Does the kinetic energy of an object which moves with constant velocity. Class 9

Does the kinetic energy of an object which moves with constant velocity. Class 9

Question 1.

Does the kinetic energy of an object which moves with constant velocity change with its position? (Page 123)

Answer:

No. Kinetic energy K = 1/2mv². If velocity is constant, v does not change regardless of position. Since mass m is also constant, kinetic energy remains unchanged as the object moves to different positions.

Question 2.

Does the potential energy of an object near the surface of the Earth change if it moves with constant velocity in the horizontal direction? What if the object is gradually raised in the vertical direction? (Page 126) Class 9

Answer:

1. Horizontal motion at constant velocity: No change in potential energy. U = mgh depends only on height h. Horizontal motion does not change h, so U remains constant.
2. Vertical motion (raised upward): Yes, potential energy increases. As h increases, U = mgh increases proportionally. The work done against gravity gets stored as gravitational potential energy.