# Science

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1. When is work done?
when a force causes a change in motion of an object
2. What is work
is a force that is applied to an object mutiplied by the distance of movement of the object
3. If we apply a force on an object that does not move. Is there any work being done
no work has been done
4. Sitting and looking at a computer screen is this work
no
5. Tapping on the keyboard and making the keys move is this work
yes, because your fingers are moving and applying a force in the direction of motion (down)
6. What units are work and energy expressed in ?
joules
7. What is power?
Power is the quantity that measures the rate at which work is being done. How fast work is being done
8. One watt is the amount of power required to do 1 _______ in 1 _______
joule of work in 1 second of time
9. What is energy (4)
• the ability to do work
• a measure of how much work is done
• a word to describe the power and effort of a force
• measured in joules
10. What are the two main types of energy
Kinetic energy and Potential energy
11. What is potential energy ?
is stored energy
12. Coaster has PE when it is at the ____ of the hill. EVen if it isn't moving yet, it may if a force is applied and it begins to move
Top
13. What is gravitational potential energy (GPE)
is the energy of an object due to its position above the surface
14. What is kinetic energy?
is the energy due to an object's motion and is active energy
15. A rock as it falls off of a cliff. Potential energy or Kinetic energy
16. kinetic
17. What is the Law of Conservation of Energy
The Law of Conservation of Energy says energy cannot be created or destroyed, but it can be transformed from one form to another.
18. What is the law of conservation of energy similar to ?
law of conservation of mass/matter
19. What are the forms of energy
• Mechanical : motion- Potential and Kinetic, includes sound
• Heat: friction
• Electromagnetic: light and electricity
• Chemical: food
• Nuclear: fusion
20. This is described as work divided by the time it takes to perform that work .
power
21. This is also known as kgm/sec2. It is the unit used to measure force
newton
22. This is the energy of motion
kinectic
23. This is one of the major reasons that machines never can reach a 100% effiency rating
friction
24. This is the unit used to designate work done.
jouel
25. this is the advantage of a high-horsepower automobile over a lower-horsepower automobile
acceleration
26. This is the ability to do work
energy
27. James Watt compared his steam engine to these when he was trying to market the new engine
horses
28. To determind the potential energy of an object, you must know the acceleration due to gravity, mass, and the ____
height
29. To compute a kinetic energy, you need mass and _____.
velocity
30. These are devices for mutiplying force or changing
machines
31. this is determined by mutiplying the force times the distace in which an object is moved
work
32. mass is caculated in units of _______________ when determining potential energy
kilograms
33. This is equal to the intial velocity okus acceleration mutiplied by time
final velocity
34. In an energy tranfer, the same type of energy moves to a __________ object.
different
35. Type of potential energy of objects at a height
gravitational
36. Energy of appliances such as stereos and computers
electrical
37. In an energy transformation, the object remains the __ but the energy changes to a different type
same
38. Type of potential energy of springs and rubber bands
elastic
39. Form of energy produced by musical instuments
sound
40. Ability to do work
energy
41. Law of ______________ of Energy states that energy cannot be created nor destroyed in a chemical reaction. It can be changed from one form to another
Conservation
42. Type of energy that is stored
potential
43. unit of energy
joule
44. Energy of radiant objects such as fire
light
45. Form of potential energy in food and dynamite.
chemical
46. In a light bulb, electrical energy changes to light energy. This is an example of an energy _____________-.
transformation
47. Form of energy of nuclear reactions
nuclear
48. Thermal energy
heat
49. When cooking on a stove, the heat energy moves from the stove to the saucepan to the cooking food. This is an exmaple of an energy ________
50. transfer
 Author: Anonymous ID: 214838 Card Set: Science Updated: 2013-04-21 18:05:16 Tags: Science Folders: Description: Science Show Answers: