Physics Quiz part 2

What is always true about a couple acting on a rigid body?

State the definition of force in terms of momentum.

Two forces act on an object (let's say the angle between them is 110 degrees). How do you calculate their resultant force?

A firework explodes into two fragments moving in opposite directions. One fragment has three times the mass of the other. Explain how to find the velocity of the smaller fragment given the total kinetic energy after the explosion.

Write and explain the expression for the work done by a constant force.

A mixture of water and glycerine is made. Their volumes and densities are known. Explain how to calculate the density of the mixture.

What is the same for two wires of different lengths and diameters made from the same material?

Define the limit of proportionality on a force-extension graph.

A source of sound moves away from an observer. Describe the change detected in frequency and wavelength.

What does the ability of a wave to be polarised reveal about its type?