Download Midterm Review 2 - Hicksville Public Schools

Midterm Review 2
Scalar or Vector
Distance
Mass
Force
Time
Momentum
Speed
Displacement
Velocity
Acceleration
1D Motion & Free-fall
1. A racecar accelerates from 10 m/s at a rate of 8 m/s2 for 6.7 seconds. What distance does it cover?
246.6 m
Don’t forget how to get those hidden given variables.
2. A train traveling at 30 m/s comes to a stop over a distance of 1200 m. What is the magnitude of its
acceleration? What is its final velocity?
-0.375 m/s2
3. A snowball is dropped from the roof of a 12 m tall building. How fast is it moving when it hits the
ground? What is its initial velocity? What is its acceleration?
15.3 m/s
4. A ball is thrown upwards with an initial velocity of 17 m/s. What height does it reach?
What is its final velocity? What is its acceleration?
14.7 m
How does mass or weight effect free-fall?
5. Mr. Evans drops a 1 kg snowball onto a passing student and Mr. Vigneaux drops a 2 kg snowball
onto a failing student. Whose student will be pummeled with snow first?
Same time
Vectors
6. A 7 Newton force and a 6 Newton force act concurrently on a point. What will their minimum and
maximum resultants be? At what angles will those occur?
1 N, 180 degrees
13 N, 0 degrees
7.
a.
b.
c.
What happens to a resultant force as the angle between two forces goes from:
0-90 degrees? Decrease (further from zero)
90-180 degrees? Decrease (further from zero)
45-35 degrees? Increase (closer to zero)
8. Using a metric ruler, use the tip-to-tail
method to draw the resultant vector from adding
A and B.
9. Sketch the equilibrant – the vector that will
bring these vectors back to equilibrium for each
10. Sketch the resultant for each
Projectile Motion
How does horizontal velocity affect vertical motion?
11. A cannon fires a cannonball at 200 m/s off a 60 m cliff. A person drops a cannonball at the same
time. Which hits the ground first?
Same tim
Multi-part projectile motion problems will typically follow a logical order
12. A cannon fires a projectile with an initial velocity of 80 m/s at an angle of 35 degrees.
a. What is the initial vertical velocity of the projectile?
45.9 m/s
b. What height will the projectile reach?
107.4 m
13. A plane traveling at 150 m/s drops a care package. Twelve seconds later it hits the ground.
a. What is its initial velocity in the horizontal?
150 m/s
b. What horizontal range did the package travel?
1800 m
Graphing Motion
Remember DVA
Newton’s Laws & Forces
14. A 2000 kg car traveling at 30 m/s crashes into a pole. The pole stops the car with a force of 6 x 105
N for 0.10 seconds. What force does the car impart onto the pole?
6 x 105 N
15. A 40 N force pushes a 10 kg wagon with constant velocity. What is the force of friction acting on
the wagon?
40 N
16. A 50 N force pushes a 10 kg wagon which accelerates at 2 m/s2.
a. What is the net force on the wagon?
20 N
b. What is the force of friction slowing the wagon?
30 N
17. As shown in the diagram, 2 forces F1 and F2=200 N act on a 25 kg object. If the object accelerates
at a rate of 5 m/s2, and F2 is 200 N, what is F1?
75 N
18. A 90 kg man on an elevator is moving upwards at constant velocity. What upward normal force is
the floor providing to the man?
882 N
19. A 90 kg man is on an elevator accelerating upwards at 1.2 m/s2.
a. What is the net force acting on the man? 108 N
b. Is the normal force greater or less than the force of gravity? Greater
c. If he was accelerating downward, would the normal force be greater or less than his weight?
Less