work energy theoreme

What is the relationship between net work and kinetic energy according to the Work-Energy Theorem?

• Net work equals the change in mechanical energy.

• Net work equals the change in kinetic energy.

• Work done by friction equals the change in mechanical energy.

• Work done by friction equals the change in kinetic energy.

If a block starts from rest and comes to rest at its maximum height, what is the net change in its kinetic energy?

• Positive

• Negative

• Zero

• Cannot be determined without knowing the mass.

When a block slides on a horizontal surface, what is the work done by the normal force and the force of gravity on the block?

• Positive

• Negative

• Zero

• Depends on the coefficient of friction.

What is the relationship between the work done by a spring on a block and the change in the spring's elastic potential energy?

• Work done by the spring = ΔPE_e

• Work done by the spring = -ΔPE_e

• Work done by the spring = PE_e_initial

• Work done by the spring = PE_e_final

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What is the magnitude of the normal force acting on a block on an incline if the block is not accelerating perpendicular to the incline?

• mg

• mg sin(θ)

• mg cos(θ)

• 0

When the net work done on a system is zero, what does this imply about the change in kinetic energy?

• The change in kinetic energy is positive.

• The change in kinetic energy is negative.

• The change in kinetic energy is zero.

• The change in kinetic energy is equal to the work done by friction.

What type of energy conversion is indicated by a negative work done by the force of gravity on a block moving up an incline?

• Elastic potential energy to kinetic energy.

• Kinetic energy to heat and sound energy.

• Kinetic energy to gravitational potential energy.

• Gravitational potential energy to kinetic energy.

If the initial elastic potential energy of a system is 0.007168 J, and the work done by kinetic friction is -0.0028062 J, what percentage of the initial elastic potential energy was dissipated as heat and sound energy?

• Approximately 39%

• Approximately 61%

• Approximately 100%

• Approximately 0%