to [email protected]. If the system is slow you can write the answers on a sheet of paper to hand in. One assignment per person.

If you are done early you can go here and play with one of the kinematics physlets. Describe it briefly and what you have learned from it for bonus marks.