Question

identify the machines in which both a lever and a wedge are used

Explanation:

Step1: Recall lever and wedge definitions

A lever is a rigid bar rotating around a fulcrum. A wedge is a triangular - shaped tool that splits objects or holds them together.

Step2: Analyze each machine

• Shovel: The shovel can act as a lever (with the hand as a fulcrum - like point and the force applied to lift) and the blade of the shovel is a wedge (used to dig into the ground, splitting the soil).
• Scissors: Scissors have two levers (the two blades and handles rotate around the pivot - fulcrum) and the blades are wedges (used to cut materials by splitting them).
• Faucet: A faucet is a wheel - and - axle simple machine, not a lever or wedge in the relevant sense here.
• Ladder: A ladder is an inclined plane - type structure for climbing, not a lever or wedge.

Answer:

The machines in which both a lever and a wedge are used are the shovel and the scissors.