The force that opposes an object in motion is called "friction." Friction is a force that acts in the opposite direction to the motion of an object and it tends to slow down or stop the object from moving. It occurs whenever two surfaces come into contact and rub against each other. To determine the force of friction, you can use the equation: friction force = coefficient of friction x normal force. The coefficient of friction is a value that depends on the types of surfaces interacting, and the normal force is the force exerted by a surface to support the weight of an object resting on it.
