Law of Conservation of Energy Calculations Flashcard

Front

What is the law of conservation of mechanical energy?

Back

Total mechanical energy remains constant in a closed system if only conservative forces are acting on the system.

Front

What is the formula for calculating kinetic energy?

Back

KE = 0.5 * m * v^2

Front

If an object has a kinetic energy of 200 J and a mass of 50 kg, what is its velocity?

Back

2.8 m/s

Front

A 3 kg object is lifted to a height of 15 meters at 2 m/s. What is its potential energy?

Back

450 J

Front

If an object has a kinetic energy of 300 J and a mass of 20 kg, what is its speed?

Back

5.5 m/s

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration, commonly calculated as PE = m * g * h.

Front

What does 'conservative force' mean?

Back

A conservative force is a force that does work on an object in such a way that the total mechanical energy of the system remains constant.

Front

What is the gravitational potential energy of an object at a height of 10 m with a mass of 5 kg?

Back

PE = m * g * h = 5 kg * 9.81 m/s^2 * 10 m = 490.5 J.

Front

How does friction affect mechanical energy?

Back

Friction is a non-conservative force that converts mechanical energy into thermal energy, causing a decrease in total mechanical energy.

Front

What is the relationship between kinetic energy and velocity?

Back

Kinetic energy is proportional to the square of the velocity; doubling the velocity increases kinetic energy by a factor of four.