2.  A force can put an object into motion, stop
an object or change the way that it moves. A
force can also deform or break an object.

3.  Contact forces Non-contact forces

4.  Wheelbarrows inclined planes
Pulleys

5.  class1 levers class 2 levers
 class 3 levers

6.  A complex machine is a combination of two
or more simple machines.

7.  The art of applying scientific knowledge to
solve practical problems.