Topic · 9 games
How much mass is packed into each cubic centimetre decides what sinks and what floats. Water pushes up with the weight of the water an object pushes aside, and it presses harder the deeper you go: ρ = m ÷ V, F_b = ρ·g·V, p = p₀ + ρ·g·h.
PLAY NOW · 43
Lower a block, a crown, and a stone into a measuring cylinder. Read the volume from the rising water, work out ρ = m ÷ V, and find out whether the king's crown is pure gold.
PLAY NOW · 44
A floating barge sinks until the water it pushes aside weighs as much as it does. Predict its waterline, load it to the brim without flooding, and find out why steel boats float.
PLAY NOW · 45
Every 10 m of seawater adds about one atmosphere. Read a submarine's gauge, find the deepest dive its hull can take, and see why fresh water lets it go a little deeper.
PLAY NOW · 46
Hang a stone from a spring scale and lower it into a can full to the spout. The scale loses exactly the weight of the water that spills out. Use it to find volumes, densities, and depths, in water and in oil.
PLAY NOW · 47
Air pushes up too, with the weight of the air a balloon pushes aside. Count party balloons for a toy, load and heat a hot-air balloon, fly from a mountain, and lift a person on helium.
PLAY NOW · 48
Turn a tube of mercury upside down and watch the air hold up a 760 mm column. Find the air pressure on a mountain, and why a suction pump can't lift water more than about 10 m.
PLAY NOW · 49
In 1654 two teams of horses could not pull apart two metal halves held together only by the air. Find the force, F = Δp·π·r², count the horses, and see what a suction cup can hold.
PLAY NOW · 50
Oil passes pressure on to every part of a lift, so a small push on a small piston lifts a car on a big one. Find the push, the piston sizes, and the long way the small piston has to travel.
PLAY NOW · 51
Pour a little water into a tall thin tube on a sealed barrel and the pressure reaches every wall. Find the height that pops the lid, see why the tube's width doesn't matter, and push a cork into a bottle.
11 games
Position, velocity, acceleration, and gravity.
2 games
Units, SI prefixes, and scientific notation.
3 games
Rearranging formulas: inverse operations and unit checks.
3 games
Vector addition, displacement, and forces.
3 games
Right triangles, inverse functions, and the unit circle.
3 games
Horizontal and angled launches: two motions at once.
3 games
Uniform circular motion, angular velocity, and centripetal force.
3 games
Newton's law of universal gravitation, weight, orbits, and Kepler's laws.
3 games
Force equilibrium, cable tension, torque, and support reactions.
5 games
Torque, lever arms, tipping, and angular acceleration.
3 games
Centre of mass, balance points, composite objects, and toppling.
3 games
Flow, Bernoulli's principle, jets, pipes, and lift.
10 games
Amplitude, period, frequency, pendulums, springs, energy, and resonance.
27 games
What a wave is, amplitude, wavelength, frequency, period, and sound.
10 games
Electric charge, electrons, and the forces between charges.
16 games
Voltage, current, resistance, and the energy circuits carry.