1. Laws of Motion and Force Diagrams Many of the following slides are from the online physics site: http://www.learnconceptualphysics.com/resources/powerpoint /ch4-6-newtons_laws.pptx.pdf

3. On the left, cancels, leaving kg.

4. A net force of 60 N causes the 15 kg girl to accelerate down the slide. What is her acceleration? F = m * a Use correct units and solve. http://www.learnconceptualphysics.com/resources/powerpoint/ch4- 6-newtons_laws.pptx.pdf

5. Practice: A 30 N net force causes a 10 kg mass to accelerate. Calculate the acceleration A 100 N net force causes an acceleration of 5. What is the mass of the object? What force does the ground give to stop a 25 kg object in freefall?

6. Free-body Diagrams A free-body diagram shows all the important forces acting on an object, with labelled vectors drawn to indicate the magnitude and direction of those forces.

8. The forces are equal and balanced on the box.

9. In a free body diagram, the direction and length/thickness of the vector arrow indicates the direction and strength of the force.

10. The length and direction of the arrows make it clear that the greatest force is ________________________ So the box will move __________________________

11. http://www.learnconceptualphysics.com/resources/powerpoint/ch4- 6-newtons_laws.pptx.pdf

12. http://www.learnconceptualphysics.com/resources/powerpoint/ch4- 6-newtons_laws.pptx.pdf

13. What will the net force, or resultant, be?

14. http://www.learnconceptualphysics.com/resources/powerpoint/ch4-6-newtons_laws.pptx.pdf

15. Finding F net (net force) is the same as finding the resultant vector 1. The parallelogram method

16. 2. The head-to-tail method of vector addition:

17. Use trigonometry: Pythagorean theorem; Or SOH, CAH, TOA Remember the 3, 4, 5 triangle and the 45 degree right triangle.

18. The opposite vector to the resultant is the equilibrant…..Why????? The equilibrant is the force that would balance out the resultant.