Physics Sem 2 Review

What does the law of conservation of momentum state?

• The total momentum of a closed system remains constant unless acted upon by an external force.

• The total energy of a system always increases.

• The total mass of a system is always conserved.

• The total velocity of a system is always constant.

Which of the following best describes the difference between an elastic and an inelastic collision?

• Elastic collisions conserve both momentum and kinetic energy, while inelastic collisions conserve only momentum.

• Elastic collisions do not conserve momentum, while inelastic collisions do.

• Inelastic collisions conserve both momentum and kinetic energy, while elastic collisions conserve only momentum.

• Both types of collisions do not conserve momentum or kinetic energy.

What is the moment of inertia and what does it depend on?

• It is a measure of an object's resistance to changes in its rotation, and it depends on the mass distribution relative to the axis of rotation.

• It is a measure of an object's resistance to changes in its rotation, and it depends on its velocity.

• It is a measure of an object's temperature, and it depends on its heat capacity.

• It is a measure of an object's charge, and it depends on its electric field.

When is angular momentum conserved in a system?

• When no external torque acts on the system.

• When the system is at rest.

• When the system is moving in a straight line.

• When the system is heated.

What happens to the rate of rotation when the moment of inertia increases, assuming angular momentum is conserved?

• The rate of rotation decreases.

• The rate of rotation increases.

• The rate of rotation remains the same.

• The rate of rotation becomes zero.

What is pressure?

• The force applied per unit area

• The amount of mass in a given volume

• The speed of an object in motion

• The energy stored in an object

Which of the following is a correct unit for measuring pressure?

• Newton

• Pascal

• Joule

• Watt

How do you find the pressure at a particular depth in a fluid?

• By dividing the mass by the volume

• By multiplying the density, gravitational acceleration, and depth

• By adding the temperature and volume

• By subtracting the force from the area

A barometer is used to:

• Measure temperature

• Measure atmospheric pressure

• Measure electric current

• Measure speed

A block of wood floats on water. Using Archimedes' Principle, explain why this happens.

• The block is heavier than the water it displaces

• The block is less dense than the water, so the buoyant force equals its weight

• The block is magnetic

• The block is at a higher temperature than the water