Friction is the resistance force that occurs when two surfaces come into contact and slide against each other. It is caused by the irregularities and bumps on the surfaces that hinder smooth motion.
Friction can either increase or decrease the movement of a cart, depending on the direction in which it acts. If the friction force is in the opposite direction of the cart's motion, it will slow down the cart. On the other hand, if the friction force is in the same direction as the cart's motion, it can help the cart move faster.
The amount of friction depends on the nature of the surfaces in contact, the force pressing the surfaces together, and the relative speed at which the surfaces are moving. Rougher surfaces, heavier loads, and faster movement generally result in higher friction.
Friction can be reduced by using materials with smoother surfaces or by adding a lubricant between the surfaces. Additionally, reducing the weight of the cart or decreasing its speed can also help reduce friction.
The mass of a cart itself does not directly affect the friction force. However, a heavier cart may require more force to overcome the friction force and start moving. Similarly, a heavier cart may experience more friction when it is in motion, making it harder to stop or slow down.