Work
What is the formula for mechanical energy?
PE + KE
Work Done = ?
Change In Energy
What is the definition of power?
The rate of doing work, or the rate at which energy is converted.
What unit is kinetic energy measured in?
Joules
What is potential energy?
Energy that is stored in a person or object.
More work in less time is the...
best way to increase power.
What is the formula for work done?
W = (KE(f) - KE(I)) + (PE(f) - PE(I))
What is the formula for power?
1. Power = Work Done/Time Taken
2. Power = Energy Converted/Time Taken
What does kinetic energy depend on?
Mass & Speed
What is the formula for Gravitational Potential Energy?
u = mgh
What is work?
Work is the transfer of energy (Joules).
Energy cannot be...
created or destroyed.
What is the unit for power?
Watt
When Kinetic Energy is taken away from an object the particles...
start to slow down.
The potential energy due to the position of an object above Earth's surface is...
gravitational potential energy.
When is work done?
Work is done when objects are pushed or pulled, making the objects move.
What is the Work-Energy Theorem?
The Work-Energy Theorem states that work is equal to the change in kinetic energy.
What is the difference between power and work?
Work is the energy needed to apply a force to move an object a particular distance. Power is the rate at which that work is done.
What is the formula for kinetic energy?
K.E. = 1/2 m v2
What determines the potential energy of an object?
An object has gravitational potential energy due to its position above the ground (the higher the object is from the ground the higher its gravitational potential energy).
Work is measured in the same units (J) as...
Energy
A force of 20N is applied to a 2kg box on a frictionless surface. After 10m, how fast is the box moving?
14.14 J
A 220 V, 100 W bulb is connected to a 110 V source. Calculate the power consumed by the bulb.
25 W
What is kinetic energy?
Kinetic energy is the energy an object has because of its motion.
If a weight-lifer raises weights with a mass of 200 kg from the ground to a height of 1.5 m, the increase in their G.P.E is?
2940 J