1. 3. Summary
◆ Summary
- Review the following key concepts. -
① Engineering Mechanics
② Vector Quantity, Scalar Quantity
③ Law of Parallelogram of Forces & Triangle of Forces
④ Units System
⑤ Relation of Statics and Force
⑥ Resolution of a Force
⑦ Systems of Forces
Week 1 Fundamentals of Engineering Mechanics:

2. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
1) What is engineering mechanics?
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3. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
1) What is engineering mechanics?
Engineering mechanics is that branch of science which deals
with the behavior of a body when the body is at rest or in
motion. The engineering mechanics may be divided into Statics
and Dynamics. The branch of science, which deals with the
study of a body when the body is at rest, is known as Statics
while the branch of science which deals with the study of a
body when the body is in motion, is known as Dynamics.
Dynamics is further divided into kinematics and kinetics. The
study of a body in motion, when the forces which cause the
motion are not considered, is called kinematics and if the forces
are also considered for the body in motion, that branch of
science is called kinetics.

4. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
2) Define the following terms:
① Vector Quantity
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5. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
2) Define the following terms:
① Vector Quantity
A quantity which is completely specified by magnitude
and direction, is known as a vector quantity. Some
examples of vector quantities are :
velocity, acceleration, force and momentum. A vector
quantity is represented by means of a straight line with an
arrow.

6. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
2) Define the following terms:
② Scalar Quantity
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7. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
2) Define the following terms:
② Scalar Quantity
Which is completely specified by magnitude only,
is known as a scalar quantity.
Some examples of scalar quantity are :
mass, length, time and temperature.

8. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
3) What is moment of a force?
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9. 3. Summary
◆ Question
Week 1 Fundamentals of Engineering Mechanics:
3) What is moment of a force?
Moment is the name given to the tendency of a force to
rotate, turn or twist a rigid body about an actual or
assumed pivot point.
Moments have primary dimensions of length force.
Typical units are foot-pounds, inch-pounds, and Newton-
meters.

10. 3. Summary(Real-life Example )
◆ Real-life Example of Fundamentals of rigid body
Ride your bike into class, apply the front brakes too hard so that
the rear wheel just begins to lift off the ground.
When the front brake is locked so that there is no motion of the
front wheel relative to the bike, then the bike (including the front
wheel) and backpack rotate about the point on the front wheel
that is in contact with the road, i.e. A
Week 1 Fundamentals of Engineering Mechanics:

11. 3. Summary(Real-life Example )
◆ Real-life Example of Principle of moment
Ride a skateboard into class. With this example the principle of
moment can be explained with two extreme side being supports.
Week 1 Fundamentals of Engineering Mechanics:

12. 3. Summary(Real-life Example )
◆ Real-life Example of System of Forces
The force exerted on systems of different masses produces different
accelerations. (a) A basketball player pushes on a basketball to make a
pass. (The effect of gravity on the ball is ignored.) (b) The same player
exerts an identical force on a stalled SUV and produces a far smaller
acceleration (even if friction is negligible). (c) The free-body diagrams are
identical, permitting direct comparison of the two situations.
Week 1 Fundamentals of Engineering Mechanics: