Physics 2 Flashcards
What is a lever?
It’s an example of a simple machine. A simple machine is anything that can be used to make effort easier to do.
What’s a pivot?
A fixed point around which the lever turns.
What’s a load?
Force you want apply a force to.
What’s an effort?
Force applied by you.
What’s a force multiplier?
They reduce the effort needed to move the load by increasing the distance over which it’s acting.
What can you use the energy in water waves for?
electricity
If the object doesn’t move ….
there is no work
What happens when you heat things up?
Heating changes the movement of particles by making them vibrate more and faster.
The energy you need to increase the temperature of a material depends on…..
the mass of the material and how much the temperature needs to rise.
What is thermal conductivity?
A measure of how easily energy can pass through material.
What’s a conductor?
Thermal energy is transferred easily.
What’s an insulator?
Do not transfer thermal energy easily.
When trying to trap heat…
conductors aren’t good.
What is a sound wave?
They transfer energy. They work by vibrating a medium, usually air, backwards and forwards to produce different frequencies which our ears hear as sound.
What do longitudinal waves need?
they need particles to transfer energy.
What is the amplitude?
It is the maximum height from the rest position of the wave. Distance between the middle and the curve.
What is a transverse wave?
Transverse waves are the waves which are perpendicular to the wave motion.
What is the electromagnetic spectrum?
It’s a continuous spectrum, separated out into different bands of frequencies.
What are the different electromagnetic waves?
Gamma rays X-rays Ultra violet Visible light Infrared Microwaves Radio waves
What electromagnetic wave has the highest frequency?
Gamma rays
What electromagnetic wave has the longest wavelength?
Radio waves
What is ionisation energy?
a process where electrons are ‘knocked’ out of other atoms.
What are the most dangerous electromagnetic waves?
Gamma and X- Rays
What is a longitudinal wave?
When particles vibrate back and forth in the same direction the wave travels.
What is a wavelength?
The distance between 2 corresponding points on a wave, measured in metres.
What does it mean when waves superpose?
They will either add up or cancel out.
If the waves are in ____ they will add up (constructive interference) creating a ____ wave with a _____ amplitude.
phase
single
greater
If the waves are ___ in phase they then ____ out (destructive interference) giving us a ____ amplitude.
not
cancel
reduced
