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Buoyancy
Test review
| Question | Answer |
|---|---|
| particle theory first part | Everything is made of particles (atoms) |
| particle theory second part | These particles are always moving – when they gain energy, they move faster. |
| particle theory third part | All particles in a pure substance are the same |
| particle theory fourth part | There is space between the particles |
| particle theory fifth part | The particles in a substance are attracted to one another |
| What are the 3 states of matter? | Solid, liquid and gas |
| What is volume? | The amount of 3-dimensional space an object occupies |
| What is the difference between mass and weight? | Weight can change depending on where you are (i.e. the moon) but your amount of matter stays the same |
| Mass | how much matter something contains |
| Weight | the amount gravity pulls on matter |
| How do we measure volume for regular shapes? | Use a formula i.e. length x width x height |
| How do we measure volume for irregular shapes? | for irregular shapes, any object displaces a volume of water equal to it’s own volume |
| What is density? | p=m/v |
| What is the density of an object that weighs 40g and has a volume of 5 cm³? | p=40g/5cm³ p=8g/cm³ |
| What is the density of water? | 1.00 g/cm³ |
| How much does 45 ml of water weight? | 45 grams |
| How much does 83 ml of water weight? | 83 grams |
| Why do objects sink with regards to density? | Objects sink if their density is greater than the density of water |
| Why do objects float with regards to density? | Objects float if their density is less than the density of water |
| What is a force? | A force is a push or a pull – a force changes the motion of an object |
| Balanced force | If opposing forces are balanced, an object that is not moving stays still |
| Unbalanced force | if the opposing forces are unbalanced there is movement |
| What unit is used to measure forces? | Forces are measured in Newtons (N) |
| What is buoyancy? | the force that pushes back up in fluids |
| How do you measure the buoyant force? | Place an object in water and measure how much water is displaced |
| What is Archimedes principle? | The buoyant force is equal to the weight of the displaced water. |
| What is another reason (besides density) that things float? | When an object’s buoyancy is greater than the force of gravity |
| What is ballast? | Ballast – any material carried that can alter your weight. |
| What are some examples of things that can control their buoyancy? | Fish bladders Seaweed Submarines Ballast bags on air balloons Scuba divers boats and ships Cartesian divers |
| If opposing forces are balanced then there is... | ...no motion or no change in motion |
| If opposing forces are unbalanced then there is... | ...motion or a change in motion |
| Using displacement, explain why something floats | An object floats if it displaces as much water as it weighs |
| If a boat is floating and it weighs 1000 g how much water is it displacing? | 1000g of water (or 1000ml of water) |
Created by:
devon science