force
DESCRIPTION
Force. A force is a push or a pull. The combination of all the forces acting on an object is the net force. PUSH. PULL. Force. Two or more forces exerted on an object are balanced forces if their effects cancel each other and they do not change the object’s velocity. - PowerPoint PPT PresentationTRANSCRIPT
Force• A force is a push or a
pull.• The combination of all the forces acting on an object is the net force.
PUSH PULL
Force• Two or more forces exerted on an object are balanced forces if
their effects cancel each other and they do not change the object’s
velocity.• If the forces on an object are balanced, the net force is zero.
Force====
Force
• If the net force is not zero, the forces are unbalanced forces.
Then the effects of the forces don’t cancel, and
the object’s velocity changes.
Force
Draw an example of both balanced and unbalanced forces on your paper.
Gravity
• Gravity is the force of attraction between all
masses in the universe.
Gravity• Depends on the mass of
the objects and the distance between them. • The gravitational force
becomes weaker the farther apart the
objects are and also decreases as the
masses of the objects involved decrease.
Weight• The weight of an object
is the size of the gravitational force
exerted on an object.
Friction• The force that brings nearly everything to a
stop is friction, which is the force that acts to resist sliding between
two touching surfaces.
Friction• Although several
different forms of friction exist, they all
have one thing in common. If two objects are in contact, frictional
forces try to prevent one object from sliding
on the other object.
Static Friction
• The type of friction that prevents an object from moving when a force is applied is called static
friction.
Sliding Friction
• Sliding friction slows
down an object that
slides.
Rolling Friction
• Rolling friction occurs when an object rolls
across a surface.