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Classical Mechanics

Potential Energy

Concept Quizzes

Potential energy vs. work
Conservative vs. non-conservative forces
Potential energy due to gravity
Potential energy of springs
Potential Energy - problem solving

Challenge Quizzes

Potential Energy: Level 2-3 Challenges

Conservative vs. non-conservative forces

As shown in the figure above, a spring is attached horizontally to a vertical wall, and an object lies on a frictionless horizontal floor, attached to the other end of the spring. A man pulls the object so that the spring doubles in length, and then let the object go. Which of the following statements is/are true concerning this situation?

I. The force exerted by the spring on the object is a conservative force.

II. The potential energy in the spring is constant.

III. If no other force is applied after the man lets it go, the object will keep on moving back and forth.

I only II only I and III only II and III only

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by Brilliant Staff

A conservative force is $\text{\_\_\_\_\_\_\_\_\_}.$

a force that conserves the total energy of an object a force that conserves the form of an object a force that conserves the kinetic energy of an object a force that conserves the mechanical energy of an object

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by Brilliant Staff

A ball $A$ of mass $2\text{ kg}$ moves in a straight line at $5\text{ m/s}$ on a frictionless horizontal floor. It collides with another $2\text{ kg}$ ball $B$ that is at rest. After the collision, ball $A$ comes to a complete stop, and ball $B$ starts to move at a speed of $5\text{ m/s}.$ Which of the following is NOT correct concerning this situation?

The total linear momentum is conserved. The force exerted on

B

A

is a conservative force. The collision is perfectly elastic. The force exerted on

A

B

is a non-conservative force.

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by Brilliant Staff

Which of the following choices correctly fills the blanks of the sentence below, in the right order?

"Gravity is a $\text{\_\_\_\_\_\_\_\_\_}$ force and friction is a $\text{\_\_\_\_\_\_\_\_\_}$ force."

conservative, conservative conservative, non-conservative non-conservative, conservative non-conservative, non-conservative

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by Brilliant Staff

Consider a car is traveling down a hill. Which of the following is a conservative force that acts on the car?

The gravitational force that pulls the car down the hill. The force generated by the engine of the car. The air resistance that acts on the car. The kinetic friction between the wheels of the car and the road.

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by Brilliant Staff