momentum - it is present in anything that moves, trajectory - the path an object follows, projectile - any object that once projected or dropped continues in motion by its own inertia and is influenced only by the downward force of gravity, speed - the time rate at which an object is moving along a path, velocity - speed with direction, range - horizontal distance traveled by an object , moon - Earth's natural satellite, impulse - a change in momentum, system - made up of any object each of which has mass and velocity, collision - impact, energy - ability to do work, kinetic - energy in motion, potential - stored energy, gravity - force that pulls us towards the center of Earth, sound - energy that is produced by vibrating bodies, nuclear - energy from fission reaction, heat - thermal energy, weight - gravitational potential energy, mass - quantity of matter in a physical body, rocket - used to launch artificial satellites or spacecraft ,

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