Question

Which of the following equations or principle is most suitable to solve given question.

A string is stretched by 1,000 N force. Calculate the tension in the string.

• A. Newton's first law ( law of inertia)
• B. Newton's second law ($F_{net}$ = ma)
• C. Newton's third law (For every action there is an equal and opposite reaction)
• D. Newton's law of universal gravitation
• E. Conservation of linear momentum

Answer 1

Answer: (C)

Newton's third law (For every action there is an equal and opposite reaction)

According to Newton's third law, for the force exerted externally on the string to stretch it, there would be a reaction corresponding to it, which is the force that the string exerts on its ends. The force would be called tension with magnitude being same as that of external force=$1000N$