Materials and Magnets Flashcards
M and Ms
State one material one material a walking stick for the elderly could be made of. Explain why.
Plastic/Wood/Metal. It has great strength. strong. The handle must be strong enough to support the weight of the elderly.
Identical blocks, A, B and C, were made of different materials. They were balance over a gap in two tables. Weights of 1 kg were placed on them until they broke. A could hold the smallest number of blocks, followed by B, than C. Which material is the best for making a bookshelf?
Block C. It could hold the biggest number of weights before breaking so it is made of the strongest material. Thus, it is the most suitable to make a book shelf to carry the maximum number of books.
For different material, P Q R S were conducted with two investigations to choose the most suitable material to make a key.
Weights were hung on each material of identical size until it broke.
A strip of each material was clamped to a table. A weight was placed at the same position on each material. The distance that each strip bent after adding the weight was measured as distance d.
R took the greatest mass at which the strip broke, followed by P S Q. P bent the most, followed by S Q R.
Which material is the most suitable to more the key. Explain why.
Material R. The mass at which R broke was the greatest, so material R is the strongest and the key made out of it will be less likely to break when it turns. R bent the least, so it is the least flexible and the key made of it will bend the least when turned.
Kite surfing is a sport that uses a strong wind and a large kit to pull a rider across water. Pat X is the part of the kite that catches the wind. Andrew poured the same volume of water on two materials, A and B. The materials are of the same size and thickness. Some water was collected in the beaker under material a while none was collected under B.
Which material is most suitable to make Part X. Explain why.
State another property the material should have to make it suitable to make Part X. Give a reason why.
Material B. No water was collected in the beaker thus B is waterproof. It will not weigh the kit down when it is wet.
Great strength. It must be able to withstand strong wind
Name 4 example of magnetic materials.
Name two non magnetic metals.
Iron Steel Cobalt Nickel
Copper Gold
Stroking method of magnetism. Define it and explain which poles are which
A Pole of an magnet to stroke a magnetic material in one direction for at least 20 times. The end of the magnet at which the stroking starts is the same pole as the one which stroked it.
A bar magnet was placed on a piece of white paper. Some iron fillings where sprinkled onto the paper. What would you observed about the iron fillings . Explain your observations.
The greatest number of iron fillings were attracted to the poles. The poles of a magnet have the strongest magnetism
A bar magnet was tied to a string then was hung in the air. What can you observe and explain why.
The magnet came to a stop after a while and was resting in the North-South direction.
Freely suspended magnets always rest in the North-South direction.
Magnets A B C D were strung on strings above a tray of iron pins and suspended in the air. Magnet a was 2 cm, B was 5 cm, C and D were 8 cm away from the pins. It was observed that 1 pin was attracted to A, B had 2, C had 2, D had 7. What can be concluded about the magnetic strength of Magnet A and Magnet D. Explain your answer.
Magnet A has the weakest magnetic strength while Magnet D has the strongest magnetic strength.
Magnet A attracted the least number of pins although it is the nearest to the pins while Magnet D attracted the most number of pins although it is the furthest from the pins.
A wooden rod was balanced on a support. Object A was glued to the underside of one side of the rod. A bar magnet with its North pole was put below object A. The side of the rod without object A tilted downwards. What could Block A be. Give a reason for your answer. Suggest one material Object A could be made of.
Object A could be a magnet.
Only magnets can repel each other. The like poles of the magnet and Object A were facing each other, causing Object A to be repelled upwards, thus the other side of the rod moved downwards.
Nickel.
A magnet was held above a paper clip attached to a weight through a string.
What do you observe about the paper clip and explain why.
A steel sheet was placed between the magnet and paper clip.
What do you observe about the paper clip now, and explain why.
The paper clip was suspended in the air. The magnet attracts the paper clip and holds it in mid-air.
The paper clip dropped onto the table and was no longer suspended when the steel sheet was placed between the magnet and the paper clip. Magnetism cannot pass through magnetic materials like steel to attract the paper clip
A coin, a ceramic spoon and a plastic spoon were put in a basin of water.
What can be observed about the objects after 2 minutes
Explain your observation.
The coin and ceramic spoon sank in the water, while the plastic spoon floated in the water.
The coin and the ceramic spoon are denser/heavier than water, thus they sink in the water. The plastic spoon are less dense/lighter than water, thus it floats on water.
Material A is waterproof, not flexible and does not float on water. Material B is water proof, flexible and can float on water. Material C is not waterproof, is flexible and does not float on water.
Which material is most suitable for making a toy boat. Explain your answer.
Material B. A toy boat should float on water and Material B is the only material that can float on water.
4 similarly sized materials, A, B, C, D were weigh before and after being left in a basin filled with water for 15 minutes. A was 10g at first, after 10g. B 12g, 19g. C 20g, 22g. D 15g, 18g.
Which material is most suitable for making a bath towel. Explain why.
Which material is most likely to be a piece of plastic. Explain why.
Material B. The mass of it increased the most so it absorbed the most amount of water. Thus it is the most absorbent material, so it is most suitable to be made into a towel.
Material A. Its mass did not increase which means it did not absorb any water. Thus it is waterproof like a piece of plastic.
Material A is not easily broken and is transparent. B is easily breakable and is transparent. C is easily breakable and is not transparent.
Which material is likely to be ceramic? Explain your answer.
Which material is most suitable to be made in a milk bottle for babies? Explain your answer.
Material C. Ceramic is easily breakable but not transparent, like material C.
Material A. It is not breakable and the material used for a milk bottle should not be easily breakable. It is to prevent the baby from cutting themselves if the bottle breaks.
Explain why bicycle tires are usually made from rubber.
Rubber is flexible and is less likely to burst when air is pumped into it, and the rubber will not break easily when the tire is fitted into the wheel.
A magnetized needle was secured onto a cork and then laid onto a basin of water,. Explain how you could use this set up as a compass to tell the direction of the Earth’s North pole.
A freely hanging magnetized needle always points in a North-South direction. Hence we could follow the North-pointing end of the needle to the Earth’s North pole.
