Energy Conversion and Types

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Questions and Answers

What is the unit of energy?

Joule (J) (correct)

Calorie (cal)

Watt (W)

Kilowatt (kW)

Which of the following is a form of kinetic energy?

Thermal energy

Chemical energy

Electrical energy

Mechanical energy (correct)

What is the formula for power?

P = E x t

P = F x d

P = m x v

P = E / t (correct)

Which device converts electrical energy into light energy?

Light bulb Signup and view all the answers

What is the unit of power?

Watt (W) Signup and view all the answers

Which of the following is a form of potential energy?

Gravitational energy Signup and view all the answers

What is the efficiency of a machine?

Output energy / Input energy Signup and view all the answers

Which machine converts mechanical energy into electrical energy?

Generator Signup and view all the answers

What is the formula for kinetic energy?

K = 1/2 mv^2 Signup and view all the answers

Which of the following is a form of renewable energy?

Solar energy Signup and view all the answers

What is the force that opposes motion between two surfaces in contact?

Friction Signup and view all the answers

Which type of friction occurs when an object is stationary?

Static friction Signup and view all the answers

What is the coefficient of friction?

The ratio of normal force to frictional force Signup and view all the answers

Which surface has the highest frictional force?

Rough surface Signup and view all the answers

What is the force that opposes the motion of an object?

Friction Signup and view all the answers

Which type of friction occurs when an object is rolling?

Rolling friction Signup and view all the answers

What is the formula for frictional force?

F = μN Signup and view all the answers

Which factor affects the frictional force?

All of the above Signup and view all the answers

What is the purpose of lubricants?

To decrease friction Signup and view all the answers

Which type of friction occurs when an object is moving?

Kinetic friction Signup and view all the answers

Study Notes

Energy

The unit of energy is Joule (J).
Mechanical energy is a form of kinetic energy.
Power is calculated using the formula P = E / t.
The unit of power is Watt (W).

Energy Conversions

A light bulb converts electrical energy into light energy.
A generator converts mechanical energy into electrical energy.

Types of Energy

Thermal energy is a form of kinetic energy.
Electrical energy is a form of energy.
Chemical energy is a form of energy.
Gravitational energy is a form of potential energy.

Efficiency

The efficiency of a machine is calculated using the formula Output energy / Input energy.

Kinetic Energy

The formula for kinetic energy is K = 1/2 mv^2.

Renewable Energy

Solar energy is a form of renewable energy.

Friction

Friction is the force that opposes motion between two surfaces in contact.
Static friction occurs when an object is stationary.
Rolling friction occurs when an object is rolling.
The coefficient of friction is the ratio of frictional force to normal force.
The frictional force is calculated using the formula F = μN.
The frictional force is affected by normal force, surface area, and temperature.
Lubricants decrease friction.

Forces

Friction is the force that opposes the motion of an object, distinct from thrust, drag, and gravity.

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Description

Learn about the basics of energy, including units, conversions, and types of energy. Understand the relationships between mechanical, thermal, electrical, and chemical energy.