Thanks for the responses but why doesnt mass affect this, like mg?
This is actually a very interesting question that led Einstein to formulate the theory of general relativity. Here's some background.
You may know/will learn that the centripetal force required to move in a circle of radius r at speed v is
. If you measure your forces from your own rotating perspective, you will feel a centrifugal force of the same magnitude pushing you outwards. However, the centrifugal force isn't a real force; it comes about because you're accelerating and any accelerating person will measure 'incorrect' force values.
The force that you measure is proportional to your mass, like with gravity. It is what we call an inertial or fictitious force. No physical force, aside from gravity, is proportional to the mass. However, all inertial and fictitious forces are proportional to the mass. This led Einstein to believe that gravity isn't a force, but is just acceleration, like the centripetal acceleration above. In his model, free fall is motion with no acceleration. This may seem counterintuitive, but in a vacuum, if you're free falling and you let go of something, that object 'falls with you', because gravity accelerates it at the same rate. Therefore, ironically, when you're free falling, you can't detect the influence of gravity.
Tl;dr, gravity is special, it's the only force you'll study that has a constant acceleration for all masses.
Need help with some homework - Thermodynamics U1
1)Give two reasons why you feel cooler when the wind is blowing than you would in still air at the same temperature.
2) In humid weather, evaporation of perspiration takes place as it does in dry weather. However, the cooling effect is greatly reduced. Why?
3) In hot weather, sweat evaporates from the skin. Where does the energy required to evaporate the sweat come from?
1. Convection: the wind is cold, so more cold air hits your skin and draws heat away. Evaporation: the wind draws warm water vapour away from your skin.
2. In humid weather, you're surrounded by warm water vapour. The water from your body can't really escape because the vapour pressure is high.
3. The hot weather and your body both supply energy to evaporate the water on your skin.