Chapter 4 Exam "Work and Energy"

Front

What is Mechanical Advantage?

Back

Mechanical Advantage is the ratio of the output force produced by a machine to the input force applied to it. It indicates how much a machine multiplies force.

Front

How is Mechanical Advantage calculated in a pulley system?

Back

Mechanical Advantage = Output Force / Input Force.

Front

What happens to Gravitational Potential Energy when an object is moved to a lower height?

Back

Gravitational Potential Energy decreases as the height of the object decreases.

Front

What is the formula for Gravitational Potential Energy?

Back

Gravitational Potential Energy (GPE) = mass (m) × gravitational acceleration (g) × height (h).

Front

Describe the energy conversion in a car's engine.

Back

In a car's engine, energy conversion occurs from Chemical energy (fuel) to Thermal energy (heat) to Mechanical energy (movement).

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

What is the formula for Elastic Potential Energy?

Back

Elastic Potential Energy = 1/2 × k × x², where k is the spring constant and x is the displacement from the equilibrium position.

Front

Define Power in the context of energy transformation.

Back

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

Front

What is the relationship between Power, Work, and Time?

Back

Power = Work / Time.

Front

What is the unit of Power?

Back

The unit of Power is the watt (W), which is equivalent to one joule per second.