The musculoskeletal system, levers and pressure
Answers are for parents and teachers.
1
A 6-unit load on the left is at 10 cm. How many units at 20 cm on the right balance it?
3
2
An 800 N crate rests on a 4 m² floor area. What is the pressure in Pa?
200
3
What is the water pressure at 8 m depth in Pa? (ρ = 1000 kg/m³, g ≈ 10 N/kg)
80000
4
Identify one muscle pair in your arm (for example at the elbow) and write which bends and which straightens.
The biceps bends the elbow, the triceps straightens it.
5
Why does a knife’s sharp edge cut well? Explain with pressure.
The edge has a tiny area, so the same force produces a large pressure.