5/4/10

Post date: May 04, 2010 6:21:14 PM

Bell Ringer: What is a machine?

Chapter 13, section 1 notes

• • Work

    • To work, one must apply a force to an object over some distance.

    • W = F x d

    • Work is measured in Joules (J)

    • The force must be applied in the same direction as motion in order for work to be done.

  • Power

    • The rate at which work is done

    • P = W / t

    • Power is measured in Watts

  • Machines

    • Mechanical advantage is a measurement that describes how much a machine helps in terms of force

    • e.g. a mechanical advantage of 2 means that the machine puts out 2 times as much force as you put in. An MA of 3 means the machine puts out 3 times as much force as you put in.

  • Pulley Lab - due Thursday