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  1. AP Physics 1 Revised
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What is impulse?

The effect of a force acting over a time interval; a 'push' that changes momentum. Mathematically, it's the integral of force with respect to time: J⃗=∫t1t2F⃗net (t)dt\vec{J}=\int_{t_{1}}^{t_{2}} \vec{F}_{\text {net }}(t) d tJ=∫t1​t2​​Fnet ​(t)dt

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What is impulse?

The effect of a force acting over a time interval; a 'push' that changes momentum. Mathematically, it's the integral of force with respect to time: J⃗=∫t1t2F⃗net (t)dt\vec{J}=\int_{t_{1}}^{t_{2}} \vec{F}_{\text {net }}(t) d tJ=∫t1​t2​​Fnet ​(t)dt

Define momentum.

Momentum is a measure of mass in motion; it is a vector quantity defined as the product of an object's mass and its velocity: p⃗=mv⃗\vec{p} = m\vec{v}p​=mv

What is the impulse-momentum theorem?

The impulse-momentum theorem states that the impulse applied to an object is equal to the change in its momentum: J⃗=Δp⃗\vec{J} = \Delta \vec{p}J=Δp​

What is net external force?

The vector sum of all forces acting on a system from outside the system. It dictates how quickly the momentum of the system changes.

What is change in momentum?

The difference between the final momentum and the initial momentum of an object: Δp⃗=p⃗−p⃗0\Delta \vec{p}=\vec{p}-\vec{p}_{0}Δp​=p​−p​0​

What is the definition of Impulse (J)?

Impulse (J) is the average force (F_avg) applied over a specific time interval (Δt): J = F_avg * Δt

What is the definition of Momentum (p)?

Momentum (p) is the product of an object's mass (m) and its velocity (v): p = mv

What is the definition of Change in Momentum (Δp)?

Change in Momentum (Δp) is the difference between the final momentum (p) and the initial momentum (p₀): Δp = p - p₀

What is the definition of Net External Force (F_net)?

Net External Force (F_net) is the vector sum of all forces acting on an object or system.

What is the Impulse-Momentum Theorem?

The Impulse-Momentum Theorem states that the impulse acting on an object is equal to the change in momentum of that object: J = Δp

What happens when a net external force acts on an object?

The object's momentum changes.

What is the effect of applying a large force over a short time interval?

A large impulse is delivered to the object.

What happens to an object's momentum if the impulse acting on it is zero?

The object's momentum remains constant.

What is the effect of increasing the time over which a force is applied?

The impulse increases, leading to a greater change in momentum.

What happens when a car brakes?

The impulse from the brakes changes the car's momentum, causing it to slow down.