Reviewing the Density vs. Buoyancy Worksheet Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Reviewing the Density vs. Buoyancy Worksheet

First Things First!!! Be sure to write in correct answers for yourself and make corrections to help you study for any upcoming quiz Ask questions if you are unsure about an answer I have on the board… this is your chance to get feedback and to make sure you are on the right track PLEASE MAKE SURE YOU ARE KEEPING A TALLEY OF TOTAL MARKS IN THE MARGIN SO THAT I CAN SEE HOW YOU’RE DOING

Question 1 & 2 Buoyancy is the upward force (1 mark) Define the term “Buoyancy” and the type of force it exerts. Buoyancy is the upward force (1 mark) Buoyancy is exerted by a fluid (1 mark) Buoyancy works against the force of gravity (1 mark) What two forces act on an object that is submerged in a liquid? BUOYANCY (1 mark) GRAVITY (1 mark)

Question 3 Total of 3 marks for this question Sinks – Gravity is Floats – Buoyancy is Neutral – Both stronger than the stronger than the forces cancel each force of buoyancy force of gravity so other out so the so the diver sinks the diver floats diver is static

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 4 Does density of a fluid affect the strength of the buoyant force that fluid exerts on an object… Yes or No? Please explain how so? The more dense = The higher the = The more weight the liquid buoyant force off the object exerted The less dense = The smaller the = The less weight the liquid buoyant force off the object Total of 3 marks of this question

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 5 a) If you had a 500 g weight that you submerged into water (water has a density of 1.0 g/ml) on the end of a spring scale and the scale then read 450 g… what would you expect the spring scale to read if you submerged the same 500g weight into a glass of hand-soap with a density of 2.36 g/ml? Explain your answer… why?

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 5 a) If you had a 500 g weight that you submerged into water (water has a density of 1.0 g/ml) on the end of a spring scale and the scale then read 450 g… what would you expect the spring scale to read if you submerged the same 500g weight into a glass of hand-soap with a density of 2.36 g/ml? Explain your answer… why? Because the density of the hand-soap is greater than that of water, then we would expect MORE weight to be taken off of the 500 g mass. (1 mark) Therefore the spring scale should read anything less than 450 g (1 mark) Total of 2 marks for this question

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 5 b) If you had a 500 g weight that you submerged into water (water has a density of 1.0 g/ml) on the end of a spring scale and the scale then read 450 g… what would you expect the spring scale to read if you submerged the same 500 g weight in a glass of cooking oil with a density of 0.78 g/ml? Explain your answer… why?

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 5 b) If you had a 500 g weight that you submerged into water (water has a density of 1.0 g/ml) on the end of a spring scale and the scale then read 450 g… what would you expect the spring scale to read if you submerged the same 500 g weight in a glass of cooking oil with a density of 0.78 g/ml? Explain your answer… why? Because the density of the cooking oil is less than that of water, then we would expect LESS weight to be taken off of the 500 g mass. (1 mark) Therefore the spring scale should read anything more than 450 g (1 mark) Total of 2 marks for this question

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 6 a) Liquid Mass of weight before being submerged into the liquid Mass of weight after being submerged into the liquid How much weight was “taken off” 1 200 g 175 g  25 g 2 195 g 5 g 3 185 g  15 g 4 190 g  10 g ½ mark per blank… Total of 2 marks for this question

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 6 b) Based on the data in the chart above, which liquid was the MOST dense? Explain why The MOST dense liquid in the chart would have to be… Liquid 1 (1 mark) This is because liquid 1 took off the most weight, therefore it pushed upward with the strongest buoyant force, therefore it has to be the most dense (1 mark) Total of 2 marks for this question

Question 6 c) 1 Mark for this question Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 6 c) 1 Mark for this question Rank the densities of the liquids from MOST dense to LEAST dense based on their buoyancies. Liquid 1 Liquid 3 Liquid 4 Liquid 2

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 7 a) Liquid Mass of weight before being submerged into the liquid Mass of weight after being submerged into the liquid How much weight was “taken off” 1 500 g 475 g  25 g 2 435 g 65 g 3 485 g  15 g 4 450 g  50 g ½ mark per blank… Total of 2 marks for this question

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 7 b) Based on the data in the chart above, which liquid was the LEAST dense? Explain why The LEAST dense liquid in the chart would have to be… Liquid 3 (1 mark) This is because liquid 3 took off the least weight, therefore it pushed upward with the weakest buoyant force, therefore it has to be the least dense (1 mark) Total of 2 marks for this question

Question 7 c) 1 Mark for this question Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 7 c) 1 Mark for this question Rank the densities of the liquids from MOST dense to LEAST dense based on their buoyancies. Liquid 2 Liquid 4 Liquid 1 Liquid 3

Good Quiz Questions Why do we need a plimsoll line on the sides of ships that sail around the world? Why is it important to follow the plimsoll line when loading a ship? Why is the Tropical Fresh water line the highest? Why is the WNA line the lowest? Draw a diagram that depicts what will happen to the boat as it sails from St. Johns New Foundland (WNA) to the Panama Canal (TF)

Question 8 Why do we need a plimsoll line on the sides of ships that sail around the world?

Question 8 Why do we need a plimsoll line on the sides of ships that sail around the world? Different waters around the world have different densities (1 mark) Ships that sail from fresh water into salt water, (1 mark) Or from cold water into warm tropical water (1 mark) will encounter different densities.

Why is it important to follow the plimsoll line when loading a ship? Question 9 Why is it important to follow the plimsoll line when loading a ship?

Question 9 Why is it important to follow the plimsoll line when loading a ship? Ships that sail to and from the different types of water will rise or sink higher or lower into the water based on the different buoyant forces each type of water exerts on the ship. (1 mark) Without the plimsoll line, ships might over load and sink as they sail into less dense water. (1 mark)

Why is the Tropical Fresh water line the highest? Question 10 Why is the Tropical Fresh water line the highest?

Lesson 44 - Reviewing the Density vs. Buoyancy Worksheet Question 10 Why is the Tropical Fresh water line the highest? Tropical water is very warm and we know that as we warm up water, the particles move farther apart (1 mark) The warm water becomes less dense when its warm. (1 mark) Also, we know that fresh water is less dense than salt water because there are no salt particles in it. (1 mark) Therefore, a ship that loads in Tropical Fresh water, will never sink lower into the water. So it can be loaded to the point where it rides very low in the water because it will never sink any lower in another type of water. (1 mark)

Why is the WNA line the lowest? Question 11 Why is the WNA line the lowest?

Question 11 Why is the WNA line the lowest? North Atlantic water is very cold and we know that as we cool water, the particles move closer together (1 mark) The water becomes more dense when its cold. (1 mark) Also, we know that salt water is more dense than fresh water because of all the salt particles mixed in. (1 mark) Therefore, a ship that loads in Winter North Atlantic Salt Water, could sink much lower into the water as it sails into warmer, fresher waters. (1 mark) So it can’t be loaded all the way down, because it will eventually ride lower and lower in the water. (1 mark)

Question 12 Draw a diagram that depicts what will happen to the boat as it sails from St. Johns New Foundland (WNA) to the Panama Canal (TF) Winter North Tropic Ocean Tropical Fresh Atlantic Water Water Water

Question 12 Draw a diagram that depicts what will happen to the boat as it sails from St. Johns New Foundland (WNA) to the Panama Canal (TF) Winter North Tropic Ocean Tropical Fresh Atlantic Water Water Water

Did You Know? The zebra muscle will bind to any underwater surface including the hulls of ships They can become so numerous (1 million / m²) and double up so badly that they can change the average density of a ship and unbalance the ship to the point that it will tip if a large wave or storm creeps up on it The zebra muscle has even be known to attach to buoys marking dangerous rocks. They collect so much, that the buoy will sink and ships hit the rocks