Impulse

Impulse is the change in an object's momentum caused by a force acting over a time interval. It equals the time integral of force and, for constant force, the product of force and duration.

Momentum: Momentum is the product of an object's mass and velocity, a vector quantity conserved in isolated systems. Impulse is defined by the change in this quantity.
Impulse force: An impulse force is a large force acting over a short time during an interaction. Such forces produce finite momentum changes despite their brief duration.
Newton (unit): The newton is the SI unit of force, equal to one kilogram metre per second squared. Multiplying force in newtons by time in seconds gives impulse in newton-seconds.
Work (physics): Work is energy transferred when a force acts through displacement. Work accumulates force over distance, whereas impulse accumulates force over time.
Impulse–momentum theorem: The impulse–momentum theorem states that net impulse equals the change in momentum. It states the precise relation that defines impulse.
Collision: A collision is an interaction in which objects exert forces on one another over a limited time. Each object's momentum change is determined by the impulse during contact.
Second: The second is the SI base unit of time. Impulse depends on how long the force acts.
Energy: Energy is a conserved physical quantity that can be transferred or transformed and is associated with the capacity to produce change. Impulse changes momentum; it is not an amount of energy.
Force: Force is an interaction that changes an object's motion or shape, described in classical mechanics by Newton's laws. The force acting over time supplies the impulse.
Airbag: An airbag is an inflatable vehicle safety device that cushions occupants during a crash. It lengthens the stopping time, reducing average force for a given momentum change.

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