Section 1: Work, Power, and Machines
Work and Energy
Section 1
Section 1: Work, Power, and Machines
Preview ? Key Ideas ? Bellringer ? What Is Work? ? Math Skills ? Power ? Machines and Mechanical Advantage
Work and Energy
Key Ideas
How is work calculated?
Section 1
What is the relationship between work and power?
How do machines make work easier?
Work and Energy
Section 1
Bellringer
1. Which of the following is an example of work: bowling or reading?
2. a. A man pushes against a brick wall, which doesn't move. Is this an example of work?
b. A student carries her books to class. Is this an example of work?
c. A woman raises and lowers dumbbells at the gym. Is this an example of work?
d. A book falls off a table and lands on the floor. Is this an example of work?
Work and Energy
What Is Work?
How is work calculated?
Section 1
Work is calculated by multiplying the force by the distance over which the force is applied.
? work = force x distance, or W = Fd
? The force must be applied in the direction of the object's motion.
Work and Energy
Section 1
What Is Work?, continued
? work: the transfer of energy to an object by the application of a force that causes the object to move in the direction of the force
? Work is zero when an object is not moving.
? Work is measured in joules (J): 1 N ? m = 1 J = 1 kg ? m2/s2
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