Question

select the correct images. identify the arrows that show input force.

Explanation:

Step1: Recall input - force concept

Input force is the force applied to a machine to make it do work.

Step2: Analyze lever image

In the lever - barrel image, the downward arrow on the lever is the input force as it is the force applied by the user to lift the barrel.

Step3: Analyze pulley image

In the pulley - block image, the downward arrow on the rope is the input force as it is the force applied to lift the block.

Step4: Analyze wheel - barrow image

In the wheel - barrow image, the upward arrows on the handles are the input forces as they are the forces applied by the user to lift the load in the wheel - barrow.

Answer:

The downward arrow on the lever in the lever - barrel image, the downward arrow on the rope in the pulley - block image, the upward arrows on the handles of the wheel - barrow.