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Chapter 4: Work and Machines 1. what is work? A. Force exerted on an object that cause it to move some distance. 1. If Object doesn't move- then NO work is done 2.the force you exert must be in the same direction as the object's direction. 3.Effort more effective when you reduce the angle at which you push or pull an object. i. Exert as much of your force as possible in the direction in the direction of the object's motion. 4. Work=Force x Distance i. measured in Newtons x meter ii. SI unit - Joule (J) a) James Prescott Joule b) physicist - 1800s iii. 1 Joule is the amount of work you do when you exert a force of 1 Newton to move an object a distance of 1 meter.

Quz 4.1 1.She is doing work if the box moves some distance in the direction of the force 2. work = force (newton) x distance(meters) 3. 80J 4. Exert a force on an object that causes it to move some distance in the direction of the force 5. Amount of work done when you exert a force of 1 newton to move an object a distance of l meter; the rate at which work is done.

Study Guide 1. the object must move some distance as a result of force 12. in the direction as the object's motion 13. distance 16. True 21. True