cause
an event or process that leads to a result or change
collision
the moment when two objects hit each other
effect
a result or change that happens because of an event or process
equal
the same in quantity, size, degree, or value
exert
to apply a force
force
a push or a pull that can change the motion of an object
friction
a force between an object and the surface it is moving over
infer
to reach a conclusion using evidence and reasoning
kinetic energy
the energy that an object has because it is moving
mass
the amount of matter that makes up an object
matter
anything that has mass and takes up space
opposite
acting or going in the reverse direction
pod
a self-contained unit on an aircraft, spacecraft, vehicle, or vessel that can be detached for a particular function
speed
how fast an object is moving
velocity
speed in a particular direction