A car starting from rest speeds up to 30 m/s with a constant acceleration over a time of 10 seconds. Then, it travels at 30 m/s for 10 seconds, and finally brakes to a stop in 20 seconds with a constant deceleration. Which of the following graphs represents its graph of speed versus time? C A B v v t v t t A B C D v D t

A car starting from rest speeds up to 30 m/s with a constant acceleration over a time of 10 seconds. Then, it travels at 30 m/s for 10 seconds, and finally brakes to a stop in 20 seconds with a constant deceleration. How far does it travel in the 40 second time period? 100 m 200 m 400 m 800 m None of the above.

Driving a car at in the positive x direction at 60 MPH, Mary tests her brakes by coming to a complete stop in 8 seconds. Then she resumes speed, taking 4 seconds to return to 60 MPH. A motion diagram is created by illuminating her car with a strobe at 2 second intervals. Which of the following best represents the correct diagram? Mary’s car is represented by a dot. Choice One Choice Two Choice Three Choice Four A B C D

Driving a car in the positive x direction at 60 MPH, Mary tests her brakes by coming to a complete stop at a constant rate of deceleration in 4 seconds. Then she resumes speed, taking 8 seconds to return to 60 MPH. Which of the following graphs best represents her velocity? Choice One Choice Two Choice Three Choice Four Five six v time v time v time v time v time v time

Driving a car in the positive x direction at 60 MPH, Mary tests her brakes by coming to a complete stop in 4 seconds. Then she resumes speed, taking 8 seconds to return to 60 MPH. Which of the following best represents her acceleration? Choice One Choice Two Choice Three Choice Four a time A B C D

Driving a car in the positive x direction at 60 MPH (equivalent to 88 ft/sec), Mary tests her brakes by coming to a complete stop in 4 seconds. Then she resumes speed, taking 8 seconds to return to 60 MPH. What is the value for her acceleration while stopping? 88 ft/sec2 44 ft/sec2 22 ft/sec2 -22 ft/sec2 -44 ft/sec2 -88 ft/sec2

These questions exhibited 4 out of the 5 representations of a situation. In physics, you should get used to using all of them. Verbal Pictorial Physical Graphical Mathematical

a time Which of the graphs of velocity versus time could correspond to the graph of acceleration versus time shown on the right? v time v time A B C v time A B C D E v time v time 2 of 250 D E 36

a time Which of the graphs of distance versus time corresponds to the graph of acceleration versus time shown on the right? s time A B C D E A B C D E 2 of 250 32

s time Which of the graphs of acceleration versus time corresponds to the graph of distance versus time shown on the right? a time A B C D E A B C D E 2 of 250 26

A ball is launched vertically upward from ground level with an initial velocity of 30 m/s. How much time does it take before it lands on the ground? Use |g|=10 m/s2. 30 m/s +y 1 s 2 s 3 s 4 s 6 s None of the above. 188 of 250 38

A ball is launched vertically upward from ground level with an initial velocity of 30 m/s. what maximum altitude does it reach above the ground? Use |g|=10 m/s2. 30 m/s +y 10 m 20 m 30 m 40 m 45 m None of the above. 186 of 250 35

Upward, constant magnitude Upward, increasing magnitude You throw a ball vertically upward. Which statement best describes the direction and magnitude of the ball’s acceleration while the ball is still moving up? Upward, constant magnitude Upward, increasing magnitude Upward, decreasing magnitude Downward, constant magnitude Downward, increasing magnitude Downward, decreasing magnitude Zero acceleration 2 of 250 40

Upward, constant magnitude Upward, increasing magnitude You throw a ball vertically upward. Which statement best describes the direction and magnitude of the ball’s velocity while the ball is still moving up? Upward, constant magnitude Upward, increasing magnitude Upward, decreasing magnitude Downward, constant magnitude Downward, increasing magnitude Downward, decreasing magnitude Zero velocity 2 of 250 40

You throw a ball vertically upward You throw a ball vertically upward. The ball moves up, reaches its highest point, and finally falls down. Which of the following graphs best represents the ball’s acceleration and velocity vs. time during the process? Time v a A B D C A B C D 2 of 250 39