Calculating Work Before Calculating Work You first have

Calculating Work

Before Calculating Work… �You first have to decide if what you are doing IS work. �Rule 1: The object must move when the force is applied. �Rule 2: The object must move in the same direction as the force being applied to the object

Calculating Work �Work = Force x Distance �Work is measured in joules �Force is measured in Newtons �Distance is measured in meters �Work (j) = Force (N) x Distance (m)

Try This: � 3. What amount of work has been done if you apply 60 Newtons of force to lift an object one meter? �Work � (j) = Force (N) x Distance (m) 60 j = 60 N x 1 m

Try This: � 4. How much work have you done if you apply 10 Newtons of force to push a box 2 meters across the floor? � 20 j = 10 N x 2 m

Try This: � 5. How much work have you done by carrying your 13 Newton backpack 10 meters across the room? �None because the backpack is not moving in the same direction as the force being applied to hold the backpack up.

Try This: � 6. How much work have you done if you carry a 2 Newton object 10 meters across the room and place it up 1 meter on a shelf? � 2 j = 2 N x 1 m

Here’s a few student examples: �How much work have you done if you push your brother to get him out of your room? He weighs 50 N and he is 2 meters from the door. � 50 N x 2 M = 100 J

�How much work have you done if you take a 3 N hat and lift it 2 meters onto your head, then slide down a 40 meter hill? � 3 N x 2 M = 6 J

�. How much work have you done by carrying a 15 N backpack with 20 N of weights in it 20 meters up a hill? � 15 N + 20 N = 35 N � 35 N x 20 M = 700 J

Now create a few of your own!