Mike and Juan were studying forces and decided to do an experiment. they placed four
equally sized blocks made of different materials on an elevated plastic tray. They watched
each of the blocks move down the tray. their setup is shown in the picture.

Friction.

Explanation:

The is friction because the blocks are different substances, and different substances are able to move across different flooring more easily.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.