Chapter 5 Pretest.

Slides:

Advertisements

Similar presentations

Review for Energy, Work, Power Test. Work is always done ? What is the definition of work? A force moves an object in the direction of the force.

Advertisements

CBA #1 Review Graphing Motion 1-D Kinematics Projectile Motion Circular Motion Gravity Graphing Motion 1-D Kinematics Projectile Motion Circular.

Work Done by a Constant Force

ConcepTest Clicker Questions

Reading Quiz A cannonball is dropped from a tower. As it falls,

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Work and Energy Chapter 5 Table of Contents Section 1 Work Section.

Work, Energy, And Power m Honors Physics Lecture Notes.

Work and Energy Quiz Show your work on a separate sheet of paper and staple your work to the back.

Energy Physics 11. Types of Energy  Name as many different types of energy as you can. Think of an example to go with each.

Conservation of Energy

Fall Final Review WKS: WORD PROBLEMS. Average Speed 1. A rock is dropped from the top of a tall cliff 9 meters above the ground. The ball falls freely.

Work, power and energy(2)

Chapter 5 Work and Energy

CBA #1 Review Graphing Motion 1-D Kinematics

Chapter 4 Work & Energy Dr. Ali.

WORK In order for work to be done, three things are necessary:

Introduction to Work Monday, September 14, 2015 Work Work tells us how much a force or combination of forces changes the energy of a system. Work is.

Chapter 5 – Work and Energy If an object is moved by a force and the force and displacement are in the same direction, then work equals the product of.

2/19/03Physics 103, Spring 2004, U. Wisconsin1 Physics 103: Lecture 9 Energy Conservation, Power Today’s lecture will cover Potential Energy Conservation.

Work, Power, Energy Work.

Kinetic Energy A moving object has energy because of its motion. This energy is called kinetic energy.

How much work does a 154 lb. student do when climbing a flight of stairs that are 6 meters in height and 30 meters in length? If the stairs are climbed.

Chapter 1 The Science of Physics. Which of the following is an area of physics that studies motion and its causes? a. thermodynamics b. optics c. quantum.

Energy m m Physics 2053 Lecture Notes Energy.

Work and Energy. Work a force that causes a displacement of an object does work on the object W = Fdnewtons times meters (N·m) or joules (J)

Mechanical Energy & It’s Conservation.

Energy and work Sections 12, 13, 14 and 15

Work has a specific definition in physics. Work is done anytime a force is applied through a distance.

Sect. 6-5: Conservative Forces. Conservative Force  The work done by that force depends only on initial & final conditions & not on path taken between.

Work and Energy.

Fall Semester Review: Physics Situation 1: Air resistance is ignored. A person is standing on a bridge that is 150 m above a river. a. If a stone with.

A 1000 kg sportscar accelerates from zero to 25 m/s in 7. 5 s

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.

Motion, Forces and Energy Lecture 7: Potential Energy & Conservation The name potential energy implies that the object in question has the capability of.

Work has a specific definition in physics

Unit 07 “Work, Power, Energy and Energy Conservation” The Conservation of Mechanical Energy Problem Solving.

Work and Energy Work Kinetic Energy Work – Energy Theorem

Chapter 1 The Science of Physics

Work-Energy Theorem Work : W net = F net d However, we know F net = ma So work gives an object some acceleration Acceleration means the velocity changes.

Work Kinetic Energy Work – Energy Theorem Gravitational Potential Energy Mechanical Energy Conservation of Energy Work Kinetic Energy Work – Energy Theorem.

ENERGY Objectives: After completing this module, you should be able to: Define kinetic energy and potential energy, along with the appropriate units.

Everyone grab a small whiteboard and a dry erase marker.

 Work  Energy  Kinetic Energy  Potential Energy  Mechanical Energy  Conservation of Mechanical Energy.

Chapter 5 Work and Energy. Mechanical Energy  Mechanical Energy is the energy that an object has due to its motion or its position.  Two kinds of mechanical.

“It is important that students bring a certain ragamuffin, barefoot irreverence to their studies; they are not here to worship what is known, but to question.

Unit 3 Work, Energy & Power Serway Chapters 7 & 8 Glencoe Chapter 10 & 11 1 Unit 3 Section 3 Conservation of Energy.

PHY 101: Lecture Work Done by a Constant Force

 Work  Kinetic Energy  Work/Kinetic Energy Theorem  Potential Energy  Power Work, Energy & Power.

Potential Energy and Kinetic Energy.  Potential Energy = -Work by conservative forces  Wnc = Delta KE + Delta PE  KE=.5 mv^2  PE= mg delta H.

Work & Energy Review.

Work, Energy and Power.

Potential Energy and Conservation of Energy

Work Done by a Constant Force

Newton’s laws of Motion

Work Done by a Constant Force

Chapter 5.3 Review.

Newton’s laws of Motion

Energy IN = Energy OUT Means ALL Energy

Kinetic Energy Energy associated with the object’s motion.

AP 1 Energy practice.

Work Who does the most work? Definition of work in physics:

Chapter 5 Table of Contents Section 1 Work Section 2 Energy

Forms of mechanical energy

Kinetic and Potential Energy

Energy IN = Energy OUT Means ALL Energy

Physical Science Chapter 13 Section 3

Practice for FA5.2.

Energy and Momentum.

Presentation transcript:

Chapter 5 Pretest

1. Which of the following energy forms is associated with an object’s interaction with the environment? A) potential energy, B) mechanical energy, C) nonmechanical energy, D) kinetic energy.

1. Which of the following energy forms is associated with an object’s interaction with the environment? A) potential energy, B) mechanical energy, C) nonmechanical energy, D) kinetic energy.

2. Work is done when: a. the displacement is not zero b 2. Work is done when: a. the displacement is not zero b. the displacement is zero c. the force is zero d. the force and displacement are perpendicular

2. Work is done when: a. the displacement is not zero b 2. Work is done when: a. the displacement is not zero b. the displacement is zero c. the force is zero d. the force and displacement are perpendicular

3. Which of the following energy forms is the sum of kinetic energy and all forms of potential energy? a. total energy b. sum energy c. nonmechanical energy d. mechanical energy

3. Which of the following energy forms is the sum of kinetic energy and all forms of potential energy? a. total energy b. sum energy c. nonmechanical energy d. mechanical energy

4. An 80.0 kg climber with a 20.0 kg pack climbs 8848 m to the top of Mount Everest. What is the climber’s potential energy? a. 6.94 x 106 J b. 4.16 x 106 J c. 2.47 x 106 J d. 1.00 x 106 J

4. An 80.0 kg climber with a 20.0 kg pack climbs 8848 m to the top of Mount Everest. What is the climber’s potential energy? a. 6.94 x 106 J b. 4.16 x 106 J c. 2.47 x 106 J d. 1.00 x 106 J

5. A bobsled zips down an ice track starting at 150 m vertical distance up the hill. Disregarding friction, what is the velocity of the bobsled at the bottom of the hill? a. 27 m/s b. 36 m/s c. 45 m/s d. 54 m/s

5. A bobsled zips down an ice track starting at 150 m vertical distance up the hill. Disregarding friction, what is the velocity of the bobsled at the bottom of the hill? a. 27 m/s b. 36 m/s c. 45 m/s d. 54 m/s

6. What is the average power supplied by a 60 6. What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s? a. 380 W b. 560 W c. 610 W d. 670 W

6. What is the average power supplied by a 60 6. What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s? a. 380 W b. 560 W c. 610 W d. 670 W

1. Demarco Murray (100 kg) accelerates from rest to 9. 0 m/s in 1. 5 s 1. Demarco Murray (100 kg) accelerates from rest to 9.0 m/s in 1.5 s. What is the average power output of Demarco in kW?

F = ma F = 100(9/1. 5) = 600 N d = ½ at2 d = ½ (9/1. 5)(1. 5)2 = 6 F = ma F = 100(9/1.5) = 600 N d = ½ at2 d = ½ (9/1.5)(1.5)2 = 6.75 m P = Fd/t P = 600(6.75)/1.5 P = 2700 W = 2.7 kW

OR P = Fv The force is still 600 N, v is the average velocity 9/2 = 4 OR P = Fv The force is still 600 N, v is the average velocity 9/2 = 4.5 m/s. P = 600 x 4.5 m/s P = 2700 W = 2.7 kW

2. Two men push a car with a horizontal force of 250 N each for a distance of 10.0 m. If a frictional force of 180 N acts in the opposite direction, what is the net work done on the car?

W = Fnet x d W = (250 + 250 – 180)10 W = 3200 J

3. A 10 kg monkey with a 1 kg banana climbs to the top of a 10 m palm tree. What is the monkey’s potential energy?

PE = mgh PE = 10(10)10 PE = 1000 J

4. A 25 kg skier starts from rest and moves down a 30° incline 4. A 25 kg skier starts from rest and moves down a 30° incline. At the bottom of the run he is a vertical distance of 110 m below his starting point. If there is no friction between his skis and the snow, what is his velocity at the bottom of the incline?

PE = KE mgh = ½ mv2 gh = ½ v2 10(110) = ½ v2 v = 46.9 m/s

5. A bowling ball starts from rest and rolls to a speed of 40 m/s down a slope 20.0° above the horizontal. Disregarding friction, what is the minimum distance it must travel to reach this speed?

PE = KE mgh = ½ mv2 gh = ½ v2 10h = ½ 402 h = 80 m (continued)

80 m is the vertical distance, which is the opposite 80 m is the vertical distance, which is the opposite. The distance it rolls is the hypotenuse. sin 20° = 80/h h = 234 m

6. How is work related to force and displacement?

Work = force x displacement W = F x d

7. A skier with a mass of 88 kg hits a ramp of snow at 16 m/s and becomes airborne. At the highest point of flight, the skier is 3.7 m above ground. What is the skier’s gravitational potential energy at this point?

PE = mgh PE = 88(10)3.7 PE = 3256 J