TYPES OF FORCES
Contact forces
Look at the pictures and say either push and pull belong to each picture.
Now that you have watched the video about Friction answer to the following questions:
What is friction? Examples from the video?
What materials cause a higher friction? And lower?
Non-Contact Forces
Answer to the following questions about Gravity:
What is gravity?
How does the Earth attract objects to its centre? What are the molecules in the core of the Earth made of?
How is it that apples don’t fall from the trees until they are ripe and not before?
Who discovered gravity? How?
MACHINES
Simple Machines
