Question

A man is using a chest expander. Which kind of force is acting on the man and the equipment he is using ?
A)Elastic spring force
B) Gravitational force
C) Frictional force
D) All the above​

Answer 1

Answer:

B)gravitational force

Explanation:

Answer 2

Force acting on the man is A)Elastic spring force and the equipment he is using is 'Machine fly' or 'Pec Dec fly'.

Chest expander can be done by small strand pulling machine.

It can also be achieved through gym machine, named 'Machine fly'.

Both the machines use springs.

The springs are stretched by the force of person, thus it applies force on muscles of chest and arms too.