ENERGY
This is the ability to do work or cause change.
What is energy?
A push or pull on an object.
What is a force?
Scientific work occurs when a force causes an object to change this.
What is its motion?
These two quantities are multiplied to calculate work.
What are force and distance?
This is the rate at which work is done.
What is power?
Light, sound, and electricity are all examples of these.
What are forms of energy?
An object is in this state when its position changes relative to another object.
What is motion?
If you push hard on a stuck jar lid and it does not move, this amount of scientific work is done.
What is zero work?
The SI unit of work, equal to one newton-meter.
What is a joule?
Power equals work divided by this quantity.
What is time?
Food transfers this type of stored energy to your body.
What is chemical energy?
Energy must be supplied for this to occur.
What is motion?
Maximum work occurs when force and movement point in this relationship.
What is the same direction?
A 20-N force moves a box 3 m. The work done is this.
What is 60 joules?
The SI unit of power, equal to one joule per second.
What is a watt?
Energy from the Sun reaches Earth in this form.
What is electromagnetic radiation?
On a construction site, machines use energy to apply this, which can cause motion.
What is force?
Carrying books horizontally at constant speed does little scientific work because your upward force is this to the motion.
What is perpendicular (or vertical while motion is horizontal)?
An 80-N upward force lifts a baby 1.5 m. The work done is this.
What is 120 joules?
A machine does 600 J of work in 3 s. Its power is this.
What is 200 watts?
Although energy cannot be seen directly, these can be observed—such as heat felt or sound heard.
What are the effects of energy?
In the lecture examples, using more energy allows an object to do this.
What is move faster?
When work is done on an object, some of this is transferred to the object.
What is energy?
A student does 450 J of work using a 90-N force. The object moves this distance.
What is 5 meters?
Compared with a 60-W bulb, a 100-W bulb transfers this much more energy each second.
What is 40 joules more per second?