Fluids Grade 8

True or False

100

Fluids include solids and liquids.

False

200

The slave piston is always bigger than the master piston.

True

300

Chemical composition is one of the 4 factors affecting viscosity

True

400

The lungs act as the 'master piston' of our pneumatic system

False (Diaphragm)

500

To calculate mass, we divide volume by density

False (multiply volume by density)

Calculate Density

100

The mass of an object is 500g, and the volume is 100cm³. What is the density?

5g/cm³

200

The mass of an object is 1200kg, and the volume is 400m³. What is the density?

3kg/m³

300

The density of an object is more than the density of water. When I put the object in water, will it be positively, negatively, or neutrally buoyant?

Negatively buoyant.

400

An object has a mass of 6kg, and its volume is 60m³. What is the density?

0.1kg/m³

500

An object has a mass of 7kg, and its volume is 35m³. What is the object’s density?

0.2kg/m³

Hydraulic Equations

100

How much force will it take to lift a 100kg object when the slave piston is 10 times bigger than the master piston?

10kg of force

200

How much force will it take to lift a 56kg object if the slave piston is 8 times bigger than the master piston?

7kg of force

300

How much force will I need to lift an 750kg object when my slave piston is 200cm² and my master piston is 40cm^2?

150kg of force

400

How much force is needed to lift a 153kg object when the slave piston is 117cm² and the master piston is 13cm²?

17kg of force

500

How much force will be needed to lift a 315kg object if the slave piston is 91cm² and the master piston is 13cm²

45kg of force

Flow and Viscosity

100

The ability to flow is the trait of which two states of matter?

Liquid and gas

200

Name one way we can change the density of a fluid 

Temperature, pressure, chemical composition, and suspension of particles

300

What happens to the viscosity of a LIQUID when you heat it up?

It becomes LESS viscous

400

Name 2 fluids with low viscosity

water, oil, gasoline, any thin fluid!

500

Name the 4 factors that affect viscosity

Temperature, pressure, suspended particles, and chemical composition

Compression and Buoyancy

100

What experiment did we do in relation to buoyancy?

The rubber ducky experiment

200

Name our body’s pneumatic system

Respiratory system

300

Name a time humans would wish to be neutrally buoyant

Scuba diving, riding any object that is neutrally buoyant (Plane, submarine, hot air balloon..)

400

When a solid has the same density as water, what type of buoyancy will that solid have?

Neutral Buoyancy

500

Name the object in the classroom that contains compressed gas

Fire hydrant