Lecture 3

Question 1

What is the difference between rectilinear and curvilinear movements?

Answer 1

RL- all points move in straight line with no change in direction or orientation, and all points move the same distance.

CL- all points move so the orientation of the object does not change and all points move the same distance, but the direction changes.

Question 2

What do most movements consist of?

Answer 2

A combination of translational and rotational movements.

Question 3

What is the difference between distance and displacement?

Answer 3

Distance is the length of the actual motion and is scalar and Displacement is a change in position, measured as a straight line from initial position to final position.

Question 4

What is the difference between speed and velocity?

Answer 4

Speed is the distance covered over a period of time and is a scalar quantity and velocity is the change in position over a period of time and is a vector quantity.

Question 5

How do you determine if velocity is positive, negative or zero from a graph?

Answer 5

Start at the left most tip and follow it- goes up (+) , goes down (-) and no difference = (0).

Question 6

How do you calculate instantaneous velocity?

Answer 6

Take the time and distance before and after the time in question.