Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11

# A Bullet Hits a Block Kept at Rest on a Smooth Horizontal Surface and Gets Embedded into It. Which of the Following Does Not Change? - Physics

MCQ

A bullet hits a block kept at rest on a smooth horizontal surface and gets embedded into it. Which of the following does not change?

#### Options

• linear momentum of the block

• kinetic energy of the block

• gravitational potential energy of the block

•  temperature of the block.

#### Solution

gravitational potential energy of the block

When the block kept at rest is hit by a bullet, the block acquires certain velocity by the conservation of linear momentum.
Therefore, the linear momentum and the kinetic energy of the block change.
As some of the kinetic energy carried by the bullet transforms into heat energy, its temperature also changes.
However, the gravitational potential energy of the block does not change, as the height of the block does not change in this process.

Concept: Momentum Conservation and Centre of Mass Motion
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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 9 Centre of Mass, Linear Momentum, Collision
MCQ | Q 9 | Page 158