FAQ's

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Frequently Asked Questions

1

What is force? Write down its SI unit.

The push or pull on an object which causes it to change its velocity, state of rest or motion is called force. The force can also speed up, slow down, turn and stop the object. It has a magnitude and a direction. The SI unit of force is Newton (N).

2 Define speed and write down its formula with SI unit.

The distance covered in unit time is called speed. Formula: 𝑆𝑝𝑒𝑒𝑑 =𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒/𝑇𝑖𝑚𝑒 The SI unit of speed is meter per second (m/s) or kilometer per hour (km/h).

3 Define the following terms.  Applied Force  Friction  Gravitational Force  Magnetic Force

 Applied Force An applied force is a force that is applied to an object by a person or another object.  Friction Friction is the force that resists motion when the surface of one object comes in contact with the surface of another.  Gravitational Force Every object in this universe attracts every other object with a force called gravitational force.  Magnetic Force Magnetic force is the force exerted by magnets when they attract or repel each other.

4 Differentiate between balanced and unbalanced forces.

Balanced Forces Balanced forces are those that are opposite in direction and equal in size. Unbalanced Forces Unbalanced forces means that the force applied in one direction is greater than the force applied in the opposite direction.

5 What do you know about distance-time graphs?

A distance-time graph is a graphical representation of how far a body has traveled in a specified amount of time. It is used to depict the relationship between distance and time. a) Distance is plotted on the Y-axis. b) Time is plotted on the X-axis.