After this lesson, you should be able to:

• Describe a force as a push or a pull or a twist exerted upon an object
• Force is measured in newtons (N)
• List some effects of forces on objects on which they act
• Classify forces into contact and non-contact and give examples
• Distinguish between normal force, force of friction and tension force
• Know that gravitational forces are non-contact forces
• Link balanced and unbalanced forces to the state of motion of an object
• Identify action-reaction pairs of forces
• Draw simple force diagrams