Final answer:
To calculate the coefficient of friction of a block of wood, use the equation friction force = coefficient of friction x normal force. Determine the normal force by multiplying the mass of the block by the acceleration due to gravity, then rearrange the equation to solve for the coefficient of friction.
Step-by-step explanation:
The coefficient of friction can be calculated using the equation:
friction force = coefficient of friction x normal force
In this case, the block has a dynamic friction force of 45 Newtons. To determine the coefficient of friction, we need to know the normal force acting on the block. The normal force is equal to the weight of the block, which can be calculated as the mass of the block multiplied by the acceleration due to gravity.
Once we have the normal force, we can rearrange the equation to solve for the coefficient of friction.