What is the formula for momentum?
Linear momentum (momentum for brevity) is defined as the product of a system’s mass multiplied by its velocity. In symbols, linear momentum p is defined to be p = mv, where m is the mass of the system and v is its velocity. The SI unit for momentum is kg · m/s.
Which motion does not require force to maintain it?
The correct answer is – Uniform straight line motion. Uniform motion is the kind of motion in which a body covers equal distances in equal intervals of time.
What is difference between momentum and velocity?
In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. The equation illustrates that momentum is directly proportional to an object’s mass and directly proportional to the object’s velocity. The units for momentum would be mass units times velocity units.
Why do we need inertia?
In an upcoming IE Questions, we’ll tackle why inertia is an essential part of of making sure electricity is there when you need it. Inertia is one of the most basic concepts of physics. Essentially, things that are moving will keep moving unless a force – like friction – causes them to stop.
What affects a bullet in flight?
There are many important pieces that factor into the understanding of bullet trajectories: air resistance, angle, air pressure and temperature, muzzle velocity, bullet shape and drag coefficient. All of these factors contribute to the accuracy of the bullet hitting the desired target.
Why do projectiles drift?
Because of the curvature of the trajectory, air pressure on the underside of the nose of the projectile causes a precession to the right. This shift of the projectile axis to the right increases the air pressure on the left-hand side of the nose, which causes the projectile to precess downward.
What are the markings on a bullet called?
The marks or striations on each bullet match, indicating that the two bullets were fired from the same weapon. Since a gun will also leave unique marks on cartridge cases, cases left at crime scenes can link a suspect’s weapon to the crime.
Can you trace a bullet to a gun?
The theory behind firearm identification is that microscopic striations and impressions left on bullets and cartridge cases are unique, reproducible, and therefore, like “ballistic fingerprints” that can be used to identify a gun. A fired bullet with rifling impressions from the barrel of a gun (left).