Answer the following questions: 1. What do you understand by frictional force? Give example. 2. List the different types of energy.
Answer (1)
What do you understand by frictional force? Give an example.
Frictional force is a type of force that opposes the motion of an object. It occurs when two surfaces come into contact and move (or try to move) against each other. Frictional force acts in the opposite direction to the direction of movement. This force can help objects stop moving and also makes certain tasks possible, like walking.
Example: When you try to slide a book across a table, the book stops after a short distance. The force that stops it is called frictional force. This is because the surface of the book and the table have irregularities that interlock, thus creating resistance to the book's movement.
List the different types of energy.
There are several types of energy, and they can be categorized in many ways. Here are some common types of energy:
Kinetic Energy: Energy possessed by an object due to its motion. For example, a moving car has kinetic energy.
Potential Energy: Energy stored in an object due to its position or state. For example, a rock at the top of a hill has potential energy.
Thermal Energy: Also known as heat energy, it is the energy possessed by an object due to the motion of its particles. The faster the particles move, the more thermal energy they have.
Chemical Energy: Energy stored in the bonds of chemical compounds, like in food and fuels. When the bonds are broken, energy is released.
Electrical Energy: Energy caused by the movement of electrons. It powers our homes and gadgets.
Nuclear Energy: Energy stored in the nucleus of an atom. It can be released through nuclear reactions.
Light (Radiant) Energy: Energy transmitted in the form of electromagnetic waves. An example is sunlight.
