friction: The resistance an object meets when moving over a surface or through a gas or liquid; it is the force that resists the motion of two surfaces that are touching each other.

Inertia is the tendency of an object to resist changes in its state of motion. Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity – and (in the absence of an unbalanced force) will remain with a zero velocity.

Explanation: The pen will be always in rest…even in movement also.. there will be no forces in the movement of the pen..

One is tension force that acts on the string and the other one is gravitational force that is acting on the pen and is therefore, the one that pulls the pen towards the ground. Therefore, the pen’s motion is caused by the unbalanced force acting on the pen.

Answer. yes, while the pen at rest the string provide force on pen this force is called a tension force.

In physics, rest and motion are two different states of a body. A body is said to be at rest if its position does not change with respect to its surroundings. Whereas, when the position of a body changes with respect to its surroundings, it is said to be in motion.

In the world of mechanics, there are four basic types of motion. These four are rotary, oscillating, linear and reciprocating. Each one moves in a slightly different way and each type of achieved using different mechanical means that help us understand linear motion and motion control.

Movement of any object from one position to another position with respect to the observer is called as Motion. Motion Along a Straight Line: When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway.

Rest and Motion Definitions Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.

The different types of motion are :

• Translatory motion.
• Rotatory motion.
• Oscillatory motion.
• Vibratory motion.
• Periodic motion.
• Multiple motion.
• Random motion. Answer verified by Toppr. Related questions.

Types of Motion

• Rectilinear motion,
• Circular motion,
• Periodic motion and.
• Rotational motion.

Explanation: The state of motion of an object is described by its speed and the direction of motion. The state of rest is considered to be the state of zero speed. An object may be at rest or in motion; both are its states of motion.

If the force applied on the object is in the direction of its motion, the speed of the object increases. If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object. Thus, a force may bring a change in the state of motion of an object.

Motion may be divided into three basic types — translational, rotational, and oscillatory.

This is also known as the law of inertia. Inertia is the tendency of an object to remain at rest or remain in motion.

The state of motion of an object is described by its speed and the direction of motion. For a body having zero speed, the state of motion is rest. For a body having a constant speed, the state of motion is uniform motion. For a body having variable speed and (or) direction, the state of motion is non-uniform motion.

A force is any push or pull that causes an object to move, stop, or change speed or direction. The greater the force, the greater the change in motion will be. The more massive an object, the less effect a given force will have on the object. Energy may exist in two states: kinetic or potential.

Action-at-a-Distance Forces

• Applied Force.
• Gravitational Force.
• Normal Force.
• Frictional Force.
• Air Resistance Force.
• Tension Force.
• Spring Force.

forces: forces applied to an object in opposite directions that are not equal in size. Unbalanced forces result in a change in motion.

Examples of unbalanced forces

• Kicking a soccer ball.
• The up and down movement in a seesaw.
• The taking-off of a Rocket.
• Skiing along the mountain slopes.
• Hitting a baseball.
• A turning vehicle.
• Drowning of an object.
• Apple falling on the ground.

Examples of balanced forces:

• The weight of an object and the normal force acting on a body are balanced.
• A car that is pushed from opposite sides with equal force.
• A lizard on a wall in a vertical position.
• A ball hanging by a rope.
• A weighing balance where the weight in both of the pans is exactly equal.

In science, a force is a push or a pull. All forces have two properties: direction and magnitude.

Why doesn’t it move? (Although two forces are acting on the chair, they are balanced. The force of gravity is pulling down on the chair. But since the chair is not moving, there must be an equal force in the opposite direction–the floor is pushing back up.

Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay.

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.

Friction is a resistive force that prevents two objects from sliding freely against each other. The coefficient of friction (fr) is a number that is the ratio of the resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together.

Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases.