Balanced and Unbalanced Forces in Physics
Balanced and Unbalanced Forces
How do balanced and unbalanced forces affect an object's motion?
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What is inertia?
•
In science, a force is a
push
or a
pull
.
•
All forces have two properties:
Direction
and
Size
•
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at
describes the
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of a force.
What is a force?
•
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pushing
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chair does not move.
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chair.
What is a force
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Combining Forces
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Forces in the Same Direction
•
When two forces act in
opposite
directions, you
subtract the
smaller
force from the
larger
force
to determine the net force.
•
The net force will be in the same
direction
as
the
larger
force.
Forces in Different Directions
•
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Balanced Forces
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Unbalanced Forces
350 N
Net Force ____________
Let’s Practice!
ç
200 N
Net Force: _______________
Let’s Practice
75 N
150 N
75 N
Net Force _________________
Let’s Practice
10 N
30 N
10 N
Net Force: __________
Let’s Practice
We will look at three examples
of forces:
-
Friction
-
Gravity
-
Magnets
Exploring Forces
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Friction
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Friction
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Examples:
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Types of Friction
Static friction
occurs when
force
applied
to an object does
not
cause the object to
move
.
Types of Friction
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Ex) Motor oil, wax, and grease
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Reducing Friction
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Increasing Friction
-
How does friction affect an object’s
movement?
-
How can friction be beneficial?
-
How can friction be a problem?
-
Which stations demonstrated friction at
work?
Discuss!
Gravity is the force of
attraction
between
matter.
Gravity depends on:
mass
and
distance
Gravity
The
more massive
an
object the more it can
attract
objects to itself.
For example, the Sun has a
larger gravitational effect
than the Earth.
Mass and Gravity
The
further
away
objects get
from one another,
the
less
gravitational
attraction can be
found.
Distance and Gravity
-
How does gravity affect an object’s
motion?
-
Is gravity balanced, unbalanced, or both?
Give evidence to support your answer.
-
Was gravity at play in any of the
stations?
Discuss!
A
magnet
is an object with
a north and south pole that
produces a
magnetic field
and exerts a
magnetic
force
.
Magnets
A
magnetic field
is the force field that
surrounds the magnet.
A
magnetic force
can cause objects to
attract
or
repel
without needing to touch
the magnet!
Magnets
Like
poles will repel
or move
away
from
one another.
Opposite
poles will
attract
or move
towards one another.
Poles
A
compass
uses the
Earth’s magnetic field and
magnets to help a person
determine direction. The
magnet’s poles will line up
with the Earth’s north
magnetic pole and south
magnetic pole.
Compass
-
How do magnets affect an object’s
motion?
-
What happens to an object's motion
if no forces are acting on it?
Discuss!
Forces play a crucial role in determining an object's motion. Balanced forces have a net force of 0 N, resulting in no change in motion, while unbalanced forces lead to a change in motion. Inertia, the resistance to changes in motion, and the concept of combining forces are also important in understanding how objects move. Practice questions further reinforce these concepts.
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Presentation Transcript
Balanced and Unbalanced Forces How do balanced and unbalanced forces affect an object's motion?
What is inertia? Inertia is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. Inertia tells us the we need a force to get an object to move or stop an object from moving.
What is a force? In science, a force is a push or a pull. All forces have two properties: Direction and Size A newton (N) is the unit that describes the size of a force.
What is a force The student is pushing down on the chair, but the chair does not move. The floor is balancing the force by pushing on the chair.
Combining Forces More than one force often acts on an object. When all the forces acting on an object are added together, you determine the net force on the object. An object with a net force more than 0 N on it will change its state of motion.
Forces in the Same Direction When forces are applied in the same direction, they are added to determine the size of the net force.
Forces in Different Directions When two forces act in opposite directions, you subtract the smaller force from the larger force to determine the net force. The net force will be in the same direction as the larger force.
Balanced Forces When the forces on an object produce a net force of 0 N, the forces are balanced. There is no change in the motion of the object.
Unbalanced Forces When the net force on an object is not 0 N, the forces on the object are unbalanced. Unbalanced forces produce a change in motion of an object.
Lets Practice! 350 N Net Force ____________
Lets Practice 200 N
Lets Practice 75 N 150 N 75 N Net Force _________________
Lets Practice 10 N 30 N
Exploring Forces We will look at three examples of forces: - Friction - Gravity - Magnets
Friction Friction is the force that opposes the motion between two surfaces that touch. The surface of any object is rough. Even an object that feels smooth is covered with tiny hills and valleys. The contact between the hills of valleys of two surfaces causes them to stick, resulting in friction.
Friction The amount of friction depends on: Roughness of the surfaces Force pushing the surfaces together
Types of Friction Kinetic friction occurs when force is applied to an object and the object moves. Examples: Sliding Friction: pushing an object across a surface Rolling Friction: between wheels and a surface Fluid Friction: opposes the motion of objects traveling through a fluid (air or water)
Types of Friction Static friction occurs when force applied to an object does not cause the object to move.
Reducing Friction To reduce the amount of friction, apply a lubricant between two surfaces. Ex) Motor oil, wax, and grease Friction can also be reduced by rolling, rather than pushing, an object.
Increasing Friction Friction increases when the surface area of an object increases. Friction increases as surfaces are made rougher. Friction increases when the force between two objects increases.
Discuss! - How does friction affect an object s movement? - How can friction be beneficial? - How can friction be a problem? - Which stations demonstrated friction at work?
Gravity Gravity is the force of attraction between matter. Gravity depends on: mass and distance
Mass and Gravity The more massive an object the more it can attract objects to itself. For example, the Sun has a larger gravitational effect than the Earth.
Distance and Gravity The further away objects get from one another, the less gravitational attraction can be found.
Discuss! - How does gravity affect an object s motion? - Is gravity balanced, unbalanced, or both? Give evidence to support your answer. - Was gravity at play in any of the stations?
Magnets A magnet is an object with a north and south pole that produces a magnetic field and exerts a magnetic force.
Magnets A magnetic field is the force field that surrounds the magnet. A magnetic force can cause objects to attract or repel without needing to touch the magnet!
Poles Like poles will repel or move away from one another. Opposite poles will attract or move towards one another.
Compass A compass uses the Earth s magnetic field and magnets to help a person determine direction. The magnet s poles will line up with the Earth s north magnetic pole and south magnetic pole.
Discuss! - How do magnets affect an object s motion? - What happens to an object's motion if no forces are acting on it?
