Work and Energy Concepts

Which activity would be considered as doing 'scientific work'?

All strenuous activities require energy and are considered work according to scientific definitions.

What is the primary source of energy for living organisms?

Animals perform various activities such as jumping and running to find _____ or avoid dangers.

Match the following terms with their definitions:

What is one reason some engines require fuel like petrol and diesel?

Activities like playing in a field or watching a movie are always considered work.

According to scientific conception, what must happen for work to be done on an object?

In day-to-day life, we define work as any useful physical or mental labor, whereas in science, work is defined as __________.

Match the following scenarios with the corresponding concept of work:

Work and Energy

Work is different in everyday language and science.
In science, work is done when a force causes an object to move in the direction of the force.
Work is calculated as force multiplied by displacement (W = Fs).
The unit of work is the joule (J) or Newton-meter (N⋅m).
If force and displacement are not in the same direction, work is calculated as W = Fs cos θ, where θ is the angle between them.
Positive work is done when force and displacement are in the same direction; negative work is done when the force is opposite to the displacement.
No work is done if there is no displacement.

Energy

Energy is the capacity to do work.
Energy has the same unit as work, the joule (J).
Various forms of energy exist: mechanical, heat, chemical, electrical and light.
Energy can be converted from one form to another, but it is never created or destroyed (law of conservation of energy).

Kinetic Energy

Kinetic energy is the energy of motion.
Kinetic energy is calculated as 1/2 * m * v^2, where m is mass and v is velocity.

Potential Energy

Potential energy is the energy an object has due to its position or configuration.
Gravitational potential energy is the energy an object has due to its height.
It's calculated by mgh, where m is mass, g is acceleration due to gravity and h is height.

Power

Power is the rate at which work is done or energy is transferred.
It is calculated as work/time or energy/time.
The unit of power is the watt (W), equal to 1 joule per second (J/s).
Kilowatt-hour (kWh) is a larger unit of energy. 1kWh = 3.6 x 10⁶ J.

Explore the fundamental concepts of work and energy in physics through this quiz. Understand the definitions, calculations, and different forms of energy, including kinetic energy and the law of conservation of energy. Test your knowledge on how energy is related to work and its various applications.