Numericals from the Chapter "Force and Laws of Motion" for Class 9th

Introduction:
The chapter "Force and Laws of Motion" is an important topic in class 9th Physics. It helps us understand how objects move and what factors impact their motion. To better understand the concept of force and laws of motion, we need to solve various numericals related to the topic.

Numericals:
Here are some important numericals related to the topic:

1. A body of mass 10 kg is moving with a speed of 5 m/s. Calculate its momentum.

Momentum = Mass x Velocity
P = m x v
P = 10 kg x 5 m/s
P = 50 kg m/s

2. A force of 20 N is applied to a body of mass 5 kg. Calculate its acceleration.

Force = Mass x Acceleration
F = m x a
20 N = 5 kg x a
a = 4 m/s²

3. A car of mass 1000 kg is moving at a speed of 20 m/s. What will be its kinetic energy?

Kinetic Energy = (1/2) x Mass x Velocity²
K.E. = (1/2) x 1000 kg x (20 m/s)²
K.E. = 200,000 J

4. A ball of mass 0.5 kg is thrown vertically upwards with a velocity of 10 m/s. Calculate the maximum height reached by the ball.

Initial velocity = 10 m/s
Final velocity = 0 m/s (at maximum height)
Acceleration = -9.8 m/s² (due to gravity)

Using the kinematic equation:
Final velocity² = Initial velocity² + 2 x Acceleration x Height
0² = 10² - 2 x 9.8 x H
H = 5.102 m

Conclusion:
Solving numericals related to the topic "Force and Laws of Motion" helps students to better understand the concepts. These numericals help students to apply the laws of motion and to calculate various physical quantities like momentum, acceleration, kinetic energy, etc.

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