Reach for the Star

Speed density and pressure · Optional extension

L066 · Allow 10–15 minutes for learners ready to move on. Answers are available after an attempt.

Stretch

A solid has density 7.8 g/cm³ and volume 25 cm³. Find mass.

Reveal a worked check after attempting

m=ρV=195 g.

Deep challenge

Pressure doubles while force is constant. What happened to contact area? Explain algebraically.

Reveal a worked check after attempting

P=F/A; to double P at fixed F, halve A.

Recall & Review: feedback and extension integration

Lesson L066: Speed density and pressure

Objective: Use speed, density and pressure with consistent units.

60-minute structure: 0-7 Connect & Check; 7-14 Share; 14-25 Present/model; 25-44 Apply route choice/practice; 44-52 independent exam-style check; 52-60 Recall & Review, WWW/EBI and next step.

What Went Well (WWW)

I identified the correct reference quantity, ratio, rate or multiplier and kept the units and proportional relationship clear.

Even Better If (EBI)

I will state the whole or reference quantity, show the multiplier or unit-rate step and check whether the result is sensible in context.

Stretch and deep challenge

Stretch: A solid has density 7.8 g/cm³ and volume 25 cm³. Find mass.

Deep challenge: Pressure doubles while force is constant. What happened to contact area? Explain algebraically.