<p>Number ______Name ______PHYSICS Honors Section 4-1 1. A car is traveling on an interstate highway in a positive direction could it have a positive velocity and a negative acceleration at the same time without changing direction? ______</p><p>2. You push a cart up the incline, after you release the cart, can the cart change the direction of its velocity when traveling with a constant acceleration?</p><p>. 3. Can the velocity of an object change when its acceleration is constant? If you answer yes, give an example. If you answer no, explain why not. ______4. What does the slope of the tangent to a velocity-time graph measure? ______5. If a velocity-time curve is a straight line parallel to the x-axis, what can be deduced about the acceleration? ______6. If you are given a table of velocities of an object at various times, how could you find out if the acceleration of the object is constant? ______7. Figure 4-4 shows the velocity-time graph for an accelerating car. The three "notches" in the curve occur where the driver shifts gears. a. Describe the changes in velocity and acceleration of the car while it is in first gear. ______b. Is the acceleration just before a gear change larger or smaller than the acceleration just after the gear change? Explain your answer. ______8. Study Figure 4-4. During what time interval is the acceleration the largest? ______, the smallest ______?</p><p>9. Solve the equation vf = vi + at for acceleration. What is the equation you get? ______10. Look at Figure 4-17, which is a position-time graph of uniform acceleration. a. What type of curve does this graph represent? ______b. What does the slope of a tangent line taken at any point represent? ______C. How would slopes taken at higher points on the line differ from those taken at lower points?</p>