Physics
Páginas: 6 (1434 palabras)
Publicado: 16 de octubre de 2010
Work
1. It is the product of the force for the distance along which the force acts.
Work.
2. They are units used to measure work n the SI.
Nm.
3. The mathematical expression for work is:
(F) (s) (Cosθ).
4. When the applied force on an object and the displacement performed by it are in the same direction and sense, to the developed work can be considered as:
Positive.
5. Whenthe applied force on an object and the displacement performed by it are in the same direction but contrary sense, to the performed work can be considered as:
Negative.
6. Work is a physical quantity called:
Escalar.
7. From the following statement, the correct is:
Joule is a derived physical unit.
8. To perform work, the force that produces it has to be:
Any kind of force.
9. Inthe following figure is shown the same object (that weights 20N) in four images on which in each image acts a force F of 15 N. If the friction is neglected, the image is represented a less work is:
F
D)
10. Taking as reference the images of the previous figure, which of them represents the casewhere it is performed a major work?
F
45º
B)
11. From the following statements the correct is:
It is performed work if a person pushes a stroller for a baby and moves it certain distance over the ground.
12. An object that weight 10N is taken to a height of 3 m infour different Manners, the one from which is performed less work when raising it is:
Using a ramp (incline plane)
13. Three persons compete raising each one an object (that weights the same for everybody) to same height by an inclined plane; if A does it in 20 seconds, B in 26 seconds and C in 18 seconds, which persons performed a major amount of work?
Everybody performed the same work
14.From the following statements, the true is:
If an object freely falls to the ground, a work was performed on itself.
15. The work performed in a unit of time or the speed that a work is done is called:
Power
16. J/s is the unit of:
Watt
17-What is the unit of power in the SI?
Watt
18-The machine A raises a weight of 2,000 N to a height of 2 m in 30 seconds, the machine B do thesame as A, but in 20 seconds, According to the previous, we can say that:
B performs more work than A
19. It is the mathematical expression of power:
B performs more work than
20-Azalea (A) climbs a ladder in 15 seconds, Margarita (B) with equal mass than A, climbs the same ladder in 12 seconds, which of the following statements is correct?
B performs more work than A
21. The powerdeveloped by a person when dragging a block by the ground depends on:
a, b and c
Energy
22. It is the capacity of a body or system to perform work
Energy
23. An object can have:
Energy
24. The energy is measured with the same units as:
Work
25. The unit the measure energy in the SI is:
N . m
26. The unit of the previous question is called:
Watt
KINETIC ENERGY
27. It is theenergy in motion
Kinetic
28. It is the mathematical expression of the kinetic energy
½ mv2
29. The kinetic energy is a physical quantity called:
Scalar
30. The kinetic energy of a body is related to its:
Motion
31. A person would have major kinetic energy when it is:
Running by street
32. The objects A and B move to the same velocity; if A has the double of mass than B, thekinetic energy of A is:
2 times greater than B
33. If two bodies have the same kinetic energy, this would mean that:
The product ½ mv2, in both cases is the same
34. The objects A and B have the same mass; if the velocity of A is 2 times greater than B, the kinetic energy of A would be:
2 times greater than B
35. The objects A and B have the same mass; if the velocity of A is three...
1. It is the product of the force for the distance along which the force acts.
Work.
2. They are units used to measure work n the SI.
Nm.
3. The mathematical expression for work is:
(F) (s) (Cosθ).
4. When the applied force on an object and the displacement performed by it are in the same direction and sense, to the developed work can be considered as:
Positive.
5. Whenthe applied force on an object and the displacement performed by it are in the same direction but contrary sense, to the performed work can be considered as:
Negative.
6. Work is a physical quantity called:
Escalar.
7. From the following statement, the correct is:
Joule is a derived physical unit.
8. To perform work, the force that produces it has to be:
Any kind of force.
9. Inthe following figure is shown the same object (that weights 20N) in four images on which in each image acts a force F of 15 N. If the friction is neglected, the image is represented a less work is:
F
D)
10. Taking as reference the images of the previous figure, which of them represents the casewhere it is performed a major work?
F
45º
B)
11. From the following statements the correct is:
It is performed work if a person pushes a stroller for a baby and moves it certain distance over the ground.
12. An object that weight 10N is taken to a height of 3 m infour different Manners, the one from which is performed less work when raising it is:
Using a ramp (incline plane)
13. Three persons compete raising each one an object (that weights the same for everybody) to same height by an inclined plane; if A does it in 20 seconds, B in 26 seconds and C in 18 seconds, which persons performed a major amount of work?
Everybody performed the same work
14.From the following statements, the true is:
If an object freely falls to the ground, a work was performed on itself.
15. The work performed in a unit of time or the speed that a work is done is called:
Power
16. J/s is the unit of:
Watt
17-What is the unit of power in the SI?
Watt
18-The machine A raises a weight of 2,000 N to a height of 2 m in 30 seconds, the machine B do thesame as A, but in 20 seconds, According to the previous, we can say that:
B performs more work than A
19. It is the mathematical expression of power:
B performs more work than
20-Azalea (A) climbs a ladder in 15 seconds, Margarita (B) with equal mass than A, climbs the same ladder in 12 seconds, which of the following statements is correct?
B performs more work than A
21. The powerdeveloped by a person when dragging a block by the ground depends on:
a, b and c
Energy
22. It is the capacity of a body or system to perform work
Energy
23. An object can have:
Energy
24. The energy is measured with the same units as:
Work
25. The unit the measure energy in the SI is:
N . m
26. The unit of the previous question is called:
Watt
KINETIC ENERGY
27. It is theenergy in motion
Kinetic
28. It is the mathematical expression of the kinetic energy
½ mv2
29. The kinetic energy is a physical quantity called:
Scalar
30. The kinetic energy of a body is related to its:
Motion
31. A person would have major kinetic energy when it is:
Running by street
32. The objects A and B move to the same velocity; if A has the double of mass than B, thekinetic energy of A is:
2 times greater than B
33. If two bodies have the same kinetic energy, this would mean that:
The product ½ mv2, in both cases is the same
34. The objects A and B have the same mass; if the velocity of A is 2 times greater than B, the kinetic energy of A would be:
2 times greater than B
35. The objects A and B have the same mass; if the velocity of A is three...
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