Check for Understanding on Work, Power, Energy

Front

What is the formula for calculating power?

Back

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

Front

Define work in physics.

Back

Work is done when a force causes an object to move in the direction of the force. It is calculated as Work (W) = Force (F) x Distance (d) x cos(θ).

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is equivalent to one Joule per second.

Front

What is gravitational potential energy (GPE)?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, calculated as GPE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is kinetic energy (KE)?

Back

Kinetic energy is the energy of an object in motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

How does mass affect work done when lifting an object?

Back

The work done is directly proportional to the mass of the object being lifted; heavier objects require more work to lift the same height.

Front

What happens to kinetic energy when an object comes to a stop?

Back

When an object comes to a stop, its kinetic energy is converted to other forms of energy, such as thermal energy due to friction.

Front

Explain the relationship between work and energy.

Back

Work is a transfer of energy; when work is done on an object, energy is transferred to that object, increasing its energy.

Front

What is the principle of conservation of energy?

Back

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

Calculate the work done when lifting a 10 kg box to a height of 2 m.

Back

Work = mgh = 10 kg * 9.8 m/s² * 2 m = 196 J.