Physics Quiz on Momentum, Energy, Work, Power, Pressure, and Kinetic Molecular Model

What is the formula for momentum?

• mass × velocity
• force × time
• energy × distance
• pressure × volume

Two objects with different masses collide elastically. Which quantities are conserved in this collision?

• Only momentum
• Only kinetic energy
• Both momentum and kinetic energy
• Neither momentum nor kinetic energy

A 2 kg object moving at 3 m/s collides with a stationary 1 kg object. If the 2 kg object continues at 1 m/s in the same direction after collision, what must be the velocity of the 1 kg object to conserve momentum?

• 4 m/s
• 5 m/s
• 6 m/s
• 7 m/s

Why does a liquid take the shape of its container while a solid maintains its shape?

• Liquids have no intermolecular forces
• Liquid molecules can move around each other while solid molecules are fixed in position
• Liquid molecules are further apart than solid molecules
• Liquids have stronger intermolecular forces than solids

Which statement best explains why gases can be compressed but liquids cannot?

• Gases have no molecules
• Gas molecules are far apart with space between them
• Gas molecules are closer together than liquid molecules
• Gases have stronger intermolecular forces

A student lifts a 10 N book 2 meters vertically. How much work is done against gravity?

• 5 Joules
• 10 Joules
• 20 Joules
• 40 Joules

If a machine requires 1000 Joules of input energy and produces 800 Joules of useful work, what is its efficiency?

• 80%
• 20%
• 125%
• 8%

What happens to the pressure in a liquid as depth increases?

• Decreases linearly
• Increases linearly
• Stays constant
• Decreases exponentially

Which energy transformation occurs when a stretched rubber band is released?

• Kinetic to elastic potential
• Elastic potential to kinetic
• Gravitational potential to kinetic
• Chemical to kinetic

Why does pressure in a fluid act equally in all directions?

• Because fluid molecules are stationary
• Because fluid molecules can move freely and transmit force equally
• Because fluids have no mass
• Because fluids have no volume