Give reason
*1- Force is an effect that changes the state of an object.
Because it can change the state of an object from rest to motion or from motion to rest.
*2- You hear a sound when you tap a tunning fork.
Because sound is produced from the vibration of objects.
*3 - When you ride a bicycle, some changes of energy happen.
Because the kinetic energy of the wheel changes by the dynamo into electric energy that changes into light energy through the lamp of the bicycle.
*4- On removing a nail from a wooden plate, the nail becomes warm.
Due to the change of kinetic energy into heat energy.
*5-. It is preferred to use the natural gas to coal.
Because it causes less pollution for the environment than coal.
*6- The government gives attention to use natural gas instead of gasoline in means of transport.
Because it causes less pollution for the environment
*7 - The attraction of a rubbed balloon to a wall.
Because during rubbing the balloon, electric charges are formed on its surface causing the attraction to the wall.
*8- Battery is a main part in the electric circuit.
Because it is the source of the electric current.
*9- Don’t use the electric current of home when you perform an activity.
Because the electric current of homes has high power that may cause death
*10- Breathing through nose is preferable to that through mouth.
Because nose is lined with Hairs and mucus layer to filter the air from dust: and Blood capillaries to warm the air
*11-. The exhaled air differs from the inhaled air
Because the exhaled air contains carbon dioxide gas and water vapour
