pHYSICS

what do you call reaction force

normal contact force

what is newtons first law

Unless acted on by an external force, an object will remain stationary or moving at constant speed

what is newtons second law

F=ma

what is newtons third law

If object A exerts a force on object B, object B simultaneously exerts a force of equal magnitude but opposite direction back on object A.

give non-renewable energy

fossil fuels, nuclear

give renewable energy

bio-fuel, wind, hydroelectricity, the tides and the Sun

4 examples of transverse waves

• ripples

• s waves

• vibrations

• EM waves

3 examples of longitudinal waves

• p waves

• sound waves

• pressure waves

how does sound work in ear

how do foetal scans work

properties of p waves

• longitudinal

• faster

• travel through solids and liquids

properties of s waves

• transverse

• slower

• travel through solids only

• (s stuff only)

are sound waves faster in solids or liquids

• The closer together molecules are, the faster the wave can transfer energy, therefore:

  • Sound waves travel fastest in solids

  • Sound waves travel slowest in gases

why is sound faster in solids