A block slides along a rough table and is brought to rest...

Name: Problem 2, Chapter 2: Physics for the IB Diploma
Uploaded: 2021-01-12T06:33:29-08:00
Duration: 56 s
Channel: Khoobchandra Agrawal
Description: A block slides along a rough table and is brought to rest after travelling a distance of 2.4 m. The frictional force is assumed constant at 3.2 N. Calculate the work done by the frictional force.

A block slides along a rough table and is brought to rest after travelling a distance of 2.4 m. The frictional force is assumed constant at 3.2 N. Calculate the work done by the frictional force.

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Key Concepts

Work

Work in physics refers to the energy transferred to or from an object via the application of force along a displacement. It is calculated using the dot product of force and displacement, typically expressed as W = F * d * cos(?), where ? is the angle between the force and displacement vectors. This concept is fundamental to understanding energy transfer in mechanical systems.

Friction

Friction is a resistive force that opposes the relative motion between surfaces in contact. It converts kinetic energy into other forms such as heat, leading to energy dissipation. When friction acts on a moving object, it performs work, often reducing the object's kinetic energy as it overcomes the net displacement.

Negative Work

Negative work occurs when the force applied on an object has a component in the direction opposite to its displacement. In the context of friction, the frictional force acts against the motion, resulting in negative work being done. This negative work is responsible for decreasing the kinetic energy of the moving object.

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