Notes for Science SA1

Dear all,

Here is the recap of the pointers for Science tomorrow:

Please go through what you have learnt plus your past year topics. Below are just some important pointers for you to take note of too.

• Examples of friction
• Concepts of friction (Especially when two objects collide together)
• Direction of friction and gravity. Friction acts in the opposite direction of moving objects where else gravity acts downwards. 
• Elastic spring force
• Hardness and Strength. Hardness is the ability to withstand scratches. Strength is the ability to withstand weight without breaking. 
• When melting, the temperature remains at 0 degrees celcius until melting is completed.
• Light is reflected from the object into our eyes. Take note of the arrows in a periscope. 
• When we move upwards, there is decrease in kinetic energy and increase in gravitational potential energy. 
• When we move downwards, there is an increase in kinetic energy and decrease in gravitational potential energy.
• Seeds need warmth for germination.
• Dead matter decompose and provide nutrients for soil. Decaying / decomposition takes in oxygen and gives out carbon dioxide. 
• Habitats of Dugong is in the ocean/sea. 
• Take note of how many food chains there are in a food web.
• Trace the food producer first and where it ends up at to calculate the number of food chains. Start with producer and end with the predator only.
• Take note of the food pyramid. Producers are the most at the start!
• Adaptations for breathing in water. The different breathing parts (Refer to textbook and workbook plus practice papers and topical worksheets)
• Parts of a flower like stigma and anther. Pollination and fertilisation. 
• Parts of the crab and penguin. Penguin has flippers to move in water but its beaks cannot tear flesh of prey. Instead, it helps pick up prey to swallow whole. Crabs have 6 middle legs for walking and two bottom legs for swimming. It has a pair of pincers to grab and grip its prey. 
• Friction over different surfaces. The more force there is, the more friction it has to overcome. 
• Air occupies space. 
• Towel must be absorbent and retain water. Does not allow water to pass through it easily. That makes a good towel. 
• When towel is heavier, it has more water. 
• More humidity slows down rate of evaporation. 
• Animals move in packs to hunt. It is a behavioural adaptation. Makes it difficult to attack them while they are in packs. 
• Deoxygenated blood = blood rich in carbon dioxide
• Oxygenated blood = blood rich in oxygen

Read through your textbook, workbook, topical worksheets and practice papers please!

ALL THE BEST! Last minute crash course revision will be held tomorrow morning from 6.50am - 7.10am in the classroom.

Thank you,

Sincerely,

Mr Nelson Ong