April 29th, 2014

Do Now: Write how you connect to today’s quote on my Edmodo Wall.

Quote of the Day: “Be More Concerned with your character rather than your reputation; your character is who you are, while your reputation is just who others think you are.” - John Wooden

Agenda: April 29th , 2014Objective: I can challenge myself to become proficient in determining when work is done for a mechanical system, by the end of the unit. Outcomes-{Let’s Talk}: When is Work Done{Let’s Learn}: Work Energy Theorem{Let’s Push Your Thinking}: CSI training

packet Express Yourself}

WHAT IS WORK ? (IN PHYSICS)

Work

{Quick Check}: Let’s Review

In a physical sense, which do you think is more work? • Holding a 100 kg weight above your head. • Pushing really hard against a wall to the point of

exhaustion• Lifting a 10 kg weight above your head from the

floor• Pushing a 50kg box across the floor at a

constant velocity• Studying all night long for a physics test

What is Work?Work is a force action over some distance to cause a change in energy. The amount of work done depends on two things: a. The amount of force exerted and b. The distance over which the force is applied. There are two factors to keep in mind when

decidingwhen work is being done: something has to

move and the motion must be in the direction of the applied

force. Work can be calculated by using the following

formula: Work=force x displacement

Units of Work

Work = Force x Displacement

The unit of force is Newtons (N)The unit of displacement is meters (m)

The unit of work is newton-meters (N-m)One newton-meter is equal to one joule (J)

So, the unit of work is a joule.Work is a scalar, like energy.

Work is done on the books when they are being lifted, but no work is done on them when they are being held or carried horizontally.

{Let’s Visualize}: Coggle.it

Create A Coggle Mindmap entitled “Physics by: you” :including the following terms with images, definitions and equations:

1. Work2. Energy3. Momentum4. Acceleration5. Force6. Vectors7. Scalars

Express Yourself

Connect: How did mind-mapping help you visualize the connections between physics concepts to ideas that you already know?

Extend: What new ideas from the lessons on work and energy did you get that extended/shifted your thinking?

Challenge: What challenges or questions have come up in your mind after conducting today’s assignment?