# First Semester Review

1. The Newton is a unit of

1. energy
2. force
3. mass
4. momentum
5. none of these

The Unit "Newton" (7 seconds)

2. A(n) ___________ quantity is completely described by its size and direction.

Scalars and Vectors (3 seconds)

For questions #3-4, consider the graph shown below:

3. Describe the motion of the object depicted in the above graph.

The Meaning of Shape for a p-t Graph (14 seconds)

4. Construct a velocity vs. time graph for the above motion.

The Meaning of Shape for a p-t Graph (14 seconds)

The Meaning of Shape for a v-t Graph (8 seconds)

Consider the graph on the right for questions #5-7:

5. Verbally describe the motion of the object depicted by the above graph .

The Meaning of Shape for a v-t Graph (8 seconds)

6. Determine the total displacement of the object during the 15 seconds.

Determining the Area on a v-t Graph (12 seconds)

7. Draw the acceleration vs. time graph that is derived from the graph above.

Use the ticker tapes for questions #8-10.

8. Which tape(s) show(s) acceleration?

1. A
2. B
3. C

Ticker Tape Diagrams (6 seconds)

Acceleration (12 seconds)

9. Which tape(s) show(s) negative acceleration?

1. A
2. B
3. C

Ticker Tape Diagrams (6 seconds)

Acceleration (12 seconds)

10. Which tape shows constant speed?

1. A
2. B
3. C

Ticker Tape Diagrams (6 seconds)

Speed and Velocity (8 seconds)

11. A ball thrown upward with a velocity of 25 m/s will go in the upward direction for about ______ seconds.

1. 25
2. 2.5
3. 5.0
4. 4.3
5. none of these

Kinematic Equations and Problem-Solving (7 seconds)

12. You (accidentally of course) drop your cat from the roof (of a very tall building). If it starts from rest and takes the cat 4.6 seconds to reach the ground (Hint: use the acceleration of gravity)...

... how fast is the poor cat going when it hits the ground (where very rapid deceleration occurs)?

Kinematic Equations and Problem-Solving (7 seconds)

... how tall is the building?

Kinematic Equations and Problem-Solving (7 seconds)

13. A 5.0-kg rock is thrown up vertically. Draw the free-body diagram on the rock during its trajectory.

What is a Projectile? (11 seconds)

For questions #14-16 consider a projectile thrown horizontally at 50 m/s from a height of 19.6 meters.

14. The projectile will take _____ time to hit the ground as it would if it were dropped from the same height

1. More
2. Less
3. The same

Characteristics of a Projectile's Trajectory (12 seconds)

15. The projectile will be in the air

1. 1.0 seconds
2. 2.0 seconds
3. 3.0 seconds
4. 4.0 seconds

Horizontally Launched Projectiles - Problem-Solving (10 seconds)

16. The projectile will cover a horizontal distance of ____ meters

1. 50
2. 100
3. 150
4. 200

Horizontally Launched Projectiles - Problem-Solving (10 seconds)

17. Given the net forces (F) upon the objects below and the resulting acceleration (a) of each which of the objects below has the greatest inertia?

Inertia and Mass (12 seconds)

Newton's Second Law (9 seconds)

18. If it is known that an unbalanced force is acting upon an object, then which of the following MUST be true regarding the object's motion? The object is:

1. at rest
2. being accelerated
3. losing mass
4. moving at a constant speed

Balanced and Unbalanced Forces (7 seconds)

The Big Misconception (9 seconds)

19. A 750 Newton person stands upon the floor. Considering action/reaction, what is the reaction force to the person's weight?

1. The floor pushing up on the person with 750 Newtons of force
2. The person pulling up on the earth with 750 Newtons of force
3. 0 N since the object wasn't accelerating
4. 1500 Newtons, since there is a total force of 1500 Newtons acting.

Identifying Action and Reaction Force Pairs (6 seconds)

20. A spiraled tube lies fixed in its horizontal position (i.e., it has been placed upon its side upon a table). When a marble is rolled through it it curves around the tube, draw the path of the marble after it exits the tube.

Newton's First Law (10 seconds)

Speed and Velocity (6 seconds)

Superman came from a planet (Krypton) which had an acceleration of gravity of 88 m/s/s. He weighs 833 Newtons on earth.

21. Superman's mass on Krypton would be ___ kg.

1. 9.8
2. 85
3. 833
4. 7480

Mass vs. Weight (8 seconds)

22. Superman's weight on Krypton would be ____ N.

1. 9.8
2. 85
3. 833
4. 7480

Mass vs. Weight (8 seconds)

23. A 75-kg object dropped over a large vertical distance. After 13 seconds of falling, the object experiences an upward force of air resistance of 550 Newtons. The acceleration of the object 13 seconds after being dropped is ____ m/s/s

1. 0
2. 2.5
3. 9.8
4. 735

Finding Acceleration (6 seconds)

For questions #24-26 use the following situation. A 60.0-gram golf ball was struck by one of GBS' golf team members. The impact lasted for 0.0015 seconds and the ball flew off the tee at 45 m/s.

24. The impulse experienced by the ball was ___ kg*m/s

1. 0
2. 2.7
3. 45
4. 1800

Momentum and Impulse Connection (14 seconds)

25. The net force exerted upon the ball was ____ Newtons.

1. 0
2. 2.7
3. 45
4. 1800

Momentum and Impulse Connection (14 seconds)

26. If the club head a mass of 540 grams, the net force exerted upon the golf club was ____ Newtons.

1. 0
2. 2.7
3. 45
4. 1800

The Law of Action-Reaction (Revisited) (8 seconds)

27. The coefficient of kinetic friction for wood on wood is 0.22. The applied force that would be necessary to pull a 35 kg wood block across a wooden floor at a constant speed is ___ Newtons.

1. 0
2. 0.22
3. 35
4. 75

Friction and Coefficient of Friction (8 seconds)

Finding Individual Forces (7 seconds)

28. The resultant of the two vectors is best represented by:

Resultants (6 seconds)

29. The best representation of the relationship between force and acceleration is:

1. Directly
2. Force and acceleration are directly related
3. Net force is directly related to acceleration
4. Acceleration is directly related to net force
5. All of the these are equivalent

Newton's Second Law (9 seconds)

30. In the movie "Crocodile Dundee" Dundee grabs a rope with his bare hands, drops a few stories, and stops relatively instantly and crashes through a window. Using momentum, what is wrong with this scene?

Momentum and Impulse Connection (14 seconds)

Real-World Applications (15 seconds)

31. Momentum is defined as:

1. Changing speed
2. Mass in motion
3. Accelerating
4. Force times time

Momentum (7 seconds)

Smackin D. Face is riding his bike at a high speed when he encounters a moth in a gruesome head-on collision. The unfortunate moth is about to meet Smackin's Goggles. For questions #32-34 below, consider the moth-Smackin collision.

32.Which object (Smackin or the moth) experiences the largest force?

1. Smackin
2. The Moth
3. They both experience the same

The Law of Action-Reaction (Revisited) (8 seconds)

Momentum Conservation Principle (16 seconds)

33. Which object (Smackin or the moth) experiences the greatest change in momentum?

1. Smackin
2. The Moth
3. They both experience the same

The Law of Action-Reaction (Revisited) (8 seconds)

Momentum Conservation Principle (16 seconds)

34. Which object (Smackin or the moth) experiences the largest change in velocity?

1. Smackin
2. The Moth
3. They both experience the same

The Law of Action-Reaction (Revisited) (8 seconds)

Momentum Conservation Principle (16 seconds)

35. Moving at 20.0 m/s, a car of mass 710 kg collides head on with a stationary truck of mass 1400 kg. If the two vehicles interlock as a result of the collision, then what is the velocity of the car-truck system after the collision?

1. 6.7 m/s
2. 20 m/s
3. 710 m/s

Collisions - Problem-Solving (12 seconds)

36. A 0.50-kg ball traveling at 6.0 m/s collides head on with a 1.00-kg ball at rest. The 0.50-kg ball moves away traveling opposite to its original direction at 2.0 m/s after the collision. Find the velocity of the 1.00-kg ball after the collision

1. 2.0 m/s
2. 4.0 m/s
3. 6.0 m/s
4. 8.0 m/s

Collisions - Problem-Solving (12 seconds)

37. If a person jumps twice as high on a trampoline, ...

1. she will have twice the potential energy at the top of her jump.
2. she will have started with twice the kinetic energy at the begining of her jump.
3. she will have four times as much potential energy at the top of her jump.

Potential Energy (12 seconds)

Kinetic Energy (4 seconds)

38. A person jumps on a trampoline. If the person reaches a height above the trampoline of 0.350 meters, with what velocity did the person leave the trampoline? (Hint: mass cancels from the work-energy equation)

1. 0.35 m/s
2. 0.85 m/s
3. 6.9 m/s
4. 2.6 m/s
5. none of these

Work-Energy Theorem - Problem-Solving (13 seconds)

39. A 50.0-kg sack is lifted 2.0 meters in the same time a 25.0-kg sack is lifted 4.0 meters. The power expended in raising the 50-kg sack as compared to the power used to lift the 25-kg sack is:

1. Twice as much
2. Half as much
3. The same

Power (13 seconds)

40. Since the earth is attracted to the sun, why doesn't it fall into the sun?

1. Because it has a large tangential velocity.
2. Because there is an equal force holding it away from the sun.
3. Because it has too much mass to move towards the sun.
4. Because it has too much inertia to move toward the sun.

The Apple, the Moon, and the Inverse Square Law (12 seconds)

Circular Motion Principles for Satellites (10 seconds)

41. A 1350 kg car traveling at 16 m/s rounds a curve of radius 212 meters.

...What is the size and direction of the centripetal acceleration?

Acceleration (10 seconds)

...What is the size and direction of the net force?

The Centripetal Force Requirement (14 seconds)

...What is the minimum force of friction between the tires and the road?

Newton's Second Law and Circular Motion (12 seconds)

42. In which case is the force greatest on the arms of the hanging person?

Equilibrium and Statics (23 seconds)

Question #4

Question #7

Question #13

NOTE: Even as the projectile is rising, the only force acting upon is the downward force of gravity. The projectile rises only because it still has an upward velocity. This upward velocity is continuously decreasing as gravity acts upon the object.

Question #20

NOTE: the marble leaves tangent to the circle in a straight-line, inertial path.