Introduction to Work with Examples

The video tutorial explains the concept of work in physics, starting with the equation W = F * d * cos(theta). It uses examples, such as holding a dictionary, to illustrate when work is zero, positive, or negative. The tutorial also covers the dimensions and units of work, emphasizing that work is a scalar and can be negative. The video concludes with a discussion on scalars using money as an example.

What does the equation W = F * d * cos(theta) represent in physics?

• The equation for acceleration

• The equation for energy

• The equation for velocity

• The equation for work

In the example where Billy holds a dictionary, why is no work done on the book?

• Because the force is downward

• Because the angle is 90 degrees

• Because the displacement is zero

• Because the force is too small

When lifting a book upward, what is the angle between the force and displacement?

• 0 degrees

• 45 degrees

• 90 degrees

• 180 degrees

As the book is lowered, what type of work is done by the force applied?

• Negative work

• Positive work

• Neutral work

• Zero work

While walking with a book at constant velocity, why is the work done zero?

• Because the angle is 90 degrees

• Because the displacement is zero

• Because the force is downward

• Because the force is zero

What is the unit of work in physics?

• Pascal

• Joule

• Newton

• Watt

Why can work be considered a negative scalar?

• Because it is always positive

• Because it can be measured in negative units

• Because it can have negative magnitude

• Because it has direction