PHYSICS 1403 QUIZ 1
Chapters 1 and 2, January 25, 2006
Partial credit will be LIBERAL, provided that you show your work!
Use back if necessary!
Name: ______________________
1. (5 points) Multiply 2.99 m by 5.7  10-3 , taking into account significant figures.
2. (5 points) CONCEPTUAL QUESTION: If the velocity of an object is zero, does it
necessarily mean that the acceleration is zero? Give a brief example to justify your answer.
3.
(20 points) A car moves to the right in the positive x-axis direction with initial velocity v0 =
30 m/s. At time t = 0 it is at the origin & the brakes are applied, slowing it down at a
constant acceleration a. It stops a distance 100 m to the right of the origin.
a. Calculate the acceleration a with which the car slows down.
b. Calculate the time it takes the car to stop after the brakes are applied.
c. Calculate the distance the car has moved after the brakes have been applied for 4 s.
d. Calculate the car’s velocity after the brakes have been applied for 3 s.