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# Density and Buoyancy

PHYSP10
by

## Carrie Tam

on 6 March 2013

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#### Transcript of Density and Buoyancy

What is density? Which is heaviest? A. Lead

B. Copper

C. Aluminum

D. N/A What is density? Examples What is Buoyancy? POP QUIZ!!!!! What is buoyancy? TOPIC FOR TODAY Objects sink because the gravitational force is stronger than the buoyant force The density of the block
of wood floating in the
water is: A. Greater than the density of water.

B. Less than half that of water.

C. More than half the density of water.

D. ... Not enough information is given. Gently push down on the pan of the scale and the display shows an increase in force. Likewise if you do the same on the rim of the beaker. But what if you immerse your fingertip in the water, without touching the beaker? Then the scale reading: A. Does not change

B. Shows an increase

C. Shows a decrease If I poured 100ml of salt water into a 200ml beaker of fresh water, which would sink to the bottom? A. The salt water would sink to the bottom

B. The fresh water would sink to the bottom Activity 1 Objective: build a contraption that will stay afloat with the most weight Rules:
1. Must work together as a group to design and build
2. Only be made from 1 block of clay
3. Build time, 10min
4. Only one chance at testing
5. Winning contraption will support the most washers Activity 2 Objective: Get the diver to retrieve the treasure Procedure:
1. Carefully fill water bottle 3/4 full of water
2. Drop in both diver and treasure
3. Make sure diver floats and treasure sinks
4. Screw on bottle lid tightly
5. Experiment to get the diver to hook the treasure What is true about buoyant force? A. There is a greater pressure on the bottom of the object than on the top, therefore the buoyant force pushes the object up.

B. An object that floats is because the buoyant force is weaker than the gravitational force pulling it down.

C. Objects appear heavier in water because there is a buoyant force acting on it.

D. All of the statements are true. Picture This! A ball of clay will sink in a tub of water. How can we make it float? Picture This! How can we manipulate what's inside the bottle? Buoyancy = (density of water) (volume of object) (gravity)

Force acting on objects in a fluid
Reason why heavy objects appear lighter in water Picture This!
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