Question

In an experiment, students release a block from rest at the top of an inclined plane. The block slides down the plane through a vertical displacement h, and the students measure the speed v of the block using a photogate. The students expect the speed of the block at the end of this motion would be v=2gh−−−√. However, the measured v is significantly different. Which of the following is the most probable source of error the students should cite in their lab report?

A) The accuracy of the photogate

B) Friction

C) Mass of the block

D) Variations of the force of gravity

E) Air resistance

Answer 1

Answer :

the following is the most probable source of error the students should cite in their lab report :

• (B) Friction.

Because, Some of the energy will be wasted doing work against the friction. So, the final kinetic enegy of the block will be less than the expected value.