Work, energy and power

• If the force acts at right angles to the displacement then no work is done as there is no component of the force along the line of motion.
• The work done by a constant force acting on an object moving through a displacement can be calculated using the equation W = Fd cosθ where d is the length of the displacement vector and θ is the angle between the force vector and the displacement vector.
• Work done by a force is the product of the magnitude of the force and the distance moved in its direction
• Work can be transferred from one object to another by doing work on it or by allowing an object to do work on us.
• The unit of work is joules (J).
• Potential Energy (PE) - The stored energy that an object possesses because of its position or shape
• A system is any part of the universe which we are interested in studying
• Energy cannot be created nor destroyed but only transformed into different forms
• Kinetic Energy (KE) - The energy possessed by an object due to its motion
• Kinetic energy is the energy that an object has because of its movement.
• Kinetic energy is given by KE = 1/2 mv^2
• Kinetic Energy (KE) - The energy possessed by an object due to its motion
• Kinetic energy is the energy that an object has because of its movement.
• There are two types of energy - kinetic energy and potential energy.
• There are two types of energy - kinetic energy (energy due to movement) and potential energy (stored energy)
• Energy is defined as the ability to do work.
• There are two types of energy - kinetic energy and potential energy.
• Kinetic Energy (KE) - The energy possessed by an object due to it being in motion
• Energy is defined as the ability to do work.
• A spring has elastic potential energy stored within it which increases with increasing stretch/compression.
• Kinetic Energy (KE) - The energy possessed by an object due to it being in motion
• When a spring stretches or compresses, the extension is directly proportional to the applied force up to the point that the spring breaks.
• Energy is defined as the ability to do work
• The unit of kinetic energy is joules (J)
• Power = Work / Time taken
• 1 horsepower = 746 Watts
• The unit of kinetic energy is joules (J)
• Work done = Force x Distance moved in direction of force
• 1 horsepower = 746 Watts
• A spring has elastic potential energy stored within it which increases with increasing stretch/compression.
• 1 watt = 1 Joule/second
• Work done = Force x Distance moved in direction of force
• A spring has elastic potential energy stored within it which increases with increasing stretch/compression.
• Power = Work done / Time taken
• 1 watt = 1 Joule/second
• Unit of Power is Watts (W)
• Power = Work done / Time taken
• Elastic Potential Energy (EPE) - The potential energy stored when two objects are pulled apart by elastic forces
• Power = Rate at which work is done
• 1 watt = 1 Joule/second