it is the same as adding a negative number to a positive number
Yes. A simple case would be a vector 2a acting at a point in one direction and two vectors, each of magnitude a, acting at the same point in the opposite direction.
Working or acting together. The word comes from "co" meaning together, and "ordinate" which means "direction". The implication is that the parts are going in the same direction together.
As soon as you let go of the coin, there will be no upwards force acting on the coin and so no upward acceleration. There will be downwards acceleration due to the force of the earth's gravity. If you want to be more accurate you could include aerodynamic drag which will operate in the direction opposite to that of the motion.
Vectors are often represented by arrows whose length is proportional to the magnitude of the vector. The arrowhead points to the direction the vector is acting. You'll have to decide if such an arrow fits your definition of a line.
A vector of 13 acting on O at an angle of 60 degrees.
It is the same as adding a positive and adding a negative number
That is equivalent to adding a positive number and a negative number. If the forces have the same magnitude, it is the same as adding a number and its additive inverse.
as adding a ".... in the opposite direction.
A negative force. Since the force added in the opposite direction works against the original force, you would subtract the added force from the original force. Since subtracting a positive is the same thing as adding a negative, this force would be considered negative to the positive direction.
Forces are vector quantities. This means they have both a magnitude and direction associated with them. If you add vectors going in the opposite directions it is the same as subtracting one from the other. Therefore, the resultant force is the difference between the forces.
Forces are vector quantities. This means they have both a magnitude and direction associated with them. If you add vectors going in the opposite directions it is the same as subtracting one from the other. Therefore, the resultant force is the difference between the forces.
A negative force. Since the force added in the opposite direction works against the original force, you would subtract the added force from the original force. Since subtracting a positive is the same thing as adding a negative, this force would be considered negative to the positive direction.
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It is a vector with the same magnitude (size) but acting in the opposite direction.
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A force of equal magnitude, acting in the opposite direction.
gravity