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# Chapter 14, Lesson 2- Newton's Second Law

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### Chapter 14, Lesson 2- Newton's Second Law

1. 1. mass acceleration/forceChapter 14, acceleration/mass balanced forces unbalanced forces Lesson 2 momentum action Newton’s reaction workSecond and simple machines leverThird Laws fulcrum effort arm of Motion resistance arm pulley wheel and axle inclined plane wedge screw
2. 2. mass – A measure of the amount of matter inan object. The mass of an object is related to the force required to accelerate it.
3. 3. acceleration/force – the more force you apply, the greater the acceleration Click on the picture for some great questions about acceleration and force!
4. 4. acceleration/mass – the greater the mass, the more force necessary to get an object to accelerate Click on the picture!
5. 5. balanced forces – when all the forces on an objectcancel each other out, you have balanced forces – no acceleration, no momentum Click on the picture for some great questions about balanced and unbalanced forces.
6. 6. unbalanced forces – when forces don’t cancel each other out, there is movement. This is a result of unbalanced forces.Click on the picture for some information about Click on the picture for some unbalanced forces. information about kinds of forces.
7. 7. momentum – momentum measures how difficult it will be to stop an object Click on the picture for some information about momentum.
8. 8. action – when one object applies a force to another object
9. 9. reaction – the force the second thing returns (the result of an action)
10. 10. work – using force to move an object through a distance
11. 11. simple machines – devices with few moving parts that make work easier to do. Click on the picture for some information about simple machines.
12. 12. lever – a rigid (solid, hard) bar that rests on a pivot point Click on the picture for a video on levers.Click on the picture for directions on how to build a lever. Click on the picture for some contraption videos using simple machines. Built by kids!
13. 13. fulcrum – a pivot point that a lever rests on. The (triangle in the diagrams below.)Click on the picture for directions on how to build a lever. Click on the picture for some contraption videos using simple machines. Built by kids!
14. 14. effort arm – the part of the lever that you apply force to (input force).Click on the picture for directions on how to build a lever. Click on the picture for some contraption videos using simple machines. Built by kids!
15. 15. resistance arm – the part of the lever that lifts the load (output force.)Click on the picture for directions on how to build a lever. Click on the picture for some contraption videos using simple machines. Built by kids!
16. 16. inclined plane – a ramp/slopeClick on the picture below watch a video incline planes.
17. 17. pulley – a wheel with a grove in the rim. A rope fits in the groove and helps lift the load.Click on the picture below watch a video on pulleys.
18. 18. wheel and axle – a wheel is a large diameter circle attached to a small diameter axle. A small amount of input force on the wheel creates alarge amount of output on the axle. Click on the picture to check out a video on screws and wheels.
19. 19. screw – an inclined plane wrapped in a spiral around a cylinder or cone. Click on the picture to check out a video on screws and wheels.
20. 20. screw – an inclined plane wrapped in a spiral around a cylinder or cone. Click on the picture to check out a video on screws and wheels.
21. 21. wedge – an inclined plane wrapped in a spiral around a cylinder or cone. Click on the picture to check out a Bill Nye Videos on simple machines.
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