If a cloth covers a table and some dishes are kept on it, then the cloth can be pulled out without dislodging the dishes from the table by pulling the cloth suddenly. The dishes will remain on table due to:
1. Work-energy theorem
2. For every action, there is an equal and opposite reaction
3. Inertia of motion
4. Inertia of rest
View Answer
According to Newton's first law of motion, the dishes tend to remain at rest due to their inertia of rest when the cloth is suddenly pulled.
Read the statements marked as assertion (A) and reason (R) and choose the correct option.
Assertion (A): If no external force acts on a system, the velocity of the centre of mass remains constant.
Reason (R): If there is no external force on system, then momentum of system is conserved.
1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true
View Answer
When no external force acts on the system, the acceleration of the center of mass is zero, hence its velocity is constant. This also implies the conservation of total linear momentum of the system.