Ana Lopez, Luis Pineda, Rosemary Salguero -Gravitational Motion, Rotational Motion, Work, Energy.

Question 1

1. What is the definition of work? -Remember

Answer 1

The transfer of energy that occurs when a force is applied through a distance; equal to the product of the system’s displacement and the force applied to the system in the direction of displacement.

Question 2

2. What is the definition of translational kinetic energy? -Remember

Answer 2

The energy of a system is due to the system’s change in position.

Question 3

3. What is rotational motion? -Remember

Answer 3

The motion of an object around a circular path, in a fixed orbit

Question 4

4. What is the definition of gravitational motion? -Remember

Answer 4

The force of attraction that bodies exert on one another as a result of their mass

Question 5

5. What is the definition of the law of conservation of energy? -Remember

Answer 5

States that in a closed, isolated system, energy is not created or destroyed, but rather, is conserved.

Question 6

6. Identify the effort force and the resistance force for the pedal and front gear. -Identify

Answer 6

The chain exerts an effort force on the rear gear, Fchain on gear. This force is equal to the force of the front gear on the chain. That is, F-gear on-chain = Fchain on gear.

Question 7

7. How to Identify the initial kinetic energy of the system. -Identify

Answer 7

kinetic energy (KE) is equal to half of an object’s mass (1/2*m) multiplied by the velocity squared

Question 8

8. Identify the law of conservation of energy to find KEf. -Identify

Answer 8

KEf= KEi+GPEi-GPEf

Question 9

9. Identify the conditions of an isolated system. -Identify

Answer 9

A physical system so far removed from other systems that it does not interact with them

Question 10

10. Identify the forces exerted by Earth’s math. -Identify

Answer 10

The gravitational force exerted by Earth’s mass on an object equals the object’s mass times the gravitational field, Fg = mg.

Question 11

11. Calculation question-A powerful motorcycle can accelerate from 0 to 30.0 m/s (about 108 km/h) in 4.20 s. What is the angular acceleration of its 0.320-m-radius wheels?

Answer 11

22.3rad/s^2

Question 12

12.calculation question-An astronaut is on a new planet. She discovers that if she drops a space rock from 10m above the ground, it has a final velocity of 3m/s just before it strikes the planet surface. What is the acceleration due to gravity on the planet?

Answer 12

-0.45 m/s^2

Question 13

13.calculation question-A 20kg box is dropped 13m. How much work was done on the box?

Answer 13

2548J

Question 14

14.Calculation question- Jerry pushes a 3.2kg box with 1.5N of force. What is the resultant acceleration?

Answer 14

0.47m/s^2

Question 15

15. calculation questions- A 1.12kg book falls off the top of a 2.03m bookshelf. How much work is required to put the book back on the top of the bookshelf, assuming it is lifted with a constant velocity?

Answer 15

22.28J

Question 16

16. understand- A woman pulls a crate up a rough inclined plane at constant speed. Which statement is false?

A. The work done on the object by gravity is zero
B. The gravitational PE of the crate is increasing
C. The work done by the net force acting on the crate is zero
D. The work done on the crate by the normal force is zero

Answer 16

A

Question 17

17. understand- The work done by a centripetal force on an object moving in a circle at constant speed is __________.

Answer 17

zero

Question 18

18. understand- Consider a constant force, given below, that acts on an object as it moves along the path r⃗ , also given below. Calculate the work W done on the object. The units of the force and path are N and m, respectively.

Answer 18

50J

Question 19

19. understand- You are pulling a dolly with special frictionless wheels on a level surface. There is a rope from your hand to the dolly which you are using to pull it with. The rope makes a 60∘ angle with the ground. You are applying 25Newtons of force.

How much work is done on the dolly over a distance of 5meters

Answer 19

62.J

Question 20

20. understand-Two objects of masses 2 kg and 4 kg are moving with the same momentum of 20 kg ms. (a) Will they have some kinetic energy! (b) Will they have same speed?

Answer 20

a. the kinetic energy of both masses is not the same.

b. As the momentum, p=mv, the two objects will not have same speed,

Question 21

21. definition: What is a revolution?

Answer 21

When an object circles an external axis

Question 22

22. Formula: What is the formula to take the Average angular velocity of an object?

Answer 22

It’s the angular displacement divided by the time required to make a rotation.

Question 23

23. Concept: What is earth’s angular velocity?

Answer 23

(2/pi rad) / (24h)(3600s/h) = 1.27 to the 10 negative 5th power (rad/s)

Question 24

24. Definition: What is gravitational force?

Answer 24

Force of attraction between two masses.

Question 25

25. Formula: What is the formula of the Law of Universal gravitation?

Answer 25

F= G(m1)(m2) / r squared

Question 26

26. Formula: What is the formula of Momentum?

Answer 26

p = Mass * Volume

Question 27

27. Definition: What is Momentum?

Answer 27

The strength gained through the development of events.

Question 28

28. Concept: What states Kepler’s first law?

Answer 28

The path of planets are ellipses.

Question 29

29. Concept: What states Kepler’s second law?

Answer 29

An imaginary line from the sun to a planet sweeps out equal areas in equal time intervals.

Question 30

30. Concept: What states Kepler’s third law?

Answer 30

The square of the ratio of the periods of any two planets revolving about the sun is equal to the cube ratio of their average distances from the Sun.