Energy, Work, & Power Flashcard

Front

What is the formula for calculating work?

Back

Work (W) = Power (P) × Time (t)

Front

Define power in the context of physics.

Back

Power is the rate at which work is done or energy is transferred, measured in watts (W).

Front

What is kinetic energy?

Back

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

Front

How do you calculate kinetic energy?

Back

Kinetic energy (KE) = 1/2 × mass (m) × velocity (v)².

Front

What two factors affect an object's kinetic energy?

Back

Mass and speed.

Front

If a machine does 1,224 J of work in 18 seconds, what is its power output?

Back

Power = Work / Time = 1,224 J / 18 s = 68 W.

Front

What is the unit of power?

Back

The unit of power is the watt (W), which is equivalent to one joule per second (J/s).

Front

What is the relationship between work, power, and time?

Back

Power is the amount of work done per unit of time.

Front

If an object has a mass of 2.84 kg and is moving at 9 m/s, what is its kinetic energy?

Back

Kinetic energy = 1/2 × 2.84 kg × (9 m/s)² = 115 J.

Front

What is the significance of the formula KE = 1/2 mv²?

Back

This formula shows how both mass and velocity contribute to the kinetic energy of an object.