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Force and motion vocabulary words

This list is for middle school science students studying how objects move and interact. It covers core vocabulary from Newton's laws of motion, including terms for speed, friction, gravity, and the forces that start or stop movement.

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Force and motion vocabulary words

30 words
WordMeaningIn a sentenceSave
forcenounA push or pull that can change an object's motion or shape.The force from her hand set the toy car moving.
motionnounThe action or process of moving or being moved from one place or position to another.The sudden motion of the boat nearly knocked her off her feet.
velocitynounThe speed of something in a specific direction; the rate at which it moves.The rocket reached an incredible velocity just seconds after launch.
speednounThe rate at which someone or something moves or covers distance over time.The car reached a speed of over one hundred miles per hour on the highway.
accelerationnounThe rate at which the speed or velocity of something increases over time.The sports car's rapid acceleration pushed passengers back into their seats.
gravitynounThe attraction between objects that have mass.Gravity pulls the falling apple toward Earth.
frictionnounThe resistance one surface or object encounters when moving against another, or tension between people.Friction between the tires and the wet road made the car harder to control.
inertianounThe tendency of an object to remain still or keep moving unless a force acts on it.The physics teacher explained inertia using a coin balanced on a spinning card.
momentumnounThe force or drive that keeps a moving object or an ongoing process going, or the strength gained from progress.The campaign gained momentum after the candidate's speech went viral online.
massnounThe quantity of matter in an object, measured by its resistance to acceleration; also a large body or quantity of something.Scientists measured the mass of the asteroid using its gravitational pull.
weightnounThe measure of how heavy something is, resulting from the force of gravity acting on its mass.The suitcase exceeded the airline's weight limit by two kilograms.
thrustverbTo push something suddenly and forcefully in a particular direction.She thrust the umbrella into his hands and ran back inside.
dragverbTo pull something heavy along a surface with effort, or, informally, to move slowly and tediously.They had to drag the fallen branch off the road before traffic could pass.
magnetismnounThe physical force that attracts certain materials, such as iron, and repels others; also a person's compelling charm.The magnetism of the coil was strong enough to lift small metal pins.
equilibriumnounA state of balance between opposing forces, influences, or elements.The two negotiating teams eventually reached an equilibrium both sides could accept.
balancedadjectiveHaving different parts, forces, or elements in correct or fair proportion to one another.A balanced diet includes a healthy mix of proteins, vegetables, and whole grains.
unbalancedadjectiveLacking even balance or proportion, or, informally, mentally unstable.The unbalanced load made the washing machine shake violently during the spin cycle.
newtonnounThe standard unit of force, defined as the force needed to accelerate one kilogram by one meter per second squared.The engine produced a thrust of over one million newtons at liftoff.
vectornounA quantity that has both magnitude and direction, often represented by an arrow.The plane's velocity is a vector showing both its speed and its direction of travel.
directionnounThe course or line along which something moves, faces, or points.The compass showed we were traveling in the wrong direction.
distancenounThe amount of space between two points, places, or things.The distance between the two cities is about three hundred miles by road.
displacementnounThe act of moving something from its usual place or position, or forcing people from their homes.The flood caused the displacement of thousands of families along the river.
kineticadjectiveRelating to or resulting from motion.The sculpture used kinetic elements that moved gently whenever the wind blew.
potentialadjectivePossible but not yet actual; capable of developing into something in the future.Investors saw potential profit in the small startup's new technology.
energynounThe capacity to do work or bring about change.Sunlight provides energy that the plant uses to make sugars.
resistancenounThe act of opposing or fighting against something, or a force that slows or stops motion.The new policy met strong resistance from local business owners.
pushverbTo apply force to move something away, or to urge someone toward a particular action or goal.He pushed the heavy cart up the ramp toward the loading dock.
pullverbTo apply force to something in order to move it toward oneself or in a particular direction.He pulled the heavy sled across the snow toward the cabin.
trajectorynounThe curved path that a moving object follows through space, shaped by the forces acting on it.Scientists carefully calculated the trajectory of the rocket before its launch.
torquenounA twisting force that causes rotation around an axis.The wrench applies enough torque to loosen even a rusted bolt.

Newton's laws in plain words

Newton's laws of motion vocabulary describes how forces affect moving and resting objects. Inertia is an object's tendency to stay at rest or keep moving unless a force acts on it, while momentum describes how hard it is to stop something that is already moving. A balanced force produces no change in motion, but an unbalanced force causes an object to speed up, slow down, or change direction.

Frequently asked questions

What is the difference between speed and velocity?

Speed measures how fast something moves, while velocity includes both speed and the direction of motion.