Energy #1 1. What’s the PE of a 142.3 kg rock located at a height of 8.4m above the floor? 2. How much work did it take to raise the rock to that height?

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

WHAT IS FRICTION?. WHAT IS FRICTION? WHAT IS FRICTION? Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material.

Work Done by a Constant Force

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

Work, potential and kinetic energy

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

Chapter 5 – WORK and ENERGY. 5.2 MECHANICAL ENERGY.

ENERGY LCHS Dr.E.

Energy Chapter 5. What is energy? The property of an object that allows it to produce a change in itself or its environment. The property of an object.

Energy Chapter 5. Mechanical Energy Energy due to movement or position. Energy due to movement or position. Kinetic Energy – energy of motion Kinetic.

Fall Final Review WKS: WORD PROBLEMS Part II. 1. A car travels at a constant speed of 15 m/s for 10 seconds. How far did it go?

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.

DEFINITION OF KINETIC ENERGY Kinetic energy is the energy of motion

Work, power and energy(2)

Chapter 5 Work and Energy

Conservation of Energy. What Is Energy? Energy makes change possible. Science definition: Energy is the ability to do work Measured in Joules, J. Just.

Chapter 15 Energy. Windup Toy xwCUzYuiTdkhttp:// xwCUzYuiTdk.

Bellringer 10/25 A 95 kg clock initially at rest on a horizontal floor requires a 650 N horizontal force to set it in motion. After the clock is in motion,

Physics Chapter 11 Energy.

Kinetic and Potential Energy

Energy m m Physics 2053 Lecture Notes Energy.

Work IN, Work OUT The Work/Energy Principle. Kinetic Energy KE depends on mass and velocity Work done on an object will change KE.

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)

What do you think of when

Force (N) Compression (cm) By using Hooke’s Law and the graph shown, work out the spring’s Spring Constant.

Sub title Potential Energy Work Work- Energy Theorem Kinetic Energy Power 200 Work-Power-Energy.

Warm up 1) How much energy does a 45 kg rock have when it is at the top of a 70 m cliff? 2) How much energy does a 20 kg tricycle have when it is moving.

Work and Energy.

SP1.Students will analyze the forms and transformations of energy.

Conservation of Energy

Work and Energy. What is energy? Defined as “ability to do work” But, what is work? Work = Force * displacement When work is done, energy is transferred.

Warm up 1. A 500 kg car is traveling 18 m/s, how much kinetic energy does it have (in Joules)? 1. A 500 kg car is traveling 18 m/s, how much kinetic energy.

Work (Pay special attention to words in BLACK) What is “Work”? According to physics… Work is a force applied for a certain distance. W=F  x.

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

Energy and Work. Energy Energy is the ability to change or cause change. If something has no energy, there can be no change.

Review for Energy Exam. What is the work required for 60 kg astronaut to lift herself 0.2 m on Earth 0.2 m Ans. 120 J.

Work- Mechanical Energy - ‘To Do Work, Forces Must Cause Displacements’ frictionless.

Kinetic and Potential Energy UCR MESA. What is Energy? What does it mean if you have a lot of energy? For students it means you can run around, lift weights.

DO NOW: Work = _________________

Work, Power & Energy How do they relate? (Stone, Ebener, Watkins)

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

Physics Section 5.2 Define and apply forms of mechanical energy. Energy is the ability to do work. Kinetic energy is the energy of an object due its motion.

Potential and Kinetic Energy How is all energy divided? Potential Energy Kinetic Energy All Energy Gravitation Potential Energy Elastic Potential Energy.

ENERGY. KINETIC ENERGY ENERGY OF MOTION THE FASTER AN OBJECT MOVES; THE MORE KE IT WILL HAVE KE IS ALWAYS “+”, IF YOU ARE MOVING; THEN YOU HAVE IT. EXAMPLE:

Energy and its Conservation Physics Mrs. Coyle. Part I Mechanical Energy – Potential – Kinetic Work Energy Theorem.

Warm up – Do old way A boy pulls a large box with a mass of 50 kg up a frictionless incline (

The Physics Energy. Objectives Identify several forms of energy. Calculate kinetic energy for an object. Apply the work–kinetic energy theorem to solve.

Work is the product of a force moving an object a given distance.

Energy and its Conservation Physics. Part I Mechanical Energy – Potential – Kinetic Work Energy Theorem.

Energy and Work.

Work Done by a Constant Force

Energy and Work.

Let’s Play! Please listen carefully and think before answering.

Potential and Kinetic Energy

Kinetic and Potential Energy

Kinetic and Potential Energy

Energy and its Conservation

Work-Energy Theorem Energy is the ability to do work.

Work, potential and kinetic energy

Aim: How do we explain conservation of energy?

PE, KE Examples Answers 1. A shotput has a mass of 7.0 kg. Find the potential energy of a shotput raised to a height of 1.8 m. m = 7.0 kg h.

Energy is the ability to do work or cause change.

Physical Science Chapter 13 Section 3

Physical Science Chapter 15 Review Game

Mechanical Energy.

Chapter 5.2 Review.

Presentation transcript:

Energy #1 1. What’s the PE of a 142.3 kg rock located at a height of 8.4m above the floor? 2. How much work did it take to raise the rock to that height? 3. How much work could gravity do if it falls from the 8.4m height to the floor? 4. If it fell and did work over 11.4 s, what was the power output of the rock?

Energy #2 1. What is the PE of a high diver who has a mass of 50kg and is 80m above a pool? 2. How fast would she be going when she hits the pool? 3. As she falls through the air, her PE____, her KE ____, and her total mechanical energy_____

Energy #3 A plane is carrying a 1966 apricot VW Beetle (m=1000kg), and is flying at an altitude of 4800m at 45 m/s. a.) What is the potential energy of the VW? b.) If the car is dropped out of the plane, what will be its vertical velocity when it hits the ground? c.) How many seconds will it fall? d.) How far horizontally will it travel during its fall? e.) How much work does the plane do on the car if it carries it for 3000m before dropping it?

Energy #4 How does the KE of an object going 5 m/s compare to the KE of an object going 10 m/s? What happens to the KE of an object if its mass is tripled and the velocity stays the same? What happens to the KE of an object if the mass is cut in half and the velocity doubles?

Energy #5 If the KE of a 9.2kg object is 627J, how fast is it going? What’s the gravitational potential energy of a 2x106kg rock located on top of the head of a 16.4m high hampster? If a 427kg watermelon has 6.32x107J of PE, how high is it?

Energy #6 What is the spring constant of a bungee cord if a 100kg person causes it to stretch 5m? (static weight, not falling) What’s the elastic PE in a spring (k=1.4N/m) that is stretched 0.82m?

Energy #7 If a force of 23N stretches a spring 0.54m, what is the spring constant? A 2kg ball is placed in front of the spring above. How fast will the ball move when the spring is released?

Energy #8 An 800kg car is traveling 15m/s. Find the KE. It comes to rest due to friction after 25m. How much work was done by friction? What is the frictional force acting on the car?