511574
Description
Mind Map by sian.allison, updated more than 1 year ago
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Created by sian.allison
almost 11 years ago
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Work and Potential Energy
- When a force moves an object through a
distance Energy is transferred and work
is done
- Whenever something moves something else
is providing some sort of effort to move it
- The thing putting the effort in needs a supply of energy e.g. fuel
- It then does work by moving the object and one way or another
it transfers the energy it receives (as fuel) into other forms
- Whether this energy is transferred or wasted you can still say that the work is done.
Work done and energy transferred are the same (there both given in joules)
- Whether this energy is transferred or wasted you can still say that the work is done.
Work done and energy transferred are the same (there both given in joules)
- It then does work by moving the object and one way or another
it transfers the energy it receives (as fuel) into other forms
- The thing putting the effort in needs a supply of energy e.g. fuel
- Whenever something moves something else
is providing some sort of effort to move it
- Work done = Force x Distance
- Gravitational Potential energy is energy due to height
- Gravitational potential energy (J) is the
energy that an object has by virtue of
(because of) its vertical position in a
gravitational field. When an object is
raised vertically work is done against the
force of gravity (it takes effort to lift it up)
and the object gains gravitational
potential energy. On earth the
gravitational field strength is 10N/kg
- A sheep with a mass of 47kg is slowly
raised through 6.3m. Find the
potential energy
- Ep = 47 x 10 x 6.3 = 2961J
- Ep = 47 x 10 x 6.3 = 2961J
- Gravitational potential energy (J) is the
energy that an object has by virtue of
(because of) its vertical position in a
gravitational field. When an object is
raised vertically work is done against the
force of gravity (it takes effort to lift it up)
and the object gains gravitational
potential energy. On earth the
gravitational field strength is 10N/kg
- Kinetic Energy
- Anything thats moving has kinetic energy
- Kinetic energy = 1/2 x mass x speed squared
- Remember the kinetic energy of something
depends on both mass and speed. The more it
weighs and the faster its going the bigger its
kinetic energy will be
- Kinetic energy transferred is work done
- When a car is moving it has kinetic energy
- A moving car can have a lot of kinetic energy. To
slow a car down the kinetic energy needs to be
converted into other types of energy
- To stop a car the kinetic energy
has to be converted to heat
energy as friction between the
wheels and the brake pads
causing the temperature of the
brakes to increase
- Kinetic energy transferred =Work done by brakes
- 1/2mv squared = F x d
- m= mass (kg), v=speed (m/s), F=maximum braking force (N), d=braking distance (m)
- m= mass (kg), v=speed (m/s), F=maximum braking force (N), d=braking distance (m)
- 1/2mv squared = F x d
- Kinetic energy transferred =Work done by brakes
- To stop a car the kinetic energy
has to be converted to heat
energy as friction between the
wheels and the brake pads
causing the temperature of the
brakes to increase
- A moving car can have a lot of kinetic energy. To
slow a car down the kinetic energy needs to be
converted into other types of energy
- Falling objects convert potential energy into kinetic energy
- When something falls its potential energy is converted into kinetic energy. So the further it falls the faster it goes
- kinetic energy gained = Potential energy lost
- kinetic energy gained = Potential energy lost
- When something falls its potential energy is converted into kinetic energy. So the further it falls the faster it goes
- Some of the kinetic energy is transferred into heat and sound
- When a car is moving it has kinetic energy
- Anything thats moving has kinetic energy
- Forces and Elasticity
- Work done to an Elastic object is stored as Elastic Potential Energy
- When you apply a
force to an object you
may cause it to stretch
and change in shape
- Any object that can go back to its
original shape after the force has
been removed is an elastic object
- Any object that can go back to its
original shape after the force has
been removed is an elastic object
- Work is done to an elastic object to change its
shape. This energy is stored by the object as
elastic potential energy
- The elastic potential energy is
then converted to kinetic energy
when the force is removed the
objects returns to its original
shape
- The elastic potential energy is
then converted to kinetic energy
when the force is removed the
objects returns to its original
shape
- When you apply a
force to an object you
may cause it to stretch
and change in shape
- Extension of an elastic object is directly proportional to force
- If a spring is supported at the top and then a weight is attached to the bottom it stretches
- The extension is directly proportional to the force
- The extension is measured in metres and the force in newtons
- F = k x e
- k=spring constant. It depends on the material that you are stretching (N/m)
- k=spring constant. It depends on the material that you are stretching (N/m)
- F = k x e
- The extension is measured in metres and the force in newtons
- The extension is directly proportional to the force
- If a spring is supported at the top and then a weight is attached to the bottom it stretches
- This stops working when the force is great enough
- Theres a limit to the
amount of force you can
apply to an object for the
extension to keep on
increasing proportionally
- For small forces force and extension are proportional.
- There is a maximum force that the
elastic object can take and still extend
proportionally. This is known as limit of
proportionality
- For small forces force and extension are proportional.
- Theres a limit to the
amount of force you can
apply to an object for the
extension to keep on
increasing proportionally
- Work done to an Elastic object is stored as Elastic Potential Energy
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