x2 p125 Force Table Rev by Crivello Jan 2010

# x2 p125 Force Table Rev by Crivello Jan 2010 - Physics...

This preview shows pages 1–3. Sign up to view the full content.

Physics 125-Force Table 1 SAN DIEGO MESA COLLEGE Name_________________________ PHYSICS 125 LAB REPORT Date__________Time___________ Partners______________________ TITLE: The Force Table ______________________________ _____________________________ Objective: To acquaint the student with the concepts of vector components and vector addition. Theory: A vector A r is a quantity that has both magnitude and direction. The sum S r = A r + B r of two vectors A r and B r is defined either by the triangle rule or the parallelogram rule: The triangle rule is easily generalized to more than two vectors. When x and y axes are chosen, the components of A r are defined by θ sin cos A A A A y x = = where y x A and A are scalars, not vectors, and is the angle between the vector and the x-axis. If x ˆ and y ˆ denote unit vectors in the x and y directions respectively, we can write A r x = A x x ˆ A r y = A y y ˆ Then A r = A r x + A r y Rev. by Crivello 1-20-2010 A r B A S r r r + = B r A r B r B A S r r r + = x y A r y A r x A r A r x y θ y A x A

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Physics 125-Force Table 2 The vector sum can also found by the component method that relies on the equations y y y x x x B A S B A S + = + = The magnitude and direction of S can then be found from Using the Pythagorean formula: x y y x S S S S S 1 2 2 tan - = + = θ The reverse vector A r has the same magnitude of A r but in the opposite direction. We will learn this semester that Force is a vector. When a number of forces A r , B r , C r ,…. act on a small object, the condition for it to remain at rest is that the vector sum of the forces is zero: A r + B r + C r +··· = 0 If only two forces act on the object, one must be the reverse of the other because
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 9

x2 p125 Force Table Rev by Crivello Jan 2010 - Physics...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online