_13) Energy, Work, And Power

Front

What is work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied in the direction of the force.

Front

Can work be positive or negative?

Back

Yes, work can be positive, negative, or zero depending on the direction of the force relative to the displacement.

Front

What is the formula for calculating work?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred over time.

Front

What is the formula for calculating power?

Back

Power (P) = Work (W) / Time (t).

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration, commonly gravitational potential energy, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the work-energy principle?

Back

The work-energy principle states that the work done on an object is equal to the change in its kinetic energy.

Front

What is the difference between conservative and non-conservative forces?

Back

Conservative forces (like gravity) do not dissipate energy and have potential energy associated with them, while non-conservative forces (like friction) do dissipate energy.

Front

What is an example of work being done?

Back

Lifting a box is an example of work being done because a force is applied in the direction of the displacement.