Simple Machines

Work the transfer of energy to an object by using a force that causes the object to move in the direction of the force W = F x d

Think-Pair-Share Select the activities below that require the least amount of work -carrying heavy books home -reading a 300-page novel -skiing for 1 hour -lifting a 45 kg mass -holding a steel beam in place for 3 h -jacking up a car

Joule (J) unit used to measure energy Example: W = F x d W = 80 N x 1 m 80 (N x m) 80 J

Power the rate at which work is done or energy is transformed P = Work divided by time P = W ÷ t Measured in watts (W): the unit used to express power (equal to J/s)

What is a machine? A machine is a device that makes work easier by changing the size or direction of a force.

Simple Machines Foldable Using a foldable, you are going to: Identify the six different types of simple machines Define each type of simple machine Give two real-world examples of each types of simple machine

1. Inclined Plane ramp or slanting surface that connects a lower level to a higher level

2. Lever stiff bar that rest on a support called a fulcrum

3. Pulley grooved wheel with a rope or cable around it

4. Screw an inclined plane wrapped around a pole

5. Wedge slanting side ending in a sharp point used to split, lift, or hold

6. Wheel and Axle circular device with a rod, called an axle, through its center

Complex Machines Two or more simple machines that work together to do work