### How big is the upward force compared to the downward force?

It depends entirely on the situation. If the object is resting, the upward and downward forces must be equal. On a planet, like Earth, this would make the normal force (upward) and gravitational force (downward) the same quantity. In outer space, it would simply be inertia. If the object is falling, the upward force is less than the downward force. If the object is rising, the upward force is greater than the downward force.

### How do you calculate the force that make an object mass rises to an distance vertically?

1). First of all, in order to make an object rise at all, an upward force must be applied to it, and the force must be greater than the object's weight. 2). If an upward force exactly equal to the object's weight is applied to it, then the object can "hover" wherever you put it, as if it is weightless, but it can't rise. 3). If the upward force is greater than the object's weight…

### What is the relationships between force and pressure?

Archimedes a Greek mathematician who lived in third century, dicovered how to determine buoyant force. Archimedes' principle states that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces. Buoyant force is the upward force that keeps an object immersed in or floating on a liquid.

### What is the upward force acting on an object in fluid?

The upward force is what's called the "buoyant force". It's exactly the weight of the fluid that would be in the space occupied by the object if the object were not there. What is the object doing ? Is it sinking ? Then the buoyant force is less than the weight of the object. (A rock.) Is it rising ? Then the buoyant force is greater than the weight of the object. (A basketball forced…

### Does an item going up get lighter in weight?

No. Weight is the perceived force due to gravity pulling down on an object. The force of gravity doesn't change due to an object's motion. The fact that an object seems "lighter" at the end of lifting it is because its upward momentum and the law of inertia causing the object to continue moving upward until the force of gravity stops the upward motion.

### Why does a projectile move upwards when thrown upwards even though a force of gravity acts downwards on it?

In the act of "throwing", the thrower imparts an upward velocity to the object, by temporarily applying an upward force to it that's greater than the downward force of gravity. During that brief period, the sum of the forces on the object is directed upward, so it accelerates in that direction. After the throwing ends, however, the only force on the object is the force of gravity, directed downward, so its acceleration is downward. That…