2) Impulse = Ft. where F is the force and t is the length of time the force acts. A rifle recoils (moves back in the opposite direction) from firing a bullet. Impulse of Force. What is impulse equal to? Impulse can be an important quantity when youâre solving physics problems because you can relate impulse to momentum, and you must work with momentum to â¦ The impulse experienced by a body is equivalent to the body's change in {eq}\rule{0.5in}{0.3pt} {/eq}. Note that this is a vector equation because the force has a direction; therefore the impulse does as well. This is also equal to the magnitude of the force multiplied by the length of time the force is applied. From Newton's second law. b. the change in volume of an object. Said another way, we replace the value of "t" in the function f(t) by the value of "t" that makes the argument of the impulse equal to 0 (in this case, t=Î»). is a measure of the efficacy of rocket propellants. The equation for impulse derives from Newton's second law of motion: F = (Îp)/ (Î t) â Î p = F Î t Îp is the change of momentum, which is referred to as "impulse". The product of average force and the time it is exerted is called the impulse of force. is equal to exhaust velocity and has the SI unit of meter per second. c. a force applied to an object for a period of time. This is called the "sifting" property because the impulse function d(t-Î») sifts through the function f(t) and pulls out the value f(Î»). Correct answers: 2 question: - An impulse is equivalent to a. the change in mass of an object. It is correct to say impulse is equal to (a) the change in momentum (b) momentum (c) the force multiplied by the distance the force acts (d) all the above (e) none (b) less than the speed of the bullet. When there is a collision between two objects, Newton's Third Law states that the force on one of the bodies is equal and opposite to the force on the other body. I think this question can be answered by combining the equations for impulse and work done. if defined as impulse per mass (or thrust per mass flow rate) . When an object has a momentum , and a force is applied for an amount of time, the momentum can change to a new value .The impulse-momentum theorem states that the impulse is equal to this change in momentum. The impulse of a force is equal to the force times the length of time the force acts i.e. Î p = (W Î t) / d Where Îp is the impulse and W is the work done. From the previous section, you have seen that Newtons Second Law can be summed up by the formula F = ma. Impulse = Ft. 1. When a net force acts on a body, it accelerates in the direction of the force. Related Questions. Q: A spoon which looks bent is â¦ the impulse of force can be extracted and found to be equal to the change in momentum of an object provided the mass is constant: Impulse is a vector quantity whose direction is that of the force. 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