Understanding Work, Energy, and Power in Physics

What does 'work' specifically refer to in physics?

• Using tools in a workshop

• Studying for exams

• Force applied over a distance

• Effort applied in an office job

What unit is commonly used to express work in physics?

• Newton-meters

• Joules

• Watts

• Kilograms per meter squared

How is work calculated when the force is not aligned with the direction of movement?

• Force alone is sufficient

• Force divided by the cosine of the angle

• Force multiplied by the cosine of the angle to the direction of movement

• Force multiplied by distance

What is the significance of the angle in calculating work when force is applied at an angle?

• It is used to calculate the component of force that does work

• It determines the direction of motion

• It is irrelevant to the calculation of work

• It indicates the type of energy involved

What is kinetic energy?

• Potential energy due to height

• Energy of motion

• Energy due to position

• Energy stored in springs

What does potential energy depend on?

• Speed of the object

• Mass and height of the object

• Color of the object

• Temperature of the environment

Which type of energy is described by the equation half times mass times velocity squared?

• Kinetic energy

• Chemical energy

• Potential energy

• Thermal energy

What defines a non-conservative system?

• A system that only has kinetic energy

• A system where total energy is not constant due to external work like friction

• A system that conserves all energy

• A system in perpetual motion

What happens to the potential energy of a pendulum at the top of its swing?

• It is at its maximum

• It is zero

• It disappears

• It converts entirely to kinetic energy

How is average power calculated?

• Force divided by distance

• Velocity multiplied by time

• Work divided by time

• Energy divided by force