13 Which form of energy does the flowing water possess? . gravitational energypotential energyelectrical energykinetic energy
14 A coolie carries a load of 500 N to a distance of 100 m A coolie carries a load of 500 N to a distance of 100 m. The work done by him is _________.5 N50,000 Nm1/5 N
15 The type of energy possessed by a simple pendulum, when it is at the mean position is 1. kinetic energy2. potential energy3. potential energy + kinetic energy4. 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? Potential energy cannot be transferred.radiantElectricalChemicalnone of the above
18 Electrical energy can be converted to: chemical energy.mechanical energy.radiant energy.any of the above.
20 EquationWorkDistanceforcew= F x dD = w/fF = 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 A construction worker holds a heavy tool box. How much work is done by the worker?FGdmgh½ mv2zero
27 An example of Kinetic Energy would be: a moving cara stretched rubber band that was just releaseda charge particle in an electric fieldall of the above
33 An example of a system having both kinetic and potential energy would be: a book resting on a tablea piece of sugaran object in free falla stretched rubber band
34 Which of the following statements is not correct energy is the capacity to do workWork can be express as Force x Distancepower is the amount of work done in a unit of timethe 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 J6000 J2000 J11000 J
36 A child pulls a balloon for 12 m with a force of 1 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 J6.0 J–6.0 J12 J
37 Which of the following energy forms is associated with an object due to its position? potential energytotal energypositional energykinetic energy
38 How much work would this 10 N force acting over 10 m do on a 10 kg object? a) 0 Jb) Jc) Jd) 980 Je)1000 J
39 A 10 kg mass is held 1. 0 m above a table for 25 s A 10 kg mass is held 1.0 m above a table for 25 s. How much work is done during that10 J250 J9.8 J980 Jnone
40 A rock weighing 10 newtons is lifted a distance d from the ground 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 _________.0.01 m0.1 m1 m10 m100m
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 5.00N215J
42 Potential or Kinetic? K P k Running in a marathon. Car in the parking lotAir across the classroomPencil over the deskEat candyKPk
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 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 = distanceD = w ÷ f or D = w/fD = 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 = 200JPushing
51 w = f x d w = f x d = 115N x 15m = 200N x 10m = 1725J = 2000J lifting 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 = 2000Jlifting
52 15. Write the units of force, distance, work W= Joules (J)F = Newton (N)D= meter (m)