Concept — The total momentum of an isolated system is conserved.
Featured in chapters
05·06·07
Linked atoms
69 linked atoms.
02 Forces and Newton’s laws
05 Momentum and collisions
- Child jumping onto the cart
- Cart and person running
- Conservation of momentum
- Conservation and change of reference frame
- Derivation of a 1D elastic collision
- Hockey pucks
- Worked example — collision through a spring
- Worked example — explosion into two fragments
- Worked example — 1D elastic collision
- Worked example — partially inelastic collision
- Explosions
- Huygens and the laws of collisions
- Newton’s cradle
- The two parallel tables
- Mass that halves
- Ballistic pendulum (height)
- Ballistic pendulum (speed)
- Why is momentum conserved?
- Problem — 2D explosion with three fragments
- Problem — Jumping out of the window
- Momentum: the principle before the law
- Staged rocket
- Rocket in a vacuum
- Cannon recoil
- Recoil of a pistol
- Recoil on ice
- Fermi estimate, mass of the projectile
- Broken third law
- Types of collision: elastic, inelastic, perfectly inelastic
- Three bodies in cascade
- Perpendicular 2D collision
- Inelastic truck–car collision
- Collision with a spring in three phases
- Elastic collision in 1D
- Elastic collision between two marbles
- True or false (impulse and collisions)
- True or false on collisions
- Towards the centre of mass
06 Centre of mass
- Two blocks with a spring and the CM graph
- Elastic versus perfectly inelastic
- Explosion and total momentum
- Fantaphysics: instantaneously variable mass
- Fantaphysics: third law broken
- The boy walking on the boat
- The velocity of the centre of mass
- Reading the CM position graph
- Person walking on the boat
- Person on the boat
- Water-bottle rocket
- Rocket and the Tsiolkovsky equation
- Rocket in deep space
- Recoil of a rifle
- Challenge: simultaneous three-body collision
- Elastic collision in 1D
- Collision between sledges
- Perfectly inelastic collision
- True or false on the centre of mass
07 Rotational dynamics
- Case 3: elastic collision with a free rod on a rail
- Conservation in two dimensions
- Problem — 2D elastic collision on a billiard table
- Summary of the conservation laws
08 Universal gravitation
13 Coulomb’s force and electrostatics
- Two conservation laws together
- The centre of mass ignores internal forces
- Problem — Two charges launched upwards
- Problem — Two charges released from rest
- Problem — The two gunslingers