Conservative and Nonconservative Forces

What is the work done by gravity on an object moving vertically down a distance h?

• Acceleration due to gravity times height

• Mass times acceleration due to gravity times height

• Mass times height

• Zero

What is the work done by gravity on an object sliding down an incline of angle alpha?

• Mass times height

• Acceleration due to gravity times height

• Zero

• Mass times acceleration due to gravity times height

What is the relationship between sine and cosine in the context of an incline?

• Sine alpha equals cosine of 90 minus alpha

• Sine alpha equals cosine alpha

• Sine alpha equals cosine of alpha plus 90

• Sine alpha equals cosine of alpha minus 90

How does the work done by gravity relate to gravitational potential energy?

• It is the negative of the change in potential energy

• It is equal to the change in potential energy

• It is twice the change in potential energy

• It is half the change in potential energy

What is the angle between the force of kinetic friction and displacement when an object slides down an incline?

• 0 degrees

• 90 degrees

• 45 degrees

• 180 degrees

Which force is considered a non-conservative force?

• Gravitational force

• Spring force

• Frictional force

• Magnetic force

Which of the following is a property of conservative forces?

• Work done is always negative

• Work done is always positive

• Work done is zero over a closed path

• Work done is path-dependent

What is the work done by the force of friction on an object moving in a half-circle path?

• Negative pi over 2 times coefficient of kinetic friction times mass times acceleration due to gravity times distance

• Zero

• Positive pi over 2 times coefficient of kinetic friction times mass times acceleration due to gravity times distance

• Negative coefficient of kinetic friction times mass times acceleration due to gravity times distance

What happens to the work done by friction when an object moves through a closed path?

• It equals zero

• It is positive

• It is negative

• It does not equal zero

What is a basic definition of conservative forces?

• Forces that do not conserve mechanical energy

• Forces that always do negative work

• Forces that can return kinetic energy back to the system

• Forces that always do positive work