1st year physics chapter 3 by Syeda fatima Rizvi

1. MOTION
CHAPTER 03
Prepared by Syeda Fatima Rizvi

2. MOTION
 Rest and motion.
 Velocity and its types.
 Acceleration and its types.
 Laws of Motion.
 Motion of bodies connected by a string.
 Linear Momentum
 Elastic Collision in one dimension.
 Friction and inclined plane.

3. MOTION REST

4. Velocity
Uniform Velocity
When a body covers equal
displacement in equal interval of
time, then the body is said to move
with uniform velocity.
Variable Velocity
When a body covers different
displacement in equal intervals of
time, then the body is said to move
with variable velocity.
Instantaneous
Velocity
The velocity of a body, at any instant
of time, is called instantaneous
velocity.

5. Acceleration
Positive Acceleration
If the velocity of a body increasing,
then acceleration is positive.
Negative Acceleration
If the velocity of a body decreasing,
then acceleration is negative.
Instantaneous
Acceleration
The acceleration of a body at any
instant of time is called instantaneous
acceleration.

6. Newton’s First law of Motion

7. STATEMENT:
‘ A body remains at rest, or continues to move
to move with uniform velocity in a straight line,
straight line, unless acted upon by an external
external unbalanced force’
INERTIA:
Inertia is that property of matter by virtue of
which it tries to remains in it existing state.

8. Newton’s 2nd law of Motion

9. “
”
If a certain unbalanced force acts upon a body, it will accelerate the body
in the direction of force. The magnitude of the acceleration is directly
proportional to the magnitude of unbalanced force.
a ∞ m
a ∞ 1/m
F = ma

10. Newton’s 3rd law of Motion
“ To every action, there is always an equal and
opposite reaction”

11. Tension in String
When both bodies move vertically
 Case I
When one body moves vertically and other
body moves on a smooth horizontal surface
 Case2

12. Linear Momentum
Definition:
Total motion present in a body is
called momentum.
Mathematical definition:
The product of pass and velocity is
called momentum.
Formula:
P = mv
Unit:
The S.I unit of momentum is Ns or kg
m/s

13. Friction
Frictionis a force which is alwaysoppositein direction of motion.
Static friction limiting friction Kinetic friction
When force is applied to
move a body and the
body remains at rest,
then the friction
between the bodies in
contact is called static
friction.
When one body is just at
the point of sliding on
the other, the friction is
said limiting. It is the
maximum value of static
friction.
When one body is
actually sliding on the
other, the friction is said
to be kinetic or dynamic.
It is less then limiting
friction.

14. Inclined plane
Any plane which makes certain angle with the horizontal plane is called an inclined plane

15. THE
END