Experiment: Activity 2 - Friction and types of surface

Homework

• Complete page pg 6 & 7, all questions. We shall go through the answers in class tomorrow. 
• Remember to bring back your activity book tomorrow.

Important things to take note in this experiment

In answering open-ended questions, when asked to "Explain your answer.", always remember to state the cause (scientific reason) and effect.

• E.g. Which of the above liquid allowed the metal ball to fall through it more easily? Explain your answer.
• Liquid X. 
• Cause => The ball experience lesser friction between its surface and the liquid.
• Effect => Ball falls through Liquid X faster than Liquid Y.

Friction always exist between 2 surface. Always remember to state the it is between two surfaces (identify the surfaces).

Misconception: Objects have friction on their surfaces. Friction is a property of an object. (e.g. Wood is rough so it has a lot of friction. Fabric is smooth so it has no friction)

• Objects do not have friction on their surface.
• Friction is a force that exists between two surfaces that are in contact with each other. 
• Frictional force acts on both rough and smooth surface.