Understanding Work Done by a Constant Force Learning Goal: To explore the defini

Question

Understanding Work Done by a Constant Force Learning Goal: To explore the definition of work and learn how to find the work done by a force on an object. The word "work has many meanings when used in everyday However, in physics work has a very and specific definition. definition is important to learn understand. Work and energy are two of the most fundamental and important concepts you will learn in your study of physics. Energy cannot be created or destroyed; it can only be transformed from one form to another. How this energy is ferred affects our daily livrae finnm mirrencernninnrennaeeae nrentai Figure 1 of 2 O

Explanation / Answer

W = F.d (dot product)

= F d cos(theta)

where theta -> angle between F and d.

(A) theta = 0 deg

cos(0) = 1

so positive work done.

(B) theta = 90 deg

cos(90 ) = 0

Zero.

(C) theta = 180 deg

cos(180) = -1

negative.

(D) theta = 90 deg

cos(90) = 0

Zero.

(E) d = 0

W = 0 J

(F) W = w d cos(90 - phi)

(G) theta = 90 deg

Work done = 0

(H) Work done = - change in PE

= - k x^2

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