Question

An object moving on a horizontal, frictionless surface makes a glancing collision with another object initially at rest on the surface. In this case which of the following is true about momentum and kinetic energy? 4A) Momentum is always conserved, and kinetic energy may be conserved. (B) Kinetic energy is always conserved, and momentum may be conserved. (C) Momentum is always conserved, and kinetic energy is never conserved. (D) Both momentum and kinetic energy are always conserved. (E) Neither momentum nor kinetic energy is conserved.

Answer 1

Answer:

A) Momentum is always conserved, and kinetic energy may be conserved. TRUE

(B) Kinetic energy is always conserved, and momentum may be conserved. FALSE

(C) Momentum is always conserved, and kinetic energy is never conserved. FALSE

(D) Both momentum and kinetic energy are always conserved.

FALSE

(E) Neither momentum nor kinetic energy is conserved.

FALSE

Explanation:

A) Momentum is always conserved, and kinetic energy may be conserved.

Always the momentum is conserved for any collision.

(B) Kinetic energy is always conserved, and momentum may be conserved.

In inelastic collison the Kinetic energy is not conserved.

(C) Momentum is always conserved, and kinetic energy is never conserved.

For elastic collision  the kinetic energy is always  conserved.

(D) Both momentum and kinetic energy are always conserved.

The kinetic energy never is conserved in an inelastic collision.

(E) Neither momentum nor kinetic energy is conserved.

The momentum always is conserved.