Which of the following is a correct definition of *impulse* in physics?

Question

BlackTom AI · Accepted Answer

Here we examine the definition of impulse in physics and compare each option to the standard concept.
Option a: 'The rate of change of velocity' — This is the definition of acceleration, not impulse. Impulse involves a force applied over a time interval, whereas acceleration is the rate of change of velocity with respect to time. So this option misidentifies the quantity by confusing impulse with acceleration.
Option b: 'The energy stored in a moving object' — This describes kinetic energy, not impulse. Impulse is about momentum change caused by a force over time, while kinetic energy is a scalar measure of motion energy. The statement mixes energy with force-time interaction, which is incorrect.
Option c: 'The product of force and time over which it acts' — This matches the formal definition of impulse: impulse = force × time (integral of force over the time interval). It quantifies the total effect of a force acting during a passage of time and is equal to the change in momentum. This option aligns with Newtonian mechanics concepts.
Option d: 'The product of force and displacement' — This resembles a form of work (force × displacement) rather than impulse. Work measures energy transfer due to force along a displacement, not the momentum change caused by a force over time. Therefore, this option is incorrect.

SPH4U - Physics 12 (2025-26) - A

Which of the following is a correct definition of impulse in physics?

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