"Buoyancy" sinking and floating PPT

"Buoyancy" sinking and floating PPT

Part One Content: New Lesson Learning

feel buoyancy

Think about it: How do you feel when you swim with a swim ring, when you push down on a boat on the water with your hands, when you press on a foam block on the water with your hands?

Press the boat and foam plastic blocks into the water, and you can feel the upward force of the water on the boat and foam plastic blocks. We call this force the buoyancy of the water.

When the foam block floats at rest on the water, the buoyant force it experiences is equal to the gravity it experiences, and is opposite in direction and equal in size.

Measuring the buoyant force on a foam block

Measurement methods:

Install a small pulley or a small hook at the bottom of the cup, then use a thin wire to go around the hook, tie one end to the foam block, and hang the other end on the hook of the spring scale to measure its buoyancy.

How to use spring dynamometer

1. Observe whether the pointer points to the 0 scale line in its natural state.

2. Check whether the dynamometer is stuck and pull the spring hook to see if it is flexible.

3. Hang the object on the spring dynamometer so that the action line of the dynamometer force is in the same straight line as the spring expansion and contraction direction. Wait for the pointer to stabilize and take a reading.

Buoyancy PPT, part 2: expansion and extension

Archimedes, ancient Greek philosopher, mathematician, and physicist, was born in the Syracuse Valley of Sicily. Archimedes invented the Archimedes screw pump and is known as the "Father of Mechanics".

The waterline indicates the depth of the ship's immersion. Many horizontal horizontal lines are painted with paint next to the ship to indicate the draft depth at different loads. The highest waterline indicates the maximum safe load capacity.

Buoyancy PPT, Part 3: Summary of this lesson

When an object is put into water, whether it floats or sinks, the object is affected by buoyant force; as the volume of the same object immersed in water increases, the buoyant force it receives also increases.

Buoyancy PPT, Part 4: Training in this lesson

1. Fill in the blanks

1. Objects floating on the water, such as foam blocks, are affected by ( ).

2. Foam plastic blocks of different sizes are completely immersed in water, the volume ( ), and the impact ( ).

3. For a floating object, the buoyancy force is equal to ( ).

2. Judgment questions

1. All objects are subject to the buoyant force of water. ( )

2. We can feel the existence of buoyancy and measure the buoyancy with a dynamometer. ( )

3. Can use the concepts of buoyancy and gravity to explain the sinking and floating of objects in water. ( )

4. The size of the buoyancy force has nothing to do with the amount of water displaced by the object. ( )

Buoyancy PPT, Part 5: Homework

Use a spring dynamometer to measure the buoyancy of a small wooden block.

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