Zusammenfassung der Ressource
Forces
- A force is any influence that causes an
object to undergo a specific change.
- Thrust - increases
the velocity of an
object
- Air resistance -
decreases the velocity
of an object
- Torque - changes the
direction of an object
- Newton's First Law of Motion states that
objects with balanced forces
acting on them will stay at rest or
in constant motion.
- Newton discovered that objects
will continue to do what they
are doing until an unbalanced
force acts on the object.
- Forces act on objects
- Forces cause changes
- Newton's Second Law of Motion
states that when an unbalanced
force acts on an object...
- ...the direction of the
object's acceleration
is the same as the
direction of the
unbalanced force.
- ...the magnitude of
the object's
acceleration varies
in direct proportion
with the size of the
unbalanced force.
- ...the magnitude
of the object's
acceleration
varies inversely
with the mass of
the object.
- Friction is a force that
opposes motion and is
caused by two surfaces
sliding past each other.
- An object may have lots of forces
acting upon it, and they are added
together to create the resultant
force.
- If the resultant force
is zero, a moving
object will stay at the
same speed.
- If the resultant force is not
zero, a moving object will
speed up or slow down
depending on the direction of
the resultant force.