Lecture 14 - Linear Kinetics 2

Question 1

How do you begin to evaluate forces in multiple directions?

Answer 1

By establishing a fame of reference

Question 2

How can you optimally set up a reference frame when analyzing forces in multiple directions?

Answer 2

Place the x axis coincident with the slope
The y axis perpendicular to the x axis
The origin at the center of mass of the person

Question 3

How must you handle vectors not coincident with an axis in your reference frame?

Answer 3

By considering both components of the force in the x and y direction

Question 4

What two things must you remember when using Newton’s second law to analyze forces?

Answer 4

Analyze the x and y directions separately and remember force is a vector

Question 5

What is Newton’s third law?

Answer 5

For every force there is an equal and opposite reaction force

Question 6

What does Newton’s first law tell you?

Answer 6

That you must supply a net external force to change the momentum of a system

Question 7

What does Newton’s second law tell you?

Answer 7

How effective a force is in changing momentum

Question 8

What does Newton’s third law tell you?

Answer 8

Indicates the origin of the forces