Instasolv

IIT-JEE NEET CBSE NCERT Q&A

4.5/5

# Fundamentals of Physics Chapter 5 Solutions: Force and Motion-I

Halliday Resnick & Walker Fundamentals of Physics Volume 1 Solutions for Chapter 5 ‘Force and Motion – I’ will guide you with everything about how the objects move when force is applied on to them. The topics covered in this chapter of Resnick Halliday Solutions are force, newton’s law, types of forces, and mass. After studying all the concepts, you will be able to identify how and what amount of force is required to move a particular object, what amount of friction stops an object to move further, and how we can apply Newton’s law in different situations.

Resnick Halliday and Walker Fundamentals of Physics Volume 1 Force and Motion solutions include 97 questions in 4 modules. The chapter consists of questions where you are required to find the magnitude of acceleration, the mass of the body, force applied, net force, and angle related to positive x-direction. Practising the questions of Halliday Resnick Physics is very important as you will be able to answer questions in the competitive exams like JEE Mains and NEET.

The team of Instasolv comprises experienced professionals who provide you Resnick Halliday and Walker Force and Motion Solutions to all the questions mentioned in the book. All the questions are solved in a stepwise manner to make learning easy. Follow these solutions for free and ensure your sturdy preparation for Physics exams.

## Important Topics for Halliday Resnick Fundamentals of Physics Volume 1 Solutions Chapter 5 Force and Motion – I

Force

Do you know that physics is also a study of what really causes an object to accelerate? The cause that accelerates an object is known as force. Force refers to the push or pulls on an object. The force changes the velocity of an object.

For example, when a car accelerates, there is a force from the roads on the rear tires that cause acceleration. Force is a vector quantity that has magnitude as well as direction.

Unit for Force

Force is calculated in Newton. One Newton refers to the force that is required to accelerate one kilogram of mass at the rate of one meter per second squared in the applied force direction.

Newtonian Mechanics

Issac Newton was the first scientist who understood the relationship between a force and acceleration. In this chapter, you will study about Newtonian mechanics that include primary laws of motion and other aspects.

Newton’s First Law

It was noticed that in order to keep an object moving, it is necessary to pull or push it. Otherwise, it will stop naturally. For example, If you send a puck sliding across a wooden floor, it does indeed slow and then stops. If you want to make it move across the floor with constant velocity, you have to continuously pull or push it. Thus, Newton proposed the first law:

If no force acts on a body, the velocity of the body cannot change which means the body cannot accelerate.

Inertial Referral Frames

When Newton’s first law is not true in different reference frames, such special frames refer to an inertial reference frame.

Mass

When the force is applied to an object, it causes acceleration. The more the body mass, the less the acceleration. Thus, acceleration is inversely related to the mass of an object. In the chapter, you will study how this relationship is justified.

Newton’s Second Law

When the net force on a body is equal to the product of acceleration and its mass.

Some Particular Types of Forces

• Gravitational force

The gravitational force on a body refers to the pull by another body. In most cases, the other body refers to earth or any astronomical body. When the other body is earth, the force directs the object down to the ground which is the inertial frame.

Thus, the magnitude of the force is

Fmg = mg, where m is the mass of a body, and g is the free-fall acceleration.

Weight

The weight of a body refers to the magnitude of the upward forces that are required to balance the gravitational force that acts on a body.

The weight of the body can be calculated as:

W = mg

• Normal Force

Normal force refers to the force on the body from a surface against which the body presses. Also, the normal force acts in a perpendicular direction to the surface.

• Frictional Force

This type of force is a force on the body or an object when it slides or tries to slide along a surface. This force always acts in a parallel direction to the surface and directed so as to mainly oppose the sliding. Also, on any surface that is frictionless, the frictional force is negligible.

Newton’s Third Law

Whenever there is an interaction between two bodies, the force on the bodies that are applied to each other is equal in magnitude and also, opposite in direction.

### Exercise Discussion of Resnick Halliday & Walker Fundamentals of Physics Volume 1 Solutions Chapter 5 Force and Motion – I

Module 1: Newton’s First and Second Laws

This module of Resnick Halliday has 12 questions in which different situations are given. In these aroused situations, you need to find out the net force acting on an object, angle between the two force directions, acceleration, etc.

Module 2: Some Particular Forces

The second Resnick Halliday module contains 4 questions in which you need to find out the magnitude and direction of forces.

Module 3: Applying Newton’s Laws

The module has 51 questions that test your understanding of the three laws of newton. These questions possess a variety of situations that check if you can find the appropriate magnitude of the force or acceleration, the direction of force, constant deceleration, and the speed with which an object hits the ground.