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Jul 28, 2023 · The SI unit for momentum is kgˑm/s. The cgs unit is gˑcm/s. Its dimensional formula is [M 1 L 1 T -1]. Momentum is a quantity involving the motion of an object. Objects with greater mass naturally have high momentum, but this will also depend on velocity. Suppose a car and a truck move on the highway with the same velocity.
The animation below portrays the inelastic collision between a 1000-kg car and a 3000-kg truck. The before- and after-collision velocities and momentum are shown in the data tables. In the collision between the truck and the car, total system momentum is conserved.
At a stoplight, a large truck (3000 kg) collides with a motionless small car (1200 kg). The truck comes to an instantaneous stop; the car slides straight ahead, coming to a stop after sliding 10 meters.
Energy is a key principle in physics, as it allows work to be done. The rate at which energy is transferred is called power and the amount of energy that is usefully transferred is called...
Momentum can be calculated using the equation: momentum = mass × velocity. \ (p = m~v\) This is when: momentum (p) is measured in kilogram metres per second (kg m/s) mass (m) is measured in ...
It also covers an example of using conservation of momentum to solve a problem involving an inelastic collision between a car with constant velocity and a stationary truck. Note that Sal accidentally gives the unit for impulse as Joules; it is actually N ⋅ ⋅ s or k ⋅ ⋅ gm/s.
Learn about and revise thinking distances, braking distances and how to calculate vehicle stopping distances with GCSE Bitesize Physics.