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Impulse - A Level Physics Definition

Reviewed by: Leander Oates

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What is impulse?

In A Level Physics, impulse refers to the change in momentum of an object when a force is applied over a specific time interval. Impulse is a vector quantity with both magnitude and direction.

Impulse can be calculated using the following equation:

Impulse space equals space F increment t

Where:

  • Impulse is measured in newton seconds (N s)

  • F = resultant external force applied, measured in newtons (N)

  • increment t = change in time over which the force acts, measured in seconds (s)

Impulse is equal to the change in momentum of the object.

Understanding impulse is crucial for analysing situations involving collisions and force-time interactions in mechanics.

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Leander Oates

Reviewer: Leander Oates

Expertise: Senior Physics Content Creator

Leander graduated with First-class honours in Science and Education from Sheffield Hallam University. She won the prestigious Lord Robert Winston Solomon Lipson Prize in recognition of her dedication to science and teaching excellence. After teaching and tutoring both science and maths students, Leander now brings this passion for helping young people reach their potential to her work at SME.

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