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NEWTON’S LAW OF MOTION
Isaac Newton through the 3 laws of motion summarized the reasons why object moves, stop, or keep on
moving
These laws are the center of the study called dynamic of motion
Dynamic
- Is a branch of physics that deals with the study of why objects moves the way they do. Why
some moves fast, or slow
KEY WORDS
Intertia- is related to mass and is measured by an object’s mass. Tendency of the object to keep doing
what it is doing
Net Force- sum of all the forces felt by the system
Equilibrium- in balance; net force is zero
1
ST
LAW OF MOTION: LAW OF INERTIA
- Newton’s first law states that all objects will remain at rest, of will continue to move at a
constant speed in the same direction unless acted upon by an unbalanced force. This property is
called inertia.
Example: a man in a motorcycle moving in a constant speed and direction. If there is no brick that blocks
the way the tendency for the motorcycle and the man is to continue or keep moving in the same
direction with the constant speed. The presence of the brick is the presence of an unbalanced force. So
when an unbalanced force is applied to an object it causes the object to change its state of motion.
Example: a box at rest. The box at rest will forever be at rest unless you applied force on it. When you
put a pushing force or unbalanced force on the object it can now trigger the change in the state of the
motion in the box. So from being at rest, it will now start moving
NET FORCE
- Also known as the unbalanced force and it is the sum of all forces felt by the object. It is the
unbalanced force that causes the change in the state of motion of an object either at rest or in
motion. It is the main cause why objects change their state of motion from being either at rest
or in motion.
- There are two concepts
If there is a net force acting on an object, it will cause a change on its state of motion
If there is no net force acting on an object, its current state of motion will be unchanged
forever
2
ND
LAW OF MOTION: LAW OF ACCELERATION
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- Newton’s second law states that unbalanced forces cause an object to move. This can be stated
mathematically by the formula: a= f/m where a is the acceleration in meter per second squred, f
is the force in newton, and m is the mass in kilogram
3
RD
LAW OF MOTION: LAW OF INTERACTION
- Newton’s third law of motion stated that for every action there is an equal and opposite
reaction. It can be easily understood by the idea that when object 1 exerts a force on object 2,
the object 2 exerts back the same amount of force on object 1. When an object exerts a force on
another object, the second object exerts back the same amount of force.
Remember about the 3
RD
law of motion
1. It always involve two objects
2. It always involve two forces. Object 1 exerting force on object 2 and object 2 exerting the force
back on object 1
3. These two forces occur simultaneously, they occur at the same time so when object 1 exerts
force on object 2, automatically object two will exert the force back to object 1
4. The magnitude of these two forces are equal so they have the same magnitude. If object 1
exerted a force of 10N on object 2 then object 2 will exert back the 10N
5. The two forces are acting on an opposite direction. The two forces are called counterforces
3
rd
law of motion: examples
- To understand it easier, forces always come in pair
- See the video in
FRICTIONAL FORCE
-it is a contact force that slows down the object or prevents motion. Always parallel to the surface in
contact and in opposite direction of the motion.
The object is in direct contact with the surface and It is moving to the right. To be able to know the
friction, we just need to draw a parallel or along the surface. So if the direction of the motion is to the
right then the direction of the friction is to the left. Because its goal is to resist the motion or to slow
down the motion
Remember that the rougher the surface the more frictional the object felt the smoother the surface is,
the lesser the friction
KIND OF FRICTION- kinetic and static
KINETIC FRICTION-
Frictional force that exists when the object is in motion and it is drawn parallel surface opposite the
direction of the motion because it resists the motion
STATIC FRICTION-
- Stationary or not moving
- A friction force that exists when an object is at rest.
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- This frictional force prevents the object from sliding

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NEWTON’S LAW OF MOTION Isaac Newton through the 3 laws of motion summarized the reasons why object moves, stop, or keep on moving These laws are the center of the study called dynamic of motion Dynamic - Is a branch of physics that deals with the study of why objects moves the way they do. Why some moves fast, or slow KEY WORDS Intertia- is related to mass and is measured by an object’s mass. Tendency of the object to keep doing what it is doing Net Force- sum of all the forces felt by the system Equilibrium- in balance; net force is zero 1ST LAW OF MOTION: LAW OF INERTIA - Newton’s first law states that all objects will remain at rest, of will continue to move at a constant speed in the same direction unless acted upon by an unbalanced force. This property is called inertia. Example: a man in a motorcycle moving in a constant speed and direction. If there is no brick that blocks the way the tendency for the motorcycle and the man is to continue or keep moving in the same direction with the constant speed. The presence of the brick is the presence of an unbalanced force. So when an unbalanced force is applied to an object it causes the object to change its state of motion. Example: a box at rest. The box at rest will forever be at rest unless you applied force on it. When you put a pushing force or unbalanced force on the object it can now trigger the change in the state of the motion in the box. So from being at rest, it will now start moving NET FORCE - - Also known as the unbalanced force and it is the sum of all forces felt by the object. It is the unbalanced force that causes the change in the state of motion of an object either at rest or in motion. It is the main cause why objects change their state of motion from being either at rest or in motion. There are two concepts ➢ If there is a net force acting on an object, it will cause a change on its state of motion ➢ If there is no net force acting on an object, its current state of motion will be unchanged forever 2ND LAW OF MOTION: LAW OF ACCELERATION - Newton’s second law states that unbalanced forces cause an object to move. This can be stated mathematically by the formula: a= f/m where a is the acceleration in meter per second squred, f is the force in newton, and m is the mass in kilogram 3RD LAW OF MOTION: LAW OF INTERACTION - Newton’s third law of motion stated that for every action there is an equal and opposite reaction. It can be easily understood by the idea that when object 1 exerts a force on object 2, the object 2 exerts back the same amount of force on object 1. When an object exerts a force on another object, the second object exerts back the same amount of force. Remember about the 3RD law of motion 1. It always involve two objects 2. It always involve two forces. Object 1 exerting force on object 2 and object 2 exerting the force back on object 1 3. These two forces occur simultaneously, they occur at the same time so when object 1 exerts force on object 2, automatically object two will exert the force back to object 1 4. The magnitude of these two forces are equal so they have the same magnitude. If object 1 exerted a force of 10N on object 2 then object 2 will exert back the 10N 5. The two forces are acting on an opposite direction. The two forces are called counterforces 3rd law of motion: examples - To understand it easier, forces always come in pair See the video in FRICTIONAL FORCE -it is a contact force that slows down the object or prevents motion. Always parallel to the surface in contact and in opposite direction of the motion. The object is in direct contact with the surface and It is moving to the right. To be able to know the friction, we just need to draw a parallel or along the surface. So if the direction of the motion is to the right then the direction of the friction is to the left. Because its goal is to resist the motion or to slow down the motion Remember that the rougher the surface the more frictional the object felt the smoother the surface is, the lesser the friction KIND OF FRICTION- kinetic and static KINETIC FRICTIONFrictional force that exists when the object is in motion and it is drawn parallel surface opposite the direction of the motion because it resists the motion STATIC FRICTION- Stationary or not moving A friction force that exists when an object is at rest. - This frictional force prevents the object from sliding Name: Description: ...
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