Answer:The friction force acting on a sliding object is determined by the coefficient of friction between the surfaces in contact, the normal force acting on the object, and the direction of the force. The coefficient of friction is a measure of how easily the two surfaces will slide against each other, and the normal force is the force that the surface exerts on the object perpendicular to the surface.
To determine the friction force acting on the 20 newton wooden box sliding across a wooden surface, you will need to know the coefficient of friction between the two surfaces and the normal force acting on the box. If you don't know these values, it will be difficult to determine the friction force.
In general, the friction force acting on a sliding object is given by the following formula:
Friction force = coefficient of friction * normal force
So, if you know the coefficient of friction and the normal force, you can use this formula to calculate the friction force. For example, if the coefficient of friction between the two surfaces is 0.5 and the normal force acting on the box is 10 newtons, the friction force would be 5 newtons (0.5 * 10 = 5).
I hope this helps! Let me know if you have any other questions.
Step-by-step explanation: