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5/32 MCQs for:

Linear Momentum

Consider two unequal masses, M and m. Which of the following statements is false?

It is possible for the center of mass to lie within one of the objects.

The center of mass lies on the line joining the centers of each mass.

If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

The center of mass is closer to the larger mass.

In an inelastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?

Kinetic energy is also conserved.

Kinetic energy is gained.

None is correct.

Kinetic energy is lost.

A soldier who fires a bullet from a gun has the tendency to move backwards as the bullet flies forward.

This observation can be explained by:

Newton’s second law.

Conservation of linear momentum.

Newton’s first law of motion.

Conservation of mechanical energy.

Two objects collide and stick together. Kinetic energy:

Is conserved only if the collision is elastic.

Is conserved only if the environment is frictionless.

Is definitely conserved.

Is definitely not conserved.

A 50-kg pitching machine (excluding the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible friction.)

0.14 m/s.

0.28 m/s.

4.4 x 103 m/s.

0.70 m/s.