external resistance的意思|示意

'

External resistance is a term used to describe any force that is acting on an object in order to oppose its motion. It is often used to describe forces acting on an object from outside itself, such as the force of gravity acting on an object, the drag force acting on a moving object in the air, or the frictional force acting on the object.

External resistance can be measured in Newton's, which is a unit of force. The force can be applied in a number of different directions, such as up, down, left, right, forwards, or backwards. For example, a moving car will experience external resistance in the form of friction between the tires and the ground, which is represented by a force in the opposite direction of the car's motion.

External resistance can also be used to describe other types of forces. For instance, when an object is placed in a fluid, such as air or water, it experiences a drag force, which is an external type of resistance. This resistance is produced due to the viscous nature of the fluid, and is represented by a force that acts in the opposite direction of the object's motion.

External resistance can be an important factor in determining an object's motion. By adding or subtracting external resistance, an object's motion can be changed in different ways, such as slowing it down or speeding it up. It can also be used to calculate the energy required to move an object from one point to another, and can help engineers design efficient systems.