Energy Work and Power Flashcard

Front

What is power in physics?

Back

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

Front

How do you calculate power?

Back

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

Front

What is the unit of work?

Back

The unit of work is the Joule (J).

Front

How is energy defined in physics?

Back

Energy is the capacity to do work, measured in Joules (J).

Front

What is kinetic energy?

Back

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

Front

What is the formula for calculating kinetic energy?

Back

KE = 1/2 mv².

Front

What is elastic potential energy?

Back

Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing.

Front

How do you calculate elastic potential energy?

Back

Elastic potential energy (EPE) = 1/2 kx², where k is the spring constant and x is the displacement from the equilibrium position.

Front

What is the spring constant?

Back

The spring constant (k) is a measure of a spring's stiffness, measured in Newtons per meter (N/m).

Front

If a 100 watt bulb runs for 7.5 seconds, how much energy does it use?

Back

Energy used = Power x Time = 100 W x 7.5 s = 750 J.