Question

1. which simple machine reduces friction and helps robots move smoothly?

5 points
○ wheel and axle
○ lever
○ wedge
○ screw

Explanation:

To determine which simple machine reduces friction for smooth robot movement, we analyze each option:

• Wheel and axle: Converts sliding friction to rolling friction (lower friction), enabling smooth motion (e.g., wheels on robots).
• Lever: Amplifies force/movement, not for reducing friction.
• Wedge: Splits objects, uses inclined plane for force, not friction reduction.
• Screw: Converts rotational to linear force, uses friction for holding, not reducing it.

Answer:

A. Wheel and axle