Term
| Give equation for Kinetic Energy in terms of mass and velocity. |
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Definition
| Kinetic Energy = (1/2) x mass x velocity2 |
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Term
| Give the equation for Gravitational Potential Energy of an object in terms of the object's mass, the planet's gravitational field strength (g) and height of the object above the ground. |
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Definition
| Gravitational Potential Energy = mass x g x height |
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Term
In the equation:
Gravitational Potential Energy = mass x g x height
Does 'mass' refer to the mass of the lifted object or the mass of the planet that is pulling down on the mass of the lifted object? |
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Definition
| 'mass' refers to the mass of the lifted object. |
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Term
In the equation:
Gravitational Potential Energy = mass x g x height
Does 'height' refer to how tall the massive object is or to how far off the ground the massive object is? |
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Definition
'height' refers to how far off the ground the massive object is.
Stricky speaking 'height' here refers to how far off the ground the centre of mass of the object is. |
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Term
In the equation:
Gravitational Potential Energy = mass x g x height
What value do we normally take 'g' to be on Earth? |
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Definition
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Term
In the equation:
Gravitational Potential Energy = mass x g x height
What are the units of 'g'? |
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Definition
Newtons per kilogram (N/kg)
Notice that this has the units of Force (N) per mass (kg) |
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Term
In the equation:
Gravitational Potential Energy = mass x g x height
What physical quantity does 'g' represent?
(we are not looking for a number here) |
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Definition
| 'g' represents the gravitational field strength of the planet or moon that the massive object is on. |
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Term
When using the equation:
Gravitational Potential Energy = mass x g x height
What units should the mass be in? |
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Definition
kilograms (kg)
Remember: 1kg = 1000g |
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Term
When using the equation:
Gravitational Potential Energy = mass x g x height
What units should the height be in? |
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Definition
metres (m)
Remember:
1m = 100cm
1m = 1000mm
1m = (1/1000)km |
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Term
Give the units for:
Gravitational Potential Energy |
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Definition
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Term
Give the units for:
Kinetic Energy |
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Definition
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Term
Give the units for:
Work done (W.d.) |
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Definition
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Term
Give the units for:
Amount of energy stored (any type of energy store). |
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Definition
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Term
Give the units for:
Amount of energy transfered (any type of transfer) |
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Definition
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Term
| Name the 8 forms of energy store. |
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Definition
- Kinetic Energy (of moving, massive objects)
- Gravitational PE (of lifted, massive objects)
- Thermal Energy (of hot, massive objects)
- Elastic PE (of stretched/squashed, springy objects)
- Chemical (of food, muscles, plants, fossil fuels and batteries)
- Nuclear (of uranium 235 fuel rods)
- Electrostatic (of electrically charged objects)
- Magnetic (of magnets)
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Term
| Name the 4 main energy transfers. |
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Definition
Mechanical
Electrical
Thermal
Light/sound radiation |
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Term
When using the equation:
Kinetic Energy = (1/2) x mass x velocity2
What units should be used for velocity? |
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Definition
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Term
How many meters per second (m/s) is 1 kilometer per hour (1km/hr)? |
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Definition
We know:
- 1000m = km
- 3600s = hr (because there are 60x60s in 1 hr)
Use these as follows:
1km/hr = 1(1000m/3600s)
Now calculate:
1km/hr = 0.278m/s |
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Term
| What kind of energy store increases as a massive object gain as it is lifted? |
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Definition
The Gravitational Potential Energy of the object being lifted.
We have to say the form (GPE) and of what (the lifted object) |
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Term
| What is the principle of conservation of energy? |
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Definition
| Energy cannot be created or destroyed only transfered from one store to another store. |
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Term
| What is the definition of temperature? |
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Definition
| The average kinetic energy of particles. |
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Term
| What is the difference between thermal energy and temperature? |
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Definition
| Thermal energy the sum total of the kinetic energy of the particles whereas the temperature is the average kinetic energy of the particles. |
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