air pressure
The upthrust exerted by surrounding air on the balloon.
Air fill the balloon and force it to expand but being a rubber base substance the balloon always in the state of pushing the air (that's why if you put a hole on a balloon it will "fly"). Air pushing is an action. Balloon pushing back is a reaction.
This is because there is always the same amount of air inside the balloon, providing the same amount of outwards force. Here on the ground, that outwards force is balanced by the air outside the balloon pushing on it. Higher in the atmosphere, however, there is less air, and therefore less force. Thus as the balloon ascends, there is a greater force pushing out than pushing in, and the balloon bursts.
The downward force of gravity, and the upward buoyant force resulting from the low density air inside the balloon.
As in balloon-powered rockets, a reduction in energy within the balloon can be accompanied by force exerted to move the balloon, or another object. The energy stored in a balloon is in the form of higher pressure stretching it out. If the balloon has an opening, the air will be forced out until the balloon regains its unstretched shape. At that point, air inside the balloon is at the same pressure as the air outside the balloon. Other containers can also store air at a pressure higher than the outside air. This can also provide force when the stored energy is released.
The upthrust exerted by surrounding air on the balloon.
A balloon powered car is moves because the balloon pushes out air. Whenever something exerts a force on something else (in other words, the balloon is exerting force on the air), then the object being pushed always exerts an equal and opposite reaction force on the object exerting force on it (in other words, the air exerts force on the balloon). Because the balloon is attached to the car, when the balloon is pushed by the air, the car is pushed. The law that for every force there is an equal and opposite reaction force is Newton's Third Law of Motion.
Air fill the balloon and force it to expand but being a rubber base substance the balloon always in the state of pushing the air (that's why if you put a hole on a balloon it will "fly"). Air pushing is an action. Balloon pushing back is a reaction.
This is because there is always the same amount of air inside the balloon, providing the same amount of outwards force. Here on the ground, that outwards force is balanced by the air outside the balloon pushing on it. Higher in the atmosphere, however, there is less air, and therefore less force. Thus as the balloon ascends, there is a greater force pushing out than pushing in, and the balloon bursts.
Erm.. no.. i believe its Buoyancy... this force causes u the hot air balloon to rise.. not Gravity..
The downward force of gravity, and the upward buoyant force resulting from the low density air inside the balloon.
As in balloon-powered rockets, a reduction in energy within the balloon can be accompanied by force exerted to move the balloon, or another object. The energy stored in a balloon is in the form of higher pressure stretching it out. If the balloon has an opening, the air will be forced out until the balloon regains its unstretched shape. At that point, air inside the balloon is at the same pressure as the air outside the balloon. Other containers can also store air at a pressure higher than the outside air. This can also provide force when the stored energy is released.
the volume of air inside the balloon increases while the pressure of balloon decreases thus balloon inflates
No. A hot air balloon is a solid object. That is, the basket, the ropes, the burner and the envelope itself are not gasses. The air within the envelope is a gas, of course; heated atmospheric gasses in fact. But the balloon itself is not a gas.
the balloon works with the poplo force forcing it up
a helium balloon is forced upward by buoyancy. a object is forced upward by a force equal to the weight of the fluid it displaces. this also applies to gases. the gas helium is lighter than average atmospheric air, that is that equal volumes of atmospheric air and helium do not weigh the same. This means that the volume displaced by the balloon is heavier than the balloon itself. since the air weighs more it applies more force upwards on the balloon than the balloon applies downwards on the air, therefore it rises. However, a helium balloon will not go down unless a force such as large air resistance (heavy wind etc.) is applied to it. hope this helps.
The force that lifts a hot air balloon is called buoyancy.