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Lecture 1: Forces and Newton's laws

Henry Tan's picture

When emailing the lecture-note to with the subject title as Lecture 1, please also put your information in the text message: Name, University ID, and Aerospace/Mechanical Engineering. Thanks.

  1. A force is a relationship
  2. A force is a vector

Newton's laws of motion

3rd law

 For every action, there is an equal and opposite reaction.

2nd law

Force is a vector, F
Acceleration is a vector, a

Galileo’s experiment
Leaning tower of Pisa
No matter what the difference in weight, two heavy objects will fall simultaneously at virtually the same speed
Experiment: drop of two objects with different masses
Resistance from air

Massive the object, more tends to resist changes in its state of motion
helmet  (design issue, protection and mobility)

1st law

An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

back to MACE-11010  Engineering Mechanics
back to MACE-11010 Calendar

PDF icon new_grading.pdf18 KB
Office presentation icon lecture1.ppt76 KB


Dear Mr. Tan,

 Yesterday (thursday, 4th oct.) there werent enough pages of notes to go around...and I asked you for some extras. You said they would be here, and so far they are not. When should I expect them here?

Thank you,


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