Final answer:
To calculate the resistance of a screw, use the formula R = (P * F) / (2 * π * r), where R is the resistance, P is the pitch, F is the effort force, and r is the radius of the screw.
Step-by-step explanation:
To calculate the resistance of a screw, you would need the pitch, diameter, and effort force. The resistance force of a screw can be determined by multiplying the pitch by the effort force and dividing it by the circumference of the screw. The formula for resistance is R = (P * F) / (2 * π * r), where R is the resistance, P is the pitch, F is the effort force, and r is the radius of the screw.