Question

barry has a mass of 65 kilograms and is doing pull - ups. which statement describes how newtons first law of motion is involved in this interaction? the pull - up bar pulls up on barry with the same force that barry pulls down on the pull - up bar. barry will remain at rest until he pulls down on the pull - up bar. barry has to use more force to do a pull - up if he wears a 20 - kilogram weight belt than if he is pulling only his body weight.

Explanation:

Newton's first law (law of inertia) states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Barry is initially at rest and remains so until he exerts a force on the pull - up bar to start the pull - up motion. The first option is Newton's third law (action - reaction), and the third option is related to Newton's second law (F = ma).

Answer:

Barry will remain at rest until he pulls down on the pull-up bar.