Chapter 6
How Forces Affect Motion
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

A weightlifter lifts a barbell. List two forces that are acting on the barbell. Are these forces balanced if the weightlifter keeps the barbell steady? [Pg. No. 97]

Question image

Answer: Verified

Two forces acting on the barbell are:

(1) Gravitational force (weight) acting downward due to the Earth.

(2) Muscular force exerted by the weightlifter acting upward.

If the weightlifter keeps the barbell steady, these forces are balanced because the upward force is equal to the downward gravitational force. Hence, the barbell remains at rest.

Download Free PDF
(All Q's of this Chapter solved)
More NCERT Questions
Why does a canoe move forward when the canoeist pushes water backwards with their paddle and why does it move faster when they push harder? [Pg. No. 94] Suppose the same canoeist uses the same paddle force in two different canoes, one empty and one carrying another passenger. In which case will the canoe move faster? [Pg. No. 94] An object is moving with a constant velocity. Is there a net force acting upon it? [Pg. No. 101] Two players R and S are participating in an arm-wrestling match. At the instant, when the arms tilt to the front direction (out of the page towards you), are the forces exerted by the players balanced