forces and pressure
by CHEOW SUE-JANE .

1. what are forces
1.1. its a push or a pull
2. what are the effects of forces
2.1. 1. Change speed(faster slower) 2.change shape 3.change direction 4.stop a moving object 5.start a stationary object
3. how can we measure a force
3.1. Instuments to measure amomt of forcespring balance ,compression balance Unit of force:newton,N
4. important forces
4.1. frictional force
4.1.1. Occur when 2 moving surfaces are in contact . Effects:heat produced ,slow down moving object, causing wear and tear
4.2. magnetic force
4.2.1. Magnetic force Is a force exerted by a magnet on another magnetic materialsteelironnickelcobalt [n s] [n s ]repel [s n] [s n]attract Like poles repel unlike poles attract . Examples of magnetic force-maglev train
4.3. gravatitional force
4.3.1. a force that pulls an object to the earth (gravity) gravititional force =weight mass amount of matter in an object weightamount of force due to the earths gravititional pull Weight =mass gravatitional field strength (g earth =10 ms)