Questions and Answers
What is the unit of energy?
Which of the following is a form of kinetic energy?
What is the formula for power?
Which device converts electrical energy into light energy?
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What is the unit of power?
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Which of the following is a form of potential energy?
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What is the efficiency of a machine?
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Which machine converts mechanical energy into electrical energy?
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What is the formula for kinetic energy?
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Which of the following is a form of renewable energy?
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What is the force that opposes motion between two surfaces in contact?
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Which type of friction occurs when an object is stationary?
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What is the coefficient of friction?
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Which surface has the highest frictional force?
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What is the force that opposes the motion of an object?
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Which type of friction occurs when an object is rolling?
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What is the formula for frictional force?
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Which factor affects the frictional force?
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What is the purpose of lubricants?
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Which type of friction occurs when an object is moving?
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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.