Momentum and Energy Conservation Quiz

Which of the following scenarios best illustrates the principle of conservation of momentum?

• A car accelerating on a highway.

• Two ice skaters pushing off each other and moving in opposite directions.

• A ball rolling down a hill.

• A pendulum swinging back and forth.

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NGSS.HS-PS2-2

A 5 kg object moving at 10 m/s collides with a stationary 5 kg object. If the collision is perfectly elastic, what is the velocity of the second object after the collision?

• 0 m/s

• 5 m/s

• 10 m/s

• 15 m/s

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NGSS.HS-PS2-2

Which of the following is an example of a closed system?

• A car engine.

• A sealed thermos bottle.

• A river.

• An open jar.

In a closed system, how does the total energy change over time?

• It increases.

• It decreases.

• It remains constant.

• It fluctuates randomly.

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NGSS.HS-PS3-1

NGSS.HS-PS3-2

Calculate the work done when a force of 20 N moves an object 3 meters in the direction of the force.

• 20 J

• 40 J

• 60 J

• 80 J

Which of the following best describes the relationship between impulse and Newton's 3rd law?

• Impulse is the change in momentum, while Newton's 3rd law states that for every action, there is an equal and opposite reaction.

• Impulse is the force applied over time, and Newton's 3rd law states that forces are unidirectional.

• Impulse is the product of mass and velocity, and Newton's 3rd law states that objects in motion stay in motion.

• Impulse is the energy transferred, and Newton's 3rd law states that energy is conserved.

A 2 kg object is moving with a velocity of 3 m/s. Calculate its kinetic energy.

• 3 J

• 6 J

• 9 J

• 18 J

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NGSS.HS-PS3-2

Which of the following investigations would best demonstrate the conservation of energy in a closed system?

• Measuring the temperature change in an open pot of boiling water.

• Observing the motion of a pendulum in a vacuum chamber.

• Calculating the speed of a car on a highway.

• Analyzing the energy transfer in a solar panel.

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NGSS.HS-PS3-4

What is the primary difference between open and closed systems?

• Open systems exchange energy with their surroundings, while closed systems do not.

• Open systems have a fixed volume, while closed systems do not.

• Open systems are isolated, while closed systems are not.

• Open systems are always in equilibrium, while closed systems are not.

If a force of 10 N is applied to an object for 5 seconds, what is the impulse experienced by the object?

• 2 Ns

• 5 Ns

• 10 Ns

• 50 Ns