Energy Sources and Simple Machines

The video tutorial covers the concepts of force, work, and energy for class four science. It includes multiple choice questions, fill in the blanks, and one-word answers to test understanding. Detailed explanations and examples are provided for work, levers, and simple machines. The video also discusses the importance of renewable energy sources like solar and wind energy, highlighting their benefits for the environment.

What force causes a ripe mango to fall to the ground?

• Electricity

• Gravity

• Magnetism

• Friction

Which of these forces can stop a moving object?

• Inertia

• Magnetism

• Friction

• Gravity

What is an example of work being done?

• Pushing a lawn mower

• Standing still

• Holding a book

• Sitting on a chair

Which simple machine can be used to open a can?

• Pulley

• Lever

• Wheel and axle

• Inclined plane

What is the main source of energy on Earth?

• Wind

• Water

• Sun

• Coal

What is the energy of moving water called?

• Hydro energy

• Solar energy

• Thermal energy

• Wind energy

Which of the following is an example of a lever?

• Ramp

• Seesaw

• Jar lid

• Bicycle wheel

What is the ability to do work called?

• Force

• Energy

• Power

• Motion

How is solar energy captured?

• Solar panels

• Wind turbines

• Hydroelectric dams

• Geothermal plants

What is a benefit of wind energy?

• It is expensive

• It is renewable

• It causes pollution

• It is non-renewable