Forces, Work & Energy Integration

REF STUDY GUIDE: Big Ideas Use to answer form questions

1.Work as Energy Transfer: Work equals force times distance (W = F x d), measured in joules — when you lift a book off the floor, you do work on it by applying an upward force over the distance it rises, transferring energy into the book.

2.Work and Energy Changes: Doing work on an object changes its energy — pulling a roller coaster car to the top of a hill converts the work you do into gravitational potential energy (PE), which then becomes kinetic energy (KE) on the way down.

3.Power and Machines: Power is how fast work gets done (P = W/t), measured in watts — a powerful motor and a weak motor can do the same work, but the powerful one finishes faster, which is why elevators need high-power motors.

4.Simple Machines and Mechanical Advantage: Simple machines like ramps, levers, and pulleys reduce the force needed by increasing the distance over which you push or pull — they do not create extra energy, they just redistribute the effort.

DRAW KEY TERMS Google each → Images tab → sketch what you see

Joule

Unit of work and energy (1 J = 1 N·m = 1 kg·m²/s²)

Watt

Unit of power (1 W = 1 J/s)

work

Force applied over distance; transfers energy (W = F × d)

power

Rate of doing work; how fast energy is transferred (P = W/t)

WRITE FOCUS QUESTION Your initial thinking

An elevator in a tall building lifts dozens of people many floors — yet the electric motor that drives it is surprisingly small. Engineers use pulleys and counterweights so a modest motor can move loads far heavier than itself.

How can a tiny motor lift a heavy elevator?

I think...

WRITE AFTER HOOK FORM Reflect before continuing

I learned that...

Station 1 — Work = Force × Distance

I observed that...

This shows that...

The key concept is...

Station 2 — Mechanical Systems - Power & Efficiency

The data shows...

This connects to...

The main idea is...

This connects to what we learned because...

I can apply this by...

DRAW CONCEPT MODEL Show your understanding visually

Draw a model that shows the main concept. Include labels and arrows to explain relationships.

Labels included

Relationships shown

Key terms used

CHECK TEST YOUR THINKING Rate each: FALSE ← 1-2-3-4-5 → TRUE

1. Simple machines like levers and pulleys create extra energy to make work easier.

F12345T

2. If you push hard on an object but it does not move, you have still done work on it.

F12345T

3. A ramp reduces the total amount of work needed to lift an object to a certain height.

F12345T

4. The amount of effort you feel is the same as the scientific definition of work.

F12345T

5. A machine with a higher mechanical advantage always does more work than one with a lower mechanical advantage.

F12345T

Pick any TWO statements — especially any you rated 2, 3, or 4. Justify your rating with evidence:

Statement #___ — I rated it ___ because:

THINK SCIENTIST CIRCLE DEBRIEF Reflect after your Scientist Circle discussion

AHA! Moment

The one I changed my thinking most about is...

Remaining Question

I still wonder...

WRITE FOCUS QUESTION REVISIT Final written response

How can a tiny motor lift a heavy elevator?