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Unit 6, Quiz #1

 

Multiple Choice: Answer the first 30 questions on the ScanTron form.

 

1. TRUE or FALSE: An object can move in a circle at a constant speed and still have a changing velocity.

a. True

b. False

An object is moving in a circle at a constant speed in a 'clockwise fashion.' A 'God's eye' view of the circle and the object's location is shown. Use this diagram to answer the next three questions.

2. The vector arrow which best represents the direction of the velocity at the indicated location (1:30 position) is ____.

 

3. The vector arrow which best represents the direction of the acceleration at the indicated location (1:30 position) is ____.

 

4. The vector arrow which best represents the direction of the net force at the indicated location (1:30 position) is ____.

 

5. If any object is accelerating, then the object MUST be ____. Bubble in all that apply.

a. changing its direction b. changing its velocity

b. changing its velocity

c. speeding up d. changing its speed

changing its speed

e. maintaining a constant velocity

 

6. An object with mass 'm' is moving in a circle of radius 'R' at a constant speed of 'v.' The acceleration of the object will INCREASE if ____. Bubble in all that apply.

a. its mass were increased (while 'R' and "v" are held constant)

b. its speed were increased (while 'R' and "m" are held constant)

c. its radius were increased (while 'v' and "m" are held constant)

d. its mass were decreased (while 'R' and "v" are held constant)

e. its speed were decreased (while 'R' and "m" are held constant)

 

7. An eraser is tied to a string and whirled in a horizontal circle at a constant speed. Inertia is the natural tendency of the eraser to resist changes in its state of motion. This means that the eraser ___.

a. is not accelerating since it is maintaining the same circular path at a constant speedb. would natually move tangent to the circle if the string is released

b. would naturally move tangent to the circle if the string is released.

c. will continue along its circular path if the forces on it suddenly become balanced

d. would require an unbalanced force in order to leave the circle and continue tangent to it

e. is experiencing a balance of forces - the inward and the outward force balance each other

8. A car makes a left-hand turn. The front-seat passenger claims that she feels a sensation of being pulled outwards. This is best explained by the fact that ____.

a. while there may be a net inward force, there is still an outward force upon the passenger

b. the passenger has a natural tendency to move tangent to and out of the circular path

c. there is a centripetal force pushing the person 'out the door'

d. there is a centrifugal force which pushes the person 'out the door'

e. the passenger ate her Big Mac way too fast and is now paying for it

9. An eraser is tied to a string and held by a physics teacher. The eraser is whirled in a circle at constant speed. A 'God's eye' view of the circle is shown in the diagrams below. If the teacher lets go of the string when the eraser is at the indicated position, then which one of the paths best represents the motion of the eraser?

 

 

10. Suppose you go with your friend on a roller coaster ride. After the ride, your friend describes the 'awesome outward pull on the second loop.' Such a statement only proves that your friend ____.

a. is a coaster fanatic

b. truly experienced a centrifugal force

c. has consumed way too much cotton candy

d. knows that riders moving through circles experience outward forces

e. might not understand the physics of circular motion

 

11. A car is making a turn on a level roadway. The type of force which causes the car to make the turn is the ____.

a. force of gravity

b. normal force

c. air resistance force

d. force of friction

e. tension force

ab. applied force

ac. centrifugal force

ad. inertial force

12. Suppose that you are on a roller coaster ride and are moving through a somewhat circular loop. You are at the bottom of the loop and have just begun the upward ascent through the loop (as pictured). One can conclude that the normal force acting upon your body is _____.

a. directed upward

b. directed downward

13. One can also conclude that the normal acting upon your body is _____.

a. non-existent

b. of greater magnitude than the force of gravity

c. of lesser magnitude than the force of gravity

d. of equal magnitude to the force of gravity

e. ... impossible to tell the relative magnitude since the acceleration value is not explicitly stated

14. The force of gravitational attraction between the Sun and a planet is dependent upon ____. Bubble in all that apply.

a. the mass of the Sun

b. the mass of the planet

c. the radius of the planet

d. the radius of the Sun

e. the distance between the planet's center and the Sun's center

15. Isaac Newton is credited with the law of universal gravitation. One of the major elements of Newton's discovery (that had not yet been recognized) was the recognition that the force which causes the apple to fall to the Earth is ______.

a. gravity

b. the same force that causes rain to fall to the Earth

c. the same force that causes any object on Earth to fall to the Earth

d. the same force that causes any two objects in the universe to attract each other

e. none of these

16. Suppose that you are on a roller coaster ride and are safely moving through a somewhat circular loop. You are at the top of the loop and riding along the inside of the loop (as pictured). One can conclude that the normal force acting upon your body is _____.

a. directed upward

b. directed downward

17. One can also conclude that the normal acting upon your body is _____.

a. non-existent

b. of greater magnitude than the force of gravity

c. of lesser magnitude than the force of gravity

d. of equal magnitude to the force of gravity

e. ... impossible to tell the relative magnitude since the acceleration value is not explicitly stated

  

18. Suppose that an object weighs 20 Newtons on the surface of the earth (a distance of R from its center). If the same object is located a distance of 2R above the Earth's surface (a distance of 3R from its center), then the force of gravity upon it would be ____ Newtons.

a. 2.22

b. 5.00

c. 6.67

d. 10.0

e. 20.0

ab. 40.0

ac. 60.0

ad. 80.0

ae. 180

bc. None of these are even close.

19. The acceleration of gravity ('g') refers to the ____. Bubble in all that apply.

a. rate of acceleration of an object which is acted upon solely by gravity

b. force of gravity acting upon an object

c. gravity

d. weight of an object

e. acceleration of any object when acted upon by some net force

20. The acceleration of gravity (g) value for an object of mass 'm' located on the surface of some planet of mass 'M' and radius 'R' is ____ related to the ____. Bubble in all that apply.

a. directly, mass of the object (m)

b. inversely, mass of the object (m)

c. directly, mass of the planet (M)

d. inversely, mass of the planet (M)

e. directly, radius of the planet (R)

21. An astronaut is on the orbiting Space Shuttle, approximately 60 miles (~100 000 meters) above the surface of the Earth. (The Earth's radius is ~6 360 000 meters and its mass is ~5.98 x 10^24 kg.) At this location, one might predict the acceleration of gravity to be ____.

a. significantly greater than 9.8 m/s/s

b. significantly less than 9.8 m/s/s

c. a small percent more (1-10%) than 9.8 m/s/s

d. a small percent less (1-10%) than 9.8 m/s/s

e. 0 m/s/s, since the astronauts are 'in space'

 

22. Two objects are located at different locations about two planets with distinctly different masses. Compared to location A, the acceleration of gravity value at location B is ____ magnitude.

a. one-eighth the

b. one-fourth the

c. one-half the

d. the same

e. two times the

ab. four times the

ac. eight times the

ad. None of these

 

23. The orbital speed of an Earth-orbiting satellite depends on the ____. Bubble in all that apply.

a. mass of the satellite

b. mass of the Earth

c. distance from the satellite to the center of the Earth

d. radius of the Earth

e. ... nonsense! None of these variables effect the orbital speed.

 

24. A satellite is orbiting the Earth. If the orbital radius (the distance from the satellite to Earth's center) were somehow increased by a factor of 2, then the orbital speed of the satellite would ____ by a factor of ____.

a. increase, 2

b. increase, 4

c. increase, square root of 2

d. decrease, 2

e. decrease, 4

ab. decrease, square root of 2

ac. ... nonsense! An alteration in the orbital radius would not effect the orbital speed.

 

The elliptical path of an orbiting satellite is shown below. Several locations along the path are labeled with letters. Use this diagram for the next two questions.

25. Determine the location of lowest speed.

26. Determine the location with the greatest net force.

 

27. A satellite is orbiting the Earth at a constant speed and a constant altitude above the Earth. The best words which could be used to describe the motion of the Earth-orbiting satellite is to say that the satellite is _____. Bubble in all that apply.

a. at equilibrium

b. moving at a terminal velocity

c. not accelerating

d. free of gravitational influences

e. in a state of free fall

 

28. The net force acting upon an Earth-orbiting satellite is dependent upon the ____. Bubble in all that apply.

a. distance from the satellite to the center of the Earth

b. radius of the Earth

c. mass of the satellite

d. mass of the Earth

e. ... nonsense! None of these variables effect the net force.

 

29. TRUE or FALSE: A person who feels weightless is NOT being acted upon by the force of gravity.

a. True

b. False

 

30. Consider the several stages of Otis's elevator experiments. In which stage(s) would Otis feel less than his normal weight? Bubble in all that apply.

 

 

 

Problem-Solving:

Show all your work in an organized fashion on the following problems.

 

v = (2pi*R)/T

a = (V2/R)*F = (m2/R)

Fgrav = (Gm1m2)/d2

G = 6.67 x 10-11 N m2/kg2

Fgrav = m g

g = (GMcemtral)/ d2

  

 

31. Frieda Inhibitions, who has a weight of 550 N, drools as a Ferrari cruises past her. The Ferrari weighs 15000 N. At closest approach, Frieda and the Ferrari are separated by only 4.0 m.

a. What is Frieda's mass? _________________________

b. What is the mass of the Ferrari? __________________

c. Calculate the force of gravitational attraction between Frieda and her Ferrari? PSYW

 

 

 w

 

 

 

32. A roller coaster car loaded with passengers, has a mass of 500 kg; the radius of curvature of the track at the bottom point of a dip is 12 m. The vehicle has a speed of 18 m/s at this point.

• In the space at the right, draw a free-body diagram for the car (label forces according to type).

• Calculate the acceleration and the net force acting upon the car. PSYW

 

 

 

 

 

• Calculate the force exerted on the vehicle by the track? PSYW

 

 

 

 

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Last updated on 12/9/04.