- Gravity is a force that pulls objects downwards towards the centre of the earth.
- When objects are thrown, they are released from a high point.
- While standing, pick a book and hold it high. Then release it.
As expected, the book will fall.
- When objects are thrown, they are released from a high point.
Demonstrating Gravity
- Although we cannot see gravity, we can demonstrate its existence.- While standing, pick a book and hold it high. Then release it.
As expected, the book will fall.
Demonstrating Gravity
Energy: Sound
- Sound is produced when objects vibrate.
- The object can be made to vibrate by:
- Soft sound is low in volume.
- The soft sound is produced when an object is hit slightly.
- The object can be made to vibrate by:
- Blowing
- Plucking
- Hitting
A Bell - It produces sound when shaken
Classifying sound
- Loud sound is produced when objects are hit hard with high intensity.- Soft sound is low in volume.
- The soft sound is produced when an object is hit slightly.
Effects of sound pollution
- The following are some of the effects of sound pollution:- Causes irritability.
- Affects the hearing as it can affect the ear drum.
- Makes one feel uncomfortable.