Question

1. the ____ reduces friction and helps robots move smoothly.

5 points
○ wedge
○ wheel and axle
○ screw

Explanation:

To solve this, we analyze each option:

• Wedge: Used for splitting or lifting, not reducing friction for movement.
• Wheel and axle: Converts rotational to linear motion, reduces friction (rolling friction < sliding friction) to help smooth movement (e.g., robot wheels).
• Screw: Used for holding or lifting via rotation, not for smooth movement by reducing friction.

So the wheel and axle is the correct choice.

Answer:

B. wheel and axle