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Engineering Mechanics - Basics and Statics of Particles - Important Short Questions and Answers: Basics and Statics of Particles

1. **Define force?**

Force is
a physical quantity that changes or tires to change the state of rest or of
uniform motion of an object

2. **Differenciate
between particles and rigid body?**

Particle
is a body which has mass but no dimension where as rigid body as both mass and
dimensions.Particle can have only translational motion where as rigid body can
have translational as well as rotational motion.

3. **State
newton’s first law of motion?**

Everybody
tries to be in it’s state of rest or of uniform motion along a straight line
unless it’s acted upon by an external unbalanced force .

4. **State
newton’s second law of motion?**

The rate
of change of momentum of a body is directly proportional to the applied force
and takes place in the direction of the force .

5. **State
newton’s third law of motion?**

Every
action has an equal and opposite reaction .

6. **State
law of parallelogram of vectors?**

If two
vectors are represented in magnitude and direction by two adjacent sides of a
parallelogram,their resultant is represented in magnitude and direction by the
diagonal of the parallelogram drawn from the common point.

7. **State
the principle of transmissibility of force with simple sketch?**

According
to principle of transmissibility of force,the force can be transmitted from one
point to another on it is line of action without causing by any change in the
motion of the object. EG:force F can be transmitted from A to B.

8. **Define
unit vector?**

A vector
having magnitude one unit is known as a unit vector .

9.
**Define
the following terms?**

(a)coplanar
forces (b)concurrent forces

(a)If all
forces act in one plane,they are known as coplanar forces.

(b)If
lines of action of all forces intersected at a single point,the forces are
known as concurrent forces.

10.
**Defferentiate
between collinear and concurrent forces?**

Collinear
forces act along the same line where as concurrent forces have lines of action intersecting
at one point.

11 **.Define
resultant of coplanar concurrent force system?**

A system
of coplanar concurrent forces can be reduced to a single force which is known
as resultant force.

12. **what is the difference between a resultant
force and equilibrant** **force?**

Resultant
force makes the object move whereas equilibrant force keeps it in equilibrium.

13.
**state
triangle law of forces?**

If two
forces are represented in magnitude and direction by two sides of a triangle
taken in order,their resultant is represented in magnitude and direction by the
third side of the triangle drawn from starting point of first force to end
point of the second force.

14.
**State
parallelogram law of forces?**

If two
forces are represented in magnitude and direction by two adjacent sides of a
parallelogram,their resultant is represented in magnitude and direction by the
diagonal of the parallelogram drawn from the common point.

15.
**Statelami’s
theorem?**

If three
concurrent forces are in equilibrium,magnitude of any force is proportional to
the sine of angle between the other two forces.

16. **State the necessary and sufficient
condition for static equilibrium of a** **particle
in two dimensions?**

For
static equilibrium of a particle in two dimensions,

i)The
algebraic sum of horizontal components of all forces acting the particle must
be zero.

ii) The
algebraic sum of vertical components of all forces acting the particle must be
zero.

17 **.State triangle law of equilibrium?**

If three
forces acting on a particle are represented by the three sides of a triangle in
magnitude and direction when taken in order,the particle will remain in
equilibrium.

18**.What is a free body diagram?**

A force
system,in a plane,in which the lines of action all forces intersect at a single
point is called coplanar concurrent force system.

1.Distinguish
the following system of forces with a suitable sketch. a) Coplanar b) Collinear
2.Define Kinetics and Kinematics

3.State
Lami’s theorem with a sketch.

4.State
parallelogram law and triangle law of forces. 5.What are fundamental and
derived units? Give examples 6.Distiguish between units and dimensions. Give
examples. 7.Define principle of transmissibility.

8.A force
vector F= 700i + 1500j is applied to a bolt. Determine the magnitude of the
force and angle it forms with the horizontal.

9.A force
of magnitude 50 KN is acting along the line joining A(2,0,6) and B(3,-2,0)m.
Write the vector form of the force.

10.Two
forces of magnitude 50 KN and 80 KN are acting on a particle, such that the
angle between the two is 135°. If both the force are acting away from the
particle, calculate the resultant and find its direction.

11.A 100N
force acts at the origin in a direction defined by the angles θx = 75° and θy = 45°.Determine θz and the component of the force
in the Z-direction.

12.Write
the equations of equilibrium of a coplanar system of forces. 13.Differentiate
between ‘Resultant’ and ‘Equilibrant’

14.Find
the resultant of an 800N force acting towards eastern direction and a 500N
force acting towards north eastern direction.

15.Find
the magnitude of the two forces such that if they act at right angles, their
resultant isÖ10 N. But if they act at 60° their resultant is Ö13 N.

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