1. Review the distinction between vector and scalar quantities. Make sure you know the difference between them.
2. Review the difference between distance and displacement, as well as speed and velocity.
3. So, we calculated average speeds and average velocities in class. Here is a question to think about. My average speed on the way to school was 24 miles per hour. Imagine that instead of driving safely and obeying the law, I drove at a CONSTANT speed of 24 miles per hour for the entire trip from home to school. Would I arrive at the same time or not? Discuss.
4. What do you suppose "instantaneous speed" or instantaneous velocity is? How could we determine it experimentally for a car or person?
5. Imagine a car driving straight at a constant speed of 25 m/s for 5 minutes. Draw an approximate graph that represents the displacement vs. time for the entire trip.
6. Two ropes are attached to a boulder that is stuck in the mud. One person pulls on the boulder with a force of 100-N south. Another person pulls on the boulder with a force of 250-N east.
a. Draw this as a problem.
b. Solve for the total force acting on the boulder - magnitude (number) and angle. You may need SOH-CAH-TOA to find the angle.
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