Energy Lecture Slide 1 Work & Energy. Energy Lecture Slide 2 Work Work = (Force in direction of motion)*distance W, Joule (J) = N-m 1 J is work done in.

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Presentation transcript:

Energy Lecture Slide 1 Work & Energy

Energy Lecture Slide 2 Work Work = (Force in direction of motion)*distance W, Joule (J) = N-m 1 J is work done in lifting 1 N (weight of average apple) at a constant speed, vertically 1 m

Energy Lecture Slide 3 Work Work = (Force in direction of motion)*distance W, Joule (J) = N-m 1 J is work done in lifting 1 N (weight of average apple) at a constant speed, vertically 1 m

No Work person holding sign is doing no work waiter carrying tray is doing no work Person pushing stationary car is doing no work Energy Lecture Slide 4

Work Question 1 A 10 N horizontal force is applied to push a block across a frictionless, horizontal surface through a distance of 5.0 m to the right. What is the work done on the block by each of the forces shown? Energy Lecture Slide 5

Work Question 2 A frictional force slows a moving block to a stop through a distance of 5.0 m to the right. What is the work done on the block by each of the forces shown? Energy Lecture Slide 6

Work Question 3 A 10 N horizontal force is applied to push a block across a frictional surface at constant speed through a displacement of 5.0 m to the right. What is the work done on the block by each of the forces shown? Energy Lecture Slide 7

Work Question 4 A 2 kg object slides at a constant speed across a horizontal, frictionless surface through a distance of 5.0 m to the right. What is the work done on the block by each of the forces shown? Energy Lecture Slide 8

Work Question 5 A 2 kg object is pulled upward at a constant speed by a 20 N force through a distance of 5 m. What is the work done on the block by each of the forces shown? Energy Lecture Slide 9

Energy Lecture Slide 10 Power Power = Work/time P, J/s = Watt 1 horsepower = 746 Watts

Power Question A 60 kg student climbs a 5 m high flight of stairs at a constant speed in 3 seconds. What is the student’s power rating? Energy Lecture Slide 11

Energy Lecture Slide 12 Gravitational Potential Energy Energy of position Gravitational Potential Energy PE = mgh PE is the work done against the field to move an object to a certain position Lifting apple 1 m – 1 J of PE PE is the work that the object can do –Stored energy

Potential Energy Question Use the fact that the PE of the ball at the top of the stairs is 50 J to determine the PE at the other locations. Energy Lecture Slide 13

Energy Lecture Slide 14 Elastic Potential Energy Energy stored by compressing or stretching a spring PE = 0.5 k x 2 K is the spring constant – a measure of the stiffness of the spring

Energy Lecture Slide 15 Kinetic Energy KE is energy of motion KE = 0.5 mv 2 Apple (0.10 kg) thrown at 5 m/s KE = (0.5)(0.10 kg)(5 m/s) 2 = 1.25 J

Kinetic Energy Question What is the kinetic energy of my 1000 kg car when it is traveling at 25 m/s? Energy Lecture Slide 16

Energy Lecture Slide 17 Work =  Energy Work produces a change in energy Work done by friction in stopping a car is equal to the change in kinetic energy experienced by the car F*d = -0.5mv 2 How does doubling a car’s speed, affect the stopping distance?

Energy Lecture Slide 18 Stopping Distance Given that F is a fixed value for given road/tire conditions, the stopping distance is proportional to the KE How does doubling the speed affect the KE?

Energy Lecture Slide 19 Stopping Distance Given that F is a fixed value for given road/tire conditions, the stopping distance is proportional to the KE How does doubling the speed affect the KE? (2v) 2 = 4v 2 4X the KE, thus, 4X the stopping distance

Energy Lecture Slide 20 Stopping Distance How does tripling the speed affect the stopping distance?

Energy Lecture Slide 21 Stopping Distance How does tripling the speed affect the stopping distance? (3v) 2 = 9v 2 9X KE means 9X the stopping distance

Pulleys and Force Energy Lecture Slide 22

Pulleys and Work Energy Lecture Slide 23

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