HOMEWORK ANSWERS
Devil[pic]Physics
Baddest Class on Campus
CHAPTER 2 TEST REVIEW
SOLUTIONS
OVERALL OBJECTIVE: SC.912.P.12.2. Analyze the motion of an object in terms of its position, velocity, and acceleration (with respect to a frame of reference ) as functions of time.
OBJECTIVE: Calculate average velocity when given a change in displacement and a change in time.
2. ( 3 / ___) Yesterday while driving down 5th avenue, I was able to get from 34th street to 49th street in 2 minutes and 6 seconds. If each block is a 1/10th of a mile, what was my average velocity in mph?
ANSWER:
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OBJECTIVE: Calculate change in displacement when given change in time and average velocity
3. ( 3 / ___) How far would I go if I drove for 37 min when moving at 15.75 m/s?
ANSWER:
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OBJECTIVE: Calculate change in time when given change in displacement and average velocity
4. ( 3 / ___) How long would it take to travel 102 cm when moving at 9.6 cm/min?
ANSWER:
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OBJECTIVE: Calculate acceleration when given change in velocity and change in time
5. ( 3 / ___) During my run down 5th avenue, I got stuck behind a Bio teacher doing 15 mph (24 km/hr – I was so bored driving so slow, I did the conversion). Once I got around her, I was able to accelerate to 70 km/hr in just 3.5 seconds. What was the acceleration of my rocket Nissan Frontier in m/s2?
ANSWER:
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OBJECTIVE: Calculate change in velocity when given acceleration and change in time
6. ( 3 / ___) When I mash down on the brakes of my rocket Nissan Frontier, I can decelerate at 8.6 m/s2. If I do that for 2 seconds while travelling at 25 m/s, what will my new speed be?
ANSWER:
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OBJECTIVE: Calculate change in time when given acceleration and change in velocity
7. ( 2 / ___) The stoplights on 5th avenue are timed so that if you drive an average 21.378 m/s you can hit every one green. How long will it take me to accelerate to that speed in my rocket Nissan Frontier if my acceleration is limited to 5.82 m/s2 because I have the A/C on?
ANSWER:
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8. ( 0 / ___) True or False (circle one) I spend way to much time driving down 5th avenue.
OBJECTIVE: Use the kinematic equations solve problems involving horizontal, uniformly accelerated motion.
9. ( 3 / ___) A plane must reach a speed of 80 m/s in order to take off. At full power, the plane can maintain a constant rate of acceleration of 2.5 m/s2. The runway is 1km long. Should the pilot go for it?
ANSWER:
Find out the distance it takes to reach the speed and see if it is less than the runway available.
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10. ( 4 / ___) Jeff Gordon accelerates his #24 Dupont, Pepsi Chevrolet coming out of turn 2 and down the straightaway at Daytona. 5.2 seconds later he approaches turn 3 and his speed is 101.5m/s. If he exited turn 2 at 82.3m/s, how long is the straightaway?
ANSWER:
To answer this problem, you must first find the rate of acceleration, then calculate the distance.
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11. ( 2 / ___) After decelerating at -2.23 m/s2 for 3.2 seconds, I find myself travelling at 17 m/s. What was my speed before I started slowing down?
ANSWER:
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OBJECTIVE: Use the kinematic equations solve problems involving vertical, uniformly accelerated motion.
12. A ball is dropped from a 60m tower.
a. ( 2 / ___) How long will it take to hit the ground?
ANSWER:
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b. ( 2 / ___) What will be the ball’s velocity just before it hits the ground?
ANSWER:
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13. ( 2 / ___) A slingshot propels a ball straight up into the air at 16.3 m/s. How high will it go?
ANSWER:
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OBJECTIVE: Calculate velocity given a graph of displacement versus time.
14. ( 2 / ___) Given the following graph, calculate the velocity from point A to point B.
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ANSWER:
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Point A (5,17)
Point B (9,12)
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OBJECTIVE: Calculate acceleration given a graph of velocity versus time.
15. Given the following graph,
a. ( 2 / ___) Calculate the acceleration from point C to point D.
ANSWER:
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Point C (12,16)
Point D (22,0)
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b. ( 2 / ___) Calculate the displacement from point A to point B.
ANSWER:
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3-Point BONUS: A police car at rest is passed by a rocket Nissan Frontier travelling at a constant110 km/hr. The policeman takes off in hot pursuit and catches up to the very dashing and intelligent driver in 700 meters. If the police officer maintains a constant rate of acceleration,
a. (1 pt / ___) How long did it take to catch the witty and debonaire speeder?
b. (1 pt / ___) What rate of acceleration did the police car maintain in order to meet the popular and athletic driver?
c. (1 pt / ___) What was the speed of the police car when it overtook the handsome speeder who is often mistaken for a rock star?
TEMPLATE
1. Calculate acceleration given a graph of velocity versus time.
2. Calculate displacement given a graph of velocity versus time.
OBJECTIVE:
16. ( 1 / ___)
ANSWER:
EQUATION SHEET
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-----------------------
Physics I Honors/Pre-IB Physics
Name: __________________________________
Period: ________ Date: ___________________
# Marks: XX Raw Score: IB Curve:
C
B
A
D
C
B
A
................
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