A steady stream of projectiles, with identical linear momenta, collides with a fixed target. The average force on the target is proportional to *

The average force on the target is proportional to:

- The number of projectiles hitting the target.

- The mass of the projectiles.

- If the time increases or decreases

Explanation:

This is a problem that applies momentum and the amount of movement. Where this principle can be explained by the following equation:

m*v1 + Imp1_2 = m*v2

where:

∑F *Δt = Imp1_2 = impulse. [N*s]

m*v1  = mass by velocity before the impact [kg*m/s]

m*v2  = mass by velocity after the impact [kg*m/s]

When a problem includes two or more particles, each particle it can be considered separately and equation is written for every particle.

We clear the expression of force in the equation:

∑F *Δt  = m*v2 - m*v1

In this equation if we have a different number of particles, given by the value n, we see that the equation is proportional to the number of particles

∑F *Δt  = n*m*v2 - n*m*v1

Therefore the average force on the target is proportional to the number of projectiles hitting the target.

The Force F is also increased or decreased if the mass of the projectiles is changed. Therefore it is also proportional to the mass of the projectiles.

The Force F also changes if the time increases or decreases.

magnityde and direction

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.