#### IIT (NTSE/Olympiad)

# Newton's Laws Of Motion & Friction

__Points to Remember - Newton's Laws Of Motion & Friction__

__Points to Remember - Newton's Laws Of Motion & Friction__

**POINTS TO REMEMBER**

**1.**Newton's I

^{st }Law of motion states that every body has tendency to oppose any change in its state of motion. This property of objects is called Inertia.

**2.**Inertia is of three types (i) Inertia of rest (ii) Inertia of motion and (iii) Inertia of direction.

**3.**Inertia ∝ mass.

**4.**Linear momentum = m

**5.**Newton's IIndlaw of motion states that rate of change of momentum is equal to applied force.

= = m

1 Newton = 10

^{5}dyne

**6.**Newton's Istand IIIrdlaw can be derived from second law therefore IIndlaw is the most fundamental law out of the three law.

**7.**Impulse = Δt = Δ=

**8.**According to law of conservation of linear momentum :

Initial Momentum = Final Momentum

m

_{1}u

_{1}+ m

_{2}u

_{2}= m

_{1}v

_{1}+ m

_{2}v

_{2}

**9.**Thrust on rocket

according as gravity is present or absent.

**10.**Acceleration of rocket

according as gravity is present or absent.

**11.**For equilibrium of a body under the action of concurrent forces = 0

**12.**Apparent weight of a body in the lift accelerated up is W = m (g + a).

**13.**Apparent weight of a body in the lift accelerated down is W = m (g – a)

**14.**If the downward acceleration of the lift is a = g, then W = 0 i.e. the body will enjoy weightlessness.

**15.**If the downward acceleration of the body is a > g, then W is negative, the body will rise up to the ceiling of lift.

#### IIT (Class X)

- Unit, Dimension & Error

- Vectors

- Motion in One Dimension

- PROJECTILE MOTION

- NEWTON'S LAWS OF MOTION & FRICTION
- 1. First Law Of Motion
- 2. Second Law Of Motion
- 3. Third Law Of Motion
- 4. Reference Frames
- 5. Motion in a lift
- 6. Motion of a Block on a Horizontal Smooth Surface
- 7. Motion of bodies in contact
- 8. Motion of connected Bodies
- 9. Motion of a body on a smooth inclined plane
- 10. Motion of two bodies connected by a string
- 11. Friction and frictional force
- 12. Graphical representation of friction
- 13. Types of frictional force and their definition
- 14. Angle of Friction
- 15. Minimum force Required to move a block
- Points to Remember - Newton's Laws Of Motion & Friction

- WORK, POWER, ENERGY & CONSERVATION LAWS

- CIRCULAR MOTION & ROTATIONAL DYNAMICS

- GRAVITATION