How Is the Impulsive Force Calculated During a Mobile Phone's Impact?

• depre87
In summary, the conversation discusses a mobile phone being dropped from a height of 1.5m onto a hard floor. The mass of the phone is 0.2 kg and it bounces to a maximum height of 50 mm. The phone is estimated to be in contact with the floor for 0.005s. The question is asking for the average value of the impulsive force during the impact, which is calculated using the equation F dt = dP. The solution involves calculating the velocities using conservation of energy, but the incorrect answer was obtained because the signs of the velocities were not taken into account. The correct answer is 257 N.
depre87

Homework Statement

Mobile phone is dropped onto a hard floor from a height of 1.5m. The mass of the mobile phone is 0.2 kg. After the impact, the phone bounces to a maximum height of 50 mm. The phone is estimated to be in contact with the floor for 0.005s. Which is of the following is the closest to the average value of the impulsive force during the impact?

F dt = dP
dP = mv1 - mv0

The Attempt at a Solution

so what i basically tried to do was calculate v1 and v0 then can find F but the answer is supposed to be 257 N where as I am getting ~177N
so i calculated the velocities using conservation of energy and found v0 to be 5.42 m/s and v1 to be 0.99 m/s and then rearrange to solve for F.

You did not take the sign of the velocities into account.

ehild

oh wow I am so silly... thankyou so much!

What is impulsive force during impact?

Impulsive force during impact is the force that occurs when two objects collide or come into contact with each other. It is the force that causes a change in the motion of an object.

How is impulsive force during impact calculated?

Impulsive force during impact is calculated by multiplying the mass of the object by its change in velocity. This is known as the impulse-momentum theorem.

What factors affect the magnitude of impulsive force during impact?

The factors that affect the magnitude of impulsive force during impact include the mass and velocity of the objects involved, as well as the duration of the impact.

What are some real-life examples of impulsive force during impact?

Some real-life examples of impulsive force during impact include car accidents, sports collisions, and a ball hitting a bat or racket.

How does impulsive force during impact relate to Newton's Third Law of Motion?

Impulsive force during impact is closely related to Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. This means that the force exerted by one object on another during impact is equal in magnitude but opposite in direction.

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