Force and Motion

force

a pull or push that is applied to an object

inertia

an object's resistance to a change in motion

mass

the amount of matter in an object

matter

material that has mass and takes up some amount of space

motion

a change in the position of an object compared to another object (related term: move, movement)

acceleration

a change in the velocity (speed, direction, or both) of a body (related word: accelerate)

action

movement; something that happens (related words: move, moving)

attract

to pull towards; opposite poles of a magnet come together when they attract each other (related word: attraction)

drag

resistance by friction from air or water moving over a surface

friction

a force that opposes the motion of a body across a surface or through a gas or liquid

resist

to push or act against: Something that resists a force pushes against that force.

speed

distance traveled per unit of time

thrust

a reaction force that pushes an object forward

gravity

a force that exists between any two objects that have mass (related word: gravitational)

surface

he top of an object; the outside of an object; the boundary between two objects or materials

weight

the force of gravity on an object