We are bringing you a precise article series on ICSE Class 10 Physics. you can use this article series for your exam preparation. Every topics of ICSE Class 10 Physics are covered in this series.
Force
Force may be defined as an external agency or cause (a push or a pull), which changes or tends to change the state of rest or of uniform motion or the direction of motion of a body.
In mathematical form, it is defined as the rate of change of linear momentum,
\\ &F \propto \frac{\text { Change in momentum }}{\text { Time }} \\ & F \propto \frac{p_1-p_2}{t} \\ & \Rightarrow F \propto \frac{m(v-u)}{t} \\ & \Rightarrow F \propto m a \quad\left[∵ \frac{v-u}{t}=a\right] \\ & ∴ \quad F=k m a \\ & \end{aligned}
The quantity ‘k’ is a constant of proportionality. One unit of force is defined as the amount that produce an acceleration of 1 m/s2 on an object of 1 kg mass.
i.e. 1 unit of force = k x 1 kg x 1 m/s2
Thus, the force can be written as F=ma
SI unit is newton (N) or kilogram-force (kgf), where 1 kgf = gN. If ‘g‘ is the acceleration due to gravity 9.8 m/s2.
A force applied on an object can produce four types of effects such as
(i) Force can start a stationary object and can stop a moving object.
(ii) Force can change speed of a moving object making it to move slower or faster.
(iii) Force can change the direction of motion of an object.
(iv) Force can change the shape of an object.
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Frequently Asked Questions (FAQs)
Q1. What is force?
Ans. Force is a physical quantity that can change the state of motion or shape of an object. It is a vector quantity, meaning it has both magnitude and direction.
Q2. What are the different types of forces?
Ans. Forces can be categorized into various types, including gravitational force, frictional force, normal force, tension force, applied force, and spring force, among others.
Q3. What is Newton’s first law of motion?
Ans. Newton’s first law of motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This principle is also known as the law of inertia.
Q4. What is Newton’s second law of motion?
Ans. Newton’s second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, it can be expressed as F = ma, where F represents force, m represents mass, and a represents acceleration.
Q5. What is Newton’s third law of motion?
Ans. Newton’s third law of motion states that for every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.
Q6. How do forces affect motion?
Ans. Forces can cause changes in the motion of objects. They can accelerate objects, decelerate them, change their direction of motion, or deform them depending on the direction and magnitude of the force applied.
Q7. What is frictional force?
Ans. Frictional force is the force that opposes the motion of objects in contact with each other. It arises due to the roughness of surfaces and plays a crucial role in various everyday phenomena, such as walking, driving, and gripping objects.
Q8. How is force measured?
Ans. Force is measured in the SI unit called the newton (N). One newton is defined as the force required to accelerate a mass of one kilogram by one meter per second squared (1 N = 1 kg * m/s^2).
Q9. What are some real-life examples of forces?
Ans. Forces are prevalent in numerous real-life situations, such as the gravitational force between the Earth and objects on its surface, the tension force in a rope or string, the frictional force between surfaces, and the force exerted by muscles to lift or push objects.
Q10. How can I calculate the net force acting on an object?
Ans. To calculate the net force acting on an object, you need to consider the vector sum of all the individual forces acting on it. If forces are acting in the same direction, you add their magnitudes. If they are acting in opposite directions, you subtract the smaller magnitude from the larger one, and the resulting value indicates the net force and its direction.
We hope the series “Articles for ICSE Class 10 Physics” for will help you in your exam preparation.