Physics

• Light travels faster through air than water, so when light hits water it bends towards the normal line.
• When light passes from denser medium to less dense medium, it bends away from the normal line.
• Light travels at 300 million meters per second, a million times faster than sound
• Light travels in waves and in straight lines.These waves are called oscillations.Light is a transverse wave.
• A year is the amount of time it takes the Earth to orbit the sun
• Current is the result of moving charges(amps)
• A lever(simple machine) is a rigid object that will rotate around a fixed point(pivot)
• Moment is the turning effect of a force.It can be clockwise or anticlockwise.
• Elastic deformation is when an object returns to its original shape when forces are removed