A push or pull exerted on an object.
net force
force
gravity
air resistance
Can make an object fall into the ground slower
net force (opposite directions)
air resistance
Newton's first law
force
Book sitting still on a table, a boat floating, tug of war. What are these examples of?
Balanced forces
gravity
Newton's first law
unbalanced forces
A measure of the force of gravity on an object.
Gravity
Force
Weight
Friction
The push or pull that opposes motion between two surfaces that are touching each other.
Friction
Weight
Newton's First Law
Newton's third law
Do not change speed or direction.
Balanced forces
gravity
unbalanced forces
acceleration
For every action, there is an equal and opposite reaction.
Mass
Gravity
Newton's Third Law
Friction
When two forces act in opposite directions, the net force is the difference between them (subtract)
Net force (opposite directions)
air resistance
gravity
Examples of unbalanced forces
Ball rolling down a hill, car coming to a stop, dominoes falling. What are these an example of?
force
Newton's second law
unbalanced forces
net force (same direction)
The force by which a planet or other body draws objects toward its center.
Acceleration
Gravity
Unbalanced forces
Balanced Forces
The amount of matter in an object.
Mass
Weight
gravity
Newton's third law
If two (or more) forces act on an object in the same direction, the net force is the sum of the forces (add)
Air resistance
Net Force (same direction)
force
Net force (different direction)
An object's acceleration depends on its mass and on the net force acting on it (F=ma).
Force
Friction
Mass
Newton's Second Law
An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force.
Gravity
Examples of unbalanced forces
Force
Newton's First Law
Change in speed or direction; rate of change of velocity.
Unbalanced forces
Gravity
Balanced forces
Acceleration
Forces that cause a change in the motion of an object.
Acceleration
Inertia
Gravity
Unbalanced forces