Physics Final Review

16. If a car travels around a gentle curve on an interstate at 50km/h the velocity_____

changes

12. One can change the acceleration of a moving object by

changing direction of movement while maintaining a constant speed

18. A steady change in velocity can be described as

constant acceleration

67. If a net force acts at an angle to the direction an object is moving, the object will follow a (n) ___________ path

curved

63. In order to know how a force will affect an object, you must know the

direction

30. In a velocity-time graph the area under the line indicates

displacement

11. A length of a path between two points is a description of

distance

57. A (n) ____ is a push or a pull

force

61. A rubbing force that acts against motion between two touching surfaces is called

friction

87. An object following a straight line path at a constant speed has?

has zero acceleration

17. If an object in motion increases their speed the acceleration would

increase

72. The tendency of an object to resist change in its motion is called

inertia

44. The energy of motion is called

kinetic

A _____ force is the total force felt by an object

net

60. An object at rest will continue to be at rest until a net force acts on it describes

newton's first law

66. Whenever one object exerts a force on a second object, there is an equal and opposite force exerted on the first object. The preceding statement best describes

newton's third law

31. In a displacement-time graph the area under the line indicates

nothing

50. If the velocity of an object is decreased by half, its kinetic energy

reduces by three fourths

64. Weight is defined as

the product of the object's mass and acceleration due to gravity

61. Tangential velocity can be described as

v = 2πr / T

13. A rock is dropped from rest from the roof of a building 100m high. What is the velocity just before it hits the ground?

-44.3 m/s

35. Recoil can be described as

-Having the same equation as an elastic collision -The opposite of a collision -Having a net momentum of zero

19. A negative acceleration implies

-The final velocity is smaller than the initial velocity -The object is slowing down

77. Which of the following is true regarding torque?

-Torque occurs when a force is applied in a motion that is perpendicular to the distance -Creates a rotational motion -Is the perpendicular force applied times the lever arm

68. A force can change the motion of an object that is already moving by

-accelerating the moving object -changing its direction

41. Which of the following is true about impulse

-it is the product of the impact time and the impact force -equals the difference of momentum

43. You have an 8kg bowling ball in your shelf at a height of 1.5 meters. What is its momentum?

0

81. An 1876 N crate is being pushed across a level force at a constant speed by a force of 747 N at an angle of 57o above the horizontal. What is the coefficient of kinetic friction?

0 .178

89. A mass oscillates on a spring with an amplitude of 0.6m. What is its displacement when 60% of its energy is potential?

0.46m

39. A 1000-watt microwave oven takes 120 seconds to heat a bowl of soup. How many joules of energy does it use?

1.2 x 10^5 J

78. Venus rotates slowly about its axis, the period being 243 days. The mass of Venus is 4.87 x 1024 kg. Determine the radius for a synchronous satellite in orbit around Venus. (Assume circular orbit)

1.54*10^9

14. How long does it take a car from rest to cross 45 m of road after the light turns green if the acceleration of the car is a constant 25m/s2 ?

1.8s

84. The moon's gravity is 1/6 of the earth's gravity. The weight of a ball on earth would be ____it's weight on the moon.

1/6 times

82. Three blocks of masses 1.0, 2.0, and 4.0 kilograms are connected by massless strings, one of which passes over a frictionless pulley of negligible mass, as shown above. What is the tension of the string connected to the 1kg block?

11N

62. A 15kg box is being pulled across the table to the right at a constant speed with a force of 147 N. what is the force of friction?

147N

86. A projectile is fired horizontally from a height of 20 meters above the ground, with an initial velocity of 7.0 m/s. How far does the projectile travel horizontally before it reaches the ground

14m

9. What is the distance traveled of a deer that moves 5 miles north-west, then 6 miles east, then 4 miles south?

15 miles

10. A truck is moving up a steep hill at 30m/s when suddenly the engine stalls. The driver hits the breaks but they don't work!! The truck starts to accelerate at -3m/s2. How far does the truck move before it starts sliding back down the hill?

150m

34. You did 550 J of work lifting a 220 N backpack. How high did you lift the backpack?

2.5m

37. A motor does 2,000 joules of work in 90 seconds. What is the power of the motor?

22 W

47. A 0.5 kg baseball is dropped from rest and hits the ground at a speed of 10m/s. Calculate the gravitational potential energy of the baseball before it was dropped

25J

36. A 525 N gymnast jumps upward a distance of 0.50 m to reach the uneven parallel bars. How much work did she do before she even began her routine?

263 J

8. What is the displacement of a deer that travels 5 miles north-west, then 6 miles east, then 4 miles south?

3 miles east

27. A pitched ball is hit by a batter at a 35° angle and just clears the outfield fence, 100 m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. Ignore air resistance.

32 m/s at 35 degrees

52. If a bullet that weight 0.025kg and has a kinetic energy of 1,800 J immediately after being fired how fast is the bullet traveling?

379 m/s

38. Emily's vacuum cleaner has a power rating of 250 watts. If the vacuum cleaner does 3.6 x 106 joules of work, how long (in hours) did Emily spend vacuuming?

4 hrs.

29. A football is thrown 30 m due east, then the winds shift its trajectory at 55 degrees south of east for 20 m. calculate the football's resultant displacement.

44.6 m at 21.6 degrees south of east

23. An arrow is shot at 45.0° above the horizontal. Its velocity is 43 m/s, and it hits the target. What is the maximum height the arrow will attain?

47m

80. Masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string that passes over a frictionless pulley. Mass 1 is held at rest on the floor and m2 rests on a fixed incline of angle 40 degrees. The masses are released from rest, and m2 slides 1.00 m down the incline in 5 seconds. Determine the tension in the string

49.4N

53. A car takes 3.4 second to accelerate at a constant rate from rest to a speed of 27 m/s (60mph) if the mass of the vehicle is 1500kg, what is the car's kinetic energy?

5.5 x 10^5 J

71. As a 10,000 kg roller-coaster car starts down a slope its speed is 5m/s but 5 second later its speed is 30m/s. what is its force?

50,000 N

79. The maximum tension that a 0.80 m string can tolerate is 15 N. A 0.35-kg ball attached to this string is being whirled in a vertical circle. What is the maximum speed the ball can have at the top of the circle?

6.490

48. A 2 kg football is thrown at 25 meters per second. What is the kinetic energy of the football?

625 J

45. A 2.5 kg falls from a 30 meter high building, what is the potential energy of the brick?

735N

73. The acceleration due to gravity on earth equals

9.8 m/s^2

7. Which of the following describes a change in velocity?

A car traveling at a constant speed in a circular path

56. Which of the following is true

A force cannot exist without physical contact

2. A vector quantity refers to which of the following:

A quantity that has a magnitude, and a direction associated with it

1. A scalar quantity refers to which of the following:

A quantity that has a magnitude, but not a direction associated with it

46. An object in free fall experience what type of energy changes?

All of the initial potential energy converts to kinetic energy

55. Circular motion can be described as

An object rotating upon its axis

54. Which of the following conditions apply to newton's first law?

As long as the forces are balanced there is no acceleration

76. Which of the following is a fictitious force

Centrifugal force

51. What kind of energy is represented by an archer stretching a bow string?

Elastic potential

85. A 0.5kg cart released from rest at the top of a smooth inclined plane has gravitational potential energy of 6J relative to the base of the incline. When the cart has rolled halfway down the incline, the cart's potential energy will be:

Equal to 3J

70. Kinetic friction can be defined as

Friction that acts during motion

69. Static friction can be defined as

Friction that keeps an object at rest and prevents it from moving

42. How is impact force and impact time related?

Indirectly proportional

49. An object's gravitational energy depends on

Mass, acceleration and altitude

33. In an acceleration-time graph what does the slope represent?

Nothing

40. In an inelastic collision

Objects collide and become distorted in the process

15. In a distance-time graph the slope of the line represents

The average speed

5. Average speed is

The change of total distance in a given amount of time

4. Displacement can be described as

The difference of distance between the starting point and the final point

___ 25. How would a distance-time graph look like for an object that is accelerating?

The line would be curved

3. Acceleration is defined as

The rate at which velocity changes

26. How would a speed-time graph look like for an object that is moving at a constant speed?

The slope of the line would be zero

22 . If the acceleration is in the opposite direction as the velocity then

The speed decreases and the acceleration is negative

21. If the acceleration is in the same direction as the velocity then

The speed increases and the acceleration is positive

65. You hit a wall with a stick. The equal but opposite reaction is

The wall pushes against the stick

32. In an acceleration-time graph the area under the line indicates

Velocity

6. The major difference between speed and velocity is

Velocity includes direction

75. Which represents newton's second law

a = F / m

83. A satellite that is a spinning cylinder has initial rotational inertia I0 and angular velocity w0. Solar panels unfold from the satellite and are extended outward. The satellite then has rotational inertia If = aI0 and angular velocity wf = bw0, where a and b are constants. Which of the following is true about the constants a and b?

a > 1 and b < 1

24. In a velocity-time graph what does a positive slope represents

acceleration

59. In order to be ______ forces, their effects must cancel each other out and not cause a change in an object's motion

balanced