Center of Mass and Momentum Concepts

How did Isaac Newton originally describe the net force on an object?

• The net force is equal to the object's mass times its acceleration.

• The net force is equal to the instantaneous change in the object's mass times velocity over time.

• The net force is equal to the object's momentum.

• The net force is equal to the object's impulse.

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What is the technical definition of momentum?

• An object's tendency to remain in motion.

• An object's mass multiplied by its velocity.

• The net force on an object over time.

• The change in an object's kinetic energy.

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In physics, what does impulse represent?

• An object's tendency to remain in motion.

• The net force on an object.

• The change in an object's momentum.

• The mass of an object multiplied by its acceleration.

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What distinguishes an elastic collision from an inelastic collision?

• In elastic collisions, momentum is conserved, while in inelastic collisions, it is not.

• In elastic collisions, kinetic energy is conserved, while in inelastic collisions, it is not.

• Elastic collisions involve objects bouncing off each other, while inelastic collisions involve objects sticking together.

• Elastic collisions occur in real life, while inelastic collisions are theoretical.

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NGSS.HS-PS2-2

In a head-on elastic collision between two objects of equal mass, if one object comes to a complete stop after the collision, what happens to the other object?

• It moves in the opposite direction with half the initial velocity.

• It moves in the same direction with half the initial velocity.

• It moves in the opposite direction with the same initial velocity.

• It moves in the same direction with the same initial velocity.

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NGSS.HS-PS2-2

Which statement accurately describes a perfectly inelastic collision?

• Both kinetic energy and momentum are conserved.

• Kinetic energy is conserved, but momentum is not.

• Objects stick together after the collision, and kinetic energy is lost.

• Objects bounce off each other, and momentum is lost.

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NGSS.HS-PS2-2

What does the center of mass of a system represent?

• The point where all the kinetic energy is concentrated.

• The average position of all the mass in the system.

• The point where the system's potential energy is highest.

• The geometric center of the object, regardless of mass distribution.

Consider a 3-meter massless stick with a 2 kg ball attached to one end and a 4 kg ball attached to the other end. Where is the center of mass located relative to the 2 kg ball?

• At 1 meter from the 2 kg ball.

• At 1.5 meters from the 2 kg ball.

• At 2 meters from the 2 kg ball.

• At 2.5 meters from the 2 kg ball.