Physics Semester 2 Final Exam Review Answers - Grosse Pointe Public School System
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6Physics Semester 2 Final Exam Review Answers
1600 kg
800 kg
6 m/s
A truck with mass16000 kg collides with a car with mass 800 kg at rest. They stick together and continue to move to the right.
1.
What is the total momentum of the system before the collision?
9600 kgm/s
2.
What happens to the total momentum of the system after the collision?
momentum before = momentum after
that is the law!
3.
What is the velocity of the pair after the collision?
4 m/s
4.
Compare the force of the truck on the car to the car on the truck during the collision.
F car on truck = F truck on car
they are Newton’s 3
Law Force Pairs
rd
5.
Why is it safer for the driver of the car to impact the airbag than the windshield?
The air bag increases the stopping time thereby decreasing the stopping force
6.
Is it possible for a bowling ball and a golf ball to have the same momentum?
Yes – the bowling ball has to be slow and the golf ball fast to equal out the masses
A Civil War cannon with mass 800 kg fires a cannon ball with mass 8 kg.
7.
Which exerts more force, the cannon on the ball or the ball on the cannon?
F cannon on ball = F ball on cannon
they are Newton’s 3
Law Force Pairs
rd
8.
Based on mass which will have larger change in velocity the cannon or cannon ball? U7S7
The ball has a bigger change in velocity because it has a smaller mass
9.
If the cannon applies an average force of 10,000 N to the ball for 0.10 seconds, at what speed
does the ball leave the cannon?
125 m/s
Imagine that a steel ball is swung in a horizontal circle at a constant speed.
D
E
C
10. In what direction does the velocity of the ball point?
B
The velocity always points tangent to the circular path
11. In what direction does the acceleration of the ball point?
The acceleration always points toward the center
A
12. Are the forces balanced or unbalanced? How do you know?
The forces are unbalanced – you know this because the velocity is changing directions so
Top View
the ball is acceleration and acceleration means unbalanced forces
13. In what direction does the unbalanced force on the ball point??
The unbalanced force always points toward the center (same as the acceleration)
14. What is the nickname we give to the unbalanced force on the ball? What provides that unbalanced force?
unbalanced force = centripetal force and is provided (in this case) by the string
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