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OHVA Physical Science Sem 1 Unit 2: Forces & Motion
S1 U2 Physical Science Forces & Motion
15
Science
9th Grade
08/07/2025

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Term
acceleration
Definition
rate of change in velocity, which is the change in velocity divided by the change in time
Term
electromagnetic force
Definition
attractive or repulsive force acting between charged particles
Term
force
Definition
a push or pull; any quantity that produces, or is capable of producing, motion. In the second law of motion it is equal to Mass x Acceleration. The ability to apply a change in velocity on a given object.
Term
friction
Definition
force of resistance acting between objects in contact and tending to dampen their motion; A force that resists all motion.
Term
gravity
Definition
force of attraction between all masses in the universe; an attractive force between any 2 objects due to mass.
Term
inertia
Definition
an object´s resistance to a change in motion
Term
mass
Definition
the amount of matter an object is made up of and the measure of the amount of inertia (resistance to change in momentum) the object has, measured in grams
Term
momentum
Definition
an object´s resistance to its motion changing: the object´s mass times the object´s velocity
Term
newton
Definition
the unit of FORCE in the metric system (SI); it is a unit derived from mass and acceleration (speed over time in a direction)
Term
speed
Definition
the rate at which an object changes position; distance divided by time
Term
velocity
Definition
the rate at which an object changes position when traveling in a certain direction, expressed as a rate: distance divided by time + direction
Term
Newton's First Law
Definition
A law of motion that states that an object at rest stays at rest and one in motion stays in motion.
Term
Newton's Second Law
Definition
This says the acceleration of an object increases by force applied to it, and decreases based on its mass.
Term
Newton's Third Law
Definition
Fore every action, there is an equal and opposite reaction.
Term
unbalanced forces
Definition
This is what causes acceleration. Two forces acting opposite each other.
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