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Gravity
A force of attraction between objects due to their masses.
Weight
A measure of the gravitational force exerted on an object.
Mass
The amount of matter in an object.
Gravitational Force
The force with which two objects attract each other, increasing with mass and decreasing with distance.
Newtons (N)
The SI unit of force, used to quantify weight.
Universal Gravitation
The law stating that all objects in the universe attract each other through gravitational force.
Force
A push or a pull that has both size and direction.
Balanced Forces
When the net force applied to an object is equal, resulting in no change in motion.
Unbalanced Forces
When the net force applied to an object is greater than zero, causing a change in motion.
Friction
A force that opposes motion, occurring when surfaces interact.
Mass
The amount of matter in an object.
Weight
A measure of the gravitational force exerted on an object, expressed in Newtons (N).
Velocity
Speed in a given direction.
Acceleration
The rate of change of velocity over time.
Net Force
The total force acting on an object when all individual forces are combined.
Motion
The action or process of moving or being moved.
Inertia
The tendency of an object to resist changes in its state of motion.
Kinetic Friction
The friction that occurs when an object is in motion.
Static Friction
The friction that resists the initiation of sliding motion between two surfaces.
Surface Area
The measure of how much exposed area an object has.
Newton's Third Law of Motion
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Equal and Opposite Forces
Action force and reaction force have the same size but act in opposite directions.
Momentum
A property of a moving object that depends on the object's mass and velocity.
Law of Conservation of Momentum
States that when two or more objects interact, they may exchange momentum, but the total amount of momentum stays the same.
Mass
The amount of matter in an object, which affects its momentum.
Speed
The rate at which an object moves.
Velocity
The rate an object moves in a particular direction.
SI unit for speed (international system of units)
m/s (meters per second).
Force
The SI unit for force is Newton (N).
Gravitational force
The force that makes us fall back down after jumping up.
Newton's First Law of Motion
An object at rest remains at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted upon by an unbalanced force.
Newton's Second Law of Motion
The acceleration of an object depends on the mass of the object and the amount of force applied, expressed as F = ma.
Acceleration
The rate of change of velocity of an object, which depends on the mass and the force applied.
Mass
The quantity of matter in an object, which together with the force affects the object's acceleration.
Unbalanced Force
A force that results in a change in motion of an object, opposing its inertia.
motion
An object's change in position over time compared with a reference point.
speed
The rate at which an object moves, depending on the distance traveled and the time taken to travel that distance.
acceleration
The rate at which velocity changes; an object accelerates if its speed changes, direction changes, or both change.
Force
A push or a pull that has size and direction.
True or False: All forces have size and direction.
True
True or False: A force is a push or a pull.
True
True or False: Forces are expressed in liters.
False
True or False: You can exert a push without there being an object to receive the push.
False
What are three examples of forces used during schoolwork?
Examples include pushing a pencil, pulling a binder, and sliding a book.
Note 
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