CG Board Class 6 Science Motion, Force And Pressure Notes / Textbook Exercises / Question Answers as well as Additional Question Answers from the Chapter.
Objects and Motion
Objects around us can be in a state of rest or motion.
Motion can be straight-line, circular, rotational, oscillatory, periodic, or non-periodic.
Types of Motion
Straight-line motion can be uniform or non-uniform.
Speed is the distance traversed by a body or object in unit time, with the SI unit being meter/second.
Force
Force is a push or pull applied to any body.
A force can change the speed, shape, or size of an object.
The SI unit of force is Newton (N).
Force can be classified into mechanical, gravitational, magnetic, electrostatic, and frictional force.
Pressure
Pressure is the force exerted on a unit area.
Fluids (liquids and gases) exert pressure.
The SI unit of pressure is Newton/meter² (Pascal – Pa).
Atmospheric pressure is about 100 kilopascals (kPa).
Atmospheric Pressure
The amount of air decreases as you go upwards in the atmosphere, causing atmospheric pressure to decrease.
High altitudes can lead to discomfort and even nosebleeds due to changes in atmospheric pressure.
Choose the correct alternative —
1. A motion which repeats itself in a fixed interval of time is known as
a. non-periodic motion
b. periodic motion
c. rotational motion
d. straight-line motion
2. When a force is applied opposite to the direction of motion of a moving object,a.its speed
a. increases
b. increase or decrease
c. decreases
d. no change
3.The force of attraction between any two bodies is known as –
a. electrostatic force
b. magnetic force
c. gravitational force
d. mechanical force
4. Which force is responsible for walking –
a. magnetic force
b. Electric force
c. mechanical force
d. frictional force
5. At what level would a swimmer experience more pressure
a. three-fourth depth
b. half depth
c. on the lower surface
d. on the upper surface.
Match the following
| Column A | Column B |
| Force | Newton |
| Pressure | Pascal |
| Speed | Metre/Second |
| A Flying Bird | Body in Motion |
Fill up the blanks with appropriate words/phrases –
- Force is either push or pull.
- Newton/metre² is the unit of pressure.
- The earth pulls a body thrown from a height towards itself due to the force of gravitation.
- Frictional force is responsible for wearing out of cycle tires.
- 1 atmospheric pressure = 100 kilopascal.
