Download Physics 2nd Six Week Review

Physics 1st Six Week Review 2011-2012
1. Definitions:
speed, velocity,average velocity, instantaneous velocity, distance, displacement, acceleration, frame of
reference, scalar, vector, resultant, projectile, scalar, vector
2. What does slope represent on a displacement vs time graph?
What does slope represent on a velocity vs time graph?
3. Draw displacement and velocity graphs showing constant motion, no motion, and acceleration.
4. Identify the following as scalar or vector quantities:
36° C____
15 cm____
5mph south_____
+15m/s2_____
61 km/hr
5. What 3 controls in an automobile can change acceleration?
6. What is the difference between average velocity, velocity, and instantaneous velocity?
7. A bowling ball and a ping pong ball are dropped from the same height while standing on the moon.
Which one lands first? (the moon has no atmosphere, it is a vacuum)
8. Describe the relative velocity and acceleration of a ball as it is thrown into the air and drops to the
ground.
9. When do you use 9.8 m/s2 for a?
Displacement-Time Graph
500
displacement (meters)
400
B
C
300
200
D
100
0
-100
Series1
A
-200
-300
-400
-500
0
10
20
30
40
50
60
70
80
90
100
time (seconds)
10. Refer to graph above describing a car in motion and answer the following:
a. What is the velocity of a car during the first 20seconds? (include units)
b. What is the slope of segment CD? (include units)
c. What is the motion of the car during time 20s to time 60s?
d. Which segment represents the greatest velocity?
11. Refer to graph on the left describing a car in motion and
answer the following:
a. What does a line with a positive slope indicate on this
graph?
b. What would a line with a negative slope indicate on
this graph?
c. What is the slope of the line shown (include units)
Velocity vs. Tim e
6
Velocity (m/s)
4
2
0
-2
-4
-6
0
5
Tim e (s)
10
12. You start from home and walk 7 blocks east. You turn around
and walk 3 blocks back towards your house. What is your
distance? What is your displacement in respect to your house?
Can distance and displacement ever be the same magnitude?
13. A snail crawls 1.47cm in 95 seconds. What speed did the snail
crawl?
14. A truck enters the freeway at a velocity of 5.5 m/s and increases its velocity to 14.6 m/s in a time span
of 35 seconds. Calculate the acceleration of the truck.
15. A runner starts from rest and accelerates at a constant rate of .58 m/s2 for a distance of 25 meters. What
was the runners’ final velocity?
16. A truck enters the freeway at a velocity of 5.5 m/s and accelerates at a constant rate of .78 m/s2 for a
period of 18 seconds. What was the trucks final velocity?
17. A motorcycle is traveling at 9.6 m/s and accelerates uniformly to 15.8 m/s during a 10 second interval.
What is the total distance traveled by the motorcycle?
18. A stone is dropped from a bridge. How far does the stone fall after 5 seconds?
19. You stand at the top of a cliff 88.5 meters above the ground. You drop a ball straight
downward. How many seconds does it take for the ball to hit the ground?
Laws of Motion and Forces:
1. Gravity causes objects to accelerate at __________m/s2 toward the ground.
2. Newton’s 2nd Law says that force and acceleration are
A.
directly related.
B.
inversely related.
C.
not related.
3. Newton’s 1st law says that an object in motion will continue to move at a ____________________ velocity
until acted upon by an outside force.
4. A car hits a bug with a force of 50 N. With what force does the bug hit the car? ______________.
5. If all of the forces on an object are balanced, then the net force on the object is __________ N.
6. If all of the forces on an object are balanced, then the object is in motion/not moving. What law of motion
describes this model?
7. The launch of a rocket is an example of which law of motion?
8. How can two football players of different mass hit with the same force? Explain.
9. True or False: The more mass an object has the more inertia it exhibits.
10. What force always opposes motion?
11. If a person has a force of 300N, what is their mass?
12. If a person has a mass of 75kg, what is their weight?
13. A crate has a weight of 56 N. What is the mass of the crate?
14. To accelerate at 300 m/s2 what size force has to be applied to a 60 kg rock?
15. An object is acted on with 45N of force to the left and 30N of force to the right. Draw a free body diagram
and give the net force on the object.
16. What is less, your weight on the Earth or your weight on the moon?
17. What is less, your mass on the Earth or your mass on the moon?
18. If you are pulling a wagon and you increase your force by a magnitude of four, what happens to your
acceleration? To your mass?