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Energy. Work Motion Direction Motion must be in the same direction of the apply force.

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Presentation on theme: "Energy. Work Motion Direction Motion must be in the same direction of the apply force."— Presentation transcript:

1 Energy

2 Work Motion Direction Motion must be in the same direction of the apply force.

3 Units Force Distance work Newton (N) Meter (m) Joules (J)

4 Equation Work Distance force w= F x d D = w/f F = w/d

5 Potential energy Energy store or waiting for being use. Potential energy cannot be transferred.

6 Kinetic energy Motion, movement Kinetic energy can be transferred from one moving object to another.

7 Kinetic EnergyPotential Energy SoundGravitational (GPE) Mechanical (objects move) Mechanical (objects in position…ready) Radiant (electromagnetic spectrum) Nuclear (energy stored in nucleus) Thermal (heat)Chemical (stored in particles) Electrical

8 We have been taught that: Every (Electrical) Child (Chemical) Knows (Kinetic) Pork (Potential - Gravitational. lift. Or elastic. spring) Sausages (Sound) Have (Heat) No (Nuclear) Legs (Light)

9 Work done = Force x _______ distance acceleration velocity speed

10 Units Force Distance work Newton (N) Meter (m) Joules (J)

11 Equation Work Distance force w= F x d D = w/f F = w/d

12 1 joule = 1 _______ N m 2 Kg. m 2 /s 2 N m N 2 m 2

13 Which form of energy does the flowing water possess?. gravitational energy potential energy electrical energy kinetic energy

14 A coolie carries a load of 500 N to a distance of 100 m. The work done by him is _________. 5 N 50,000 Nm 0 1/5 N

15 The type of energy possessed by a simple pendulum, when it is at the mean position is 1. kinetic energy 2.potential energy 3.potential energy + kinetic energy 4.sound energy

16 According to the scientific definition of work, pushing on a rock accomplishes no work unless there movement. a net force. an opposing force. movement in the same direction as the direction of the force.

17 Which of the following is a form of energy that is a kind of potential energy? radiant Electrical Chemical none of the above Potential energy cannot be transferred.

18 Electrical energy can be converted to: chemical energy. mechanical energy. radiant energy. any of the above.

19 Units Force Distance work Newton (N) Meter (m) Joules (J)

20 Equation Work Distance force w= F x d D = w/f F = w/d

21 Most all energy comes to and leaves the earth in the form of nuclear energy. chemical energy. radiant energy. kinetic energy.

22 The law of conservation of energy is basically that _________. energy must not be used up faster than it is created or the supply will run out. energy should be saved because it is easily destroyed. energy is never created or destroyed. you are breaking a law if you needlessly destroy energy.

23 The most widely used source of energy today is: A)coal. B)petroleum. C)nuclear. D)water power.

24 Which quantity has the greatest influence on the amount of kinetic energy that a large truck has while moving down the highway? A)mass B)weight C)velocity D)size

25 Which of the following statements is / are CORRECT? Inter-conversion of kinetic energy and potential energy is only valid in the system of roller coaster and simple pendulum. A hydroelectric power plants use the inter- conversion of kinetic energy and potential energy to generate electricity. We can make use of conservation of energy to create energy.

26 A construction worker holds a heavy tool box. How much work is done by the worker? FGd mgh ½ mv2 zero

27 An example of Kinetic Energy would be: a moving car a stretched rubber band that was just released a charge particle in an electric field all of the above

28 Units Force Distance work Newton (N) Meter (m) Joules (J)

29 Equation Work Distance force w= F x d D = w/f F = w/d

30 An example of Potential Energy would be: a moving car a battery a book resting on a table both b and c

31 Which is not an example of Solar Radiation Microwaves Magnetism gamma rays visible light

32

33 An example of a system having both kinetic and potential energy would be: a book resting on a table a piece of sugar an object in free fall a stretched rubber band

34 Which of the following statements is not correct energy is the capacity to do work Work can be express as Force x Distance power is the amount of work done in a unit of time the unit of power is the joule1.

35 A horizontal force of 200 N is applied to move a 55 kg television set across a 10 m level surface. What is the work done by the 200 N force on the television set? 550 J 6000 J 2000 J J

36 A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60 below horizontal. How much work does the child do on the balloon? –10 J 6.0 J –6.0 J 12 J

37 Which of the following energy forms is associated with an object due to its position? potential energy total energy positional energy kinetic energy

38 How much work would this 10 N force acting over 10 m do on a 10 kg object? a) 0 J b) 70.7 J c) 100 J d) 980 J e)1000 J

39 A 10 kg mass is held 1.0 m above a table for 25 s. How much work is done during that 10 J 250 J 9.8 J 980 J none

40 A rock weighing 10 newtons is lifted a distance d from the ground. The work done by the force that lifts the rock is 10 joules. The rock is then dropped on a wooden stake, thus driving the stake into the ground. The distance d is most nearly _________ m 0.1 m 1 m 10 m 100m

41 Solve using all procedure How much work is done on a bookshelf being pulled 5.00 m at an angle of 37.0 from the horizontal? The magnitude of the component of the force that does the work is 43.0 N. W= f x d = 43.0N x 5.00N 215J

42 Potential or Kinetic? Running in a marathon. Car in the parking lot Air across the classroom Pencil over the desk Eat candy K P K P k

43 How much work is done when a 5 N force moves a block 4 m? w = f x d = 5N x 4m = 20J

44 6. How much work is done when a 100 N force moves a block 59 m? w = f x d = 100N x 59m = 5,900J

45 7. Fred applies 350 N of force to move his stalled car 40 m, How much work did Fred do? w = f x d = 350N x 40m = 14,000J

46 8. You move a 25 N object 5 m. How much work did you do? w = f x d = 25N x 5m = 125J

47 9. You carry a 20 N bag of dog food up a 6 m flight of stairs. How much work did you do? w = f x d = 20N x 6m = 120J

48 11. How far will 350 J raise a block weighing 7 N? Far = distance D = w ÷ f or D = w/f D = w/f = 350J/7N = 59m

49 12. How far will 350 J raise a block weighing 15 N? D = w/f = 350J/15N = m = 23.33m round to the nearest hundredths

50 13. Which is more work, pushing with 115 N over 15 m or lifting 20 N 10 m? w = f x d w = f x d = 115N x 15m = 20N x 10m = 1725J = 200J Pushing

51 14. Which is more work, pushing with 115 N over 15 m or lifting 200 N 10 m? w = f x d w = f x d = 115N x 15m = 200N x 10m = 1725J = 2000J lifting

52 15. Write the units of force, distance, work W= Joules (J) F = Newton (N) D= meter (m)


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