1. Final Exam Review

2. Accurate or Precise?

3. Practice
The boiling point of water is °C. In four trials, a lab group finds the boiling point to be 97° C, 92 °C, 105 °C, and 140 °C. The results are...
a. accurate but not precise.
b. precise but not accurate.
c. neither accurate nor precise.
d. both accurate and precise.

4. Practice
A company sold some defective meter sticks (missing the 70 cm mark) to the school. If all the physics students used these instruments to measure the height of the door to the nearest m, their results would be...
a. accurate but not precise.
b. precise but not accurate.
c. neither accurate nor precise.
d. accurate and precise.

5. Important Vocabulary Scalar Definition
Can a scalar be positive? Negative?
Examples
Vector
How to draw
Can a vector be positive? Negative?

6. What’s wrong with the vectors?

7. Important Vocabulary Distance Definition Can distance equal zero?
Displacement
Can displacement equal zero?

8. Practice Weight is a _____ quantity because it ______.
a. scalar; acts in no direction
b. vector; acts in no direction
c. scalar; acts in a certain direction
d. vector; acts in a certain direction

9. Practice
A vector is 24 m/s, 17° N of W. The magnitude of the vector is...
a b. 24 m/s c. 10° d. N of W
The direction of the vector above is...
a. 24 m/s b. northwest c. 17° d. 17° N of W

10. Practice
Two vectors have values of 6 N and 12 N. Determine the three possible resultants.

11. Practice
What are the components of a 100 N resultant vector that acts at a 35° angle to the horizontal?

12. Practice
A NASA team oversees a space shuttle launch at Cape Canaveral in Florida and then travels to Edwards Air Force Base in California to supervise the landing. Which group of people, the astronauts or the NASA team, has the greater displacement?

13. Practice
While John is traveling along a straight interstate highway, he notices that the mile marker reads 260. John travels until he reaches the 150 mile marker and then retraces his path to the 175 mile marker. What is John’s resultant displacement from 260 mile marker? What is the total distance traveled by John? Explain why they are different values.

14. Important Vocabulary Speed Definition Constant Velocity
Average velocity
Instantaneous velocity
Terminal velocity

15. Practice
A storm is moving toward your house at a speed of 20 km/hr. It is now 6200 m away from your house. In what time will the storm reach your house?

16. Important Concepts Analysis of graphs Position v Time Graph
Velocity v Time Graph
Slope of the graphs

17. Type of Relationship?

18. P-T graphs converted to V-T graphs

19. Analyze the motion

20. Analyze the motion

21. Analyze the Motion

22. Constant Acceleration on the x-axis
What is meant by constant acceleration?
Describe the motion in each frame.

23. Practice
What is the uniform acceleration that causes an object’s velocity to change from 32 m/s to 96 m/s in an 8.0 sec period?

24. Motion on the y-axis
In terms of velocity, acceleration, force, momentum and energy, describe an object in free fall.
What changes when the object is thrown upwards instead?

25. Practice
An astronaut drops a feather from 1.2 m above the surface of the moon. If the acceleration of gravity on the moon is 1.67 m/s2, how long does it take the feather to hit the surface?

26. Motion on the y-axis
Two objects, one of mass 5.0 kg and the other of mass 10.0 kg, are both dropped from the same height. Explain similarities and differences in how the objects fall.

27. 2-D Motion Define projectile, trajectory and range.
What are the two methods for launching a projectile?
How are these methods similar and how are they different?

28. Practice
A car slides off the road into a deep ravine. The horizontal velocity of the car was 10 m/s and it landed at the bottom of the ravine in 15 seconds.
Which type of projectile does this represent?
How deep was the ravine?
How far away from the edge of the road did the car land?
If the car had been traveling twice as fast, what variables would be different and which would remain the same?

29. Maximum and Minimum

30. Launch Angles What angle will result in maximum height?
What angle will result in maximum range?
What is the result of launching the same object at complementary angles?

31. Practice Neglecting air resistance, once a bullet leaves a gun, its...
a. horizontal motion is uniform.
b. vertical motion is accelerated.
c. neither a nor b
d. both a and b.

32. Mass or Weight?
Choose either mass or weight to match the statements below
A force
Amount of matter in an object
Never changes
A scalar
Always points downward
A vector
Based on location

33. Types of Forces Support force? Rope or cable?
Perpendicular to surface?
Opposes motion?
Always downward?
A challenge for racing sports?

34. Practice Stan has a mass of 72.5 kg. What is Stan’s weight?
If Stan goes to the moon, where g = 1.67 m/s2 what is his mass and weight?

35. Practice
What is the net force of the objects below?

36. Laws of Motion State the Laws of Motion.
Which Law is also known as the Law of Inertia? Why?
How are mass and inertia related?

37. Practice
If the mass of the object is 50 kg, what is the acceleration in each situation?

38. Friction What is the friction that exists between objects at rest?
What is the friction that exists between objects in motion?
Which of the two types of friction is stronger and why?

39. Friction
What may be determined from the coefficient of friction (µ)?

40. Practice Friction depends upon each of these factors except the...
a. nature of the substances in contact.
b. area of contact between the surfaces.
c. smoothness of the surfaces.
d. normal force exerted on object.

41. Practice
A 5 kg box on a horizontal table is pushed by a horizontal force of 15 N. If the coefficient of friction is 0.4, will the box move? Why or why not?

42. Momentum Define momentum.
What must occur in order to change the momentum of an object?
What is the relationship between impulse and momentum?

43. Practice
A 6.0 N force is applied to a 15 kg object for 3 seconds. What is the change in the momentum of the object?

44. Momentum Which has a greater momentum?
1.a cat in motion or a car at rest
2.a small car or a large car moving at the
same velocity
3. a 10 kg object moving at 6 m/s or a 1 kg
object moving at 60 m/s

45. Types of Collisions
How are elastic collisions, inelastic collisions and explosions similar? Different?
Which type:
Billiard balls in play?
A firecracker?
Football tackle?
Gas molecules?

46. Practice
A 300 kg train car moving at 15 m/s collides and sticks to a 250 kg train car that is initially at rest. What is the final velocity of the car system?
What type of collision does this represent? Why?

47. Work and Power
What are the two conditions that must be met in order for work to be done?
How is work related to energy?

48. Practice
Joe has a mass of 75 kg. He climbs a ladder and stops when he is 17.0 m above the ground. Did Joe do any work? If so, how much?
If Joe climbed the ladder in 15 seconds, what is his power?
Describe two ways that Joe could become more powerful.

49. Which type of energy? Based on location Energy of motion
Mass and height are components
Mass and velocity are components
A component of mechanical energy

50. Energy State the Law of Conservation of Energy.
Explain why GPE is path independent.

51. Label the Maximum Potential and Maximum Kinetic Energies
Explain why Point D must be lower than Point A.
Where is the total mechanical energy the greatest?

52. Practice
An falling object has a velocity of 17 m/s just before impacting the ground. From what height did the object fall? (Solve this problem using two different methods.)