Nothing fuels a comet. They are just ice balls orbiting the Sun forever (until they run into something). By the way, the tails of comets do not stream out behind them. The tails of comets always point away from the Sun.
The comet is kept in orbit around the sun by the gravitational pull between the comet and the sun. This gravitational force acts as a centripetal force, keeping the comet moving in its elliptical orbit.
By the vector sum of the forces. When the forces act exactly in opposite directions, you subtract one force from the other. When they act at some other angle, the calculation is a bit more complicated.
Normal force can act on an object
When a pen is hanging, two forces act on it - the upthrust and the force of tension in the string.
Then the objects will move in the direction of the resultant force.
The comet is kept in orbit around the sun by the gravitational pull between the comet and the sun. This gravitational force acts as a centripetal force, keeping the comet moving in its elliptical orbit.
When two forces act in the same direction, they will combine to produce a resulting force equal to the sum of the individual forces. This combined force will act in the same direction as the individual forces.
The three forces that act on an object are gravity, friction, and applied force.
If many forces act in the same direction on an object, then the net force is their sum.
external force and internal force
cohesive force and Adhesive force
That depends on the direction of the forces. If the two forces act in the same direction, the resultant force will be doubled and if the two forces act in the oppsite direction, the resultant force will be null or zero.
Long range forces are forces that act over a distance.
Some forces that act on objects without touching them include gravitational force, magnetic force, and electric force. These forces can exert a push or pull on objects even when they are not in direct contact with them.
To find the net force when two forces act in the same direction, simply add the magnitudes of the two forces together. This will yield the total net force acting on the object in the direction of the forces.
By the vector sum of the forces. When the forces act exactly in opposite directions, you subtract one force from the other. When they act at some other angle, the calculation is a bit more complicated.
To calculate the net force when multiple forces act in the same direction, simply add the magnitudes of the individual forces together. The direction of the net force remains the same as the original forces.