8.5

8. What is friction and what are the two types of friction?

9. What is your normal force in pounds?What is your normal force on a 30^o incline?

10. Can the coefficient of friction be greater than one? Is it generally?

11. How can you demonstrate to someone the necessity of being more careful on wet roads?

12-13. What is the normal force of a 120 KG object, if the coefficient of static friction is 0.8, how much sideways force would it take to start it moving? If the coefficient of sliding friction is 0.65, what sideways force is required to keep it moving? If sliding an object across the floor is it best to keep it moving? why or why not?

14. If a 120N object is on a surface with static coefficient of 0.75, and you apply 30N of sideways force why doesn't the object move? What supplies the force opposite to the the direction of the push, and what is the magnitude of that force?

15. If a 300 N object is on a 20 degree incline plane what coefficient of static friction is required to prevent it from sliding?