E7.2 Mechanical Energy -ssss

What is kinetic energy?

Kinetic energy is the energy that an object possesses due to its motion.

What is potential energy?

Potential energy is the energy associated with the position of an object or the arrangement of a system of objects that exert forces on one another.

What does gravitational potential energy (GPE) depend on?

Gravitational potential energy depends on an object's weight and height.

What formula is used to calculate gravitational potential energy?

The formula for gravitational potential energy is PEg = mgh, where m is mass, g is acceleration due to gravity, and h is height.

What is elastic potential energy?

Elastic potential energy is the ability of an object to do work as a result of being deformed from its original shape.

How does the elastic potential energy change with displacement?

The elastic potential energy is proportional to the square of the displacement of the spring from its equilibrium position.

What factors influence gravitational potential energy?

The gravitational potential energy is influenced by the weight of the object and its height above a reference point.

How is work related to energy in a gravitational field?

The work done against gravity in moving an object a certain distance is equal to the change in its gravitational potential energy.

What are conservative and non-conservative forces?

Conservative forces are those where the work done does not depend on the path taken, while non-conservative forces take energy away from a system and depend on the path taken.

What is the definition of friction?

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another.

What happens to mechanical energy when friction is present?

When friction is present, mechanical energy is converted into thermal energy.

What determines the work done by electrostatic forces?

The work done by electrostatic forces is related to the charge of the particles and their distance from each other.

What does the conservation of mechanical energy state?

The conservation of mechanical energy states that in an isolated system, the total mechanical energy remains constant if only conservative forces are acting.

How do maglev trains work according to magnetic potential energy?

Maglev trains use powerful magnetic fields to provide potential energy that keeps the train hovering and propelling it forward.

In the context of springs, what is the relationship between force and displacement?

The force exerted by a spring is proportional to its displacement from the equilibrium position, according to Hooke's law.

How does the velocity of an object relate to its kinetic energy?

The kinetic energy of an object is proportional to the square of its velocity.

What principle explains why a skidding car transforms kinetic energy to thermal energy?

Friction transforms the car's kinetic energy into thermal energy, increasing the internal energy of the tire and the road.

What is an example of a non-conservative force?

An example of a non-conservative force is friction.

Describe an elastic object and give examples.

Elastic objects can be stretched or compressed and then return to their original shape; examples include springs and rubber bands.

What is the significance of mechanical energy bar charts?

Mechanical energy bar charts illustrate the changes in potential and kinetic energy within a system and how they relate to external work.