Physics holiday homework
Applications of Newton’s laws of motion

Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. They have been expressed in several different ways over nearly three centuries, and can be summarized as follows: 1- The first law states that an object continues in its state of rest or uniform motion in a straight line unless compelled by an external unbalanced force. Since law defines inertia, it is also known as the law of inertia. 2- The second law states that the rate of change of momentum of an object is proportional to the frce applied and moves in the direction of force. 3- The third law states that every action has an equal and opposite reaction and acts on different bodies. Applications of Newton’s laws of motion

Newton’s first law of motion
1- Seat bleats exert force on our body to make the forward motion slower. An opposite experience is encountered when we are standing in a bus or a train and the it moves suddenly. We tend to fall backwards. This because the sudden start of the bus brings motion to the bus as well as to our feet in contact.

2- When a motor car makes a sharp turn at a high speed, we tend to slip or thrown to one side. Newton’s second law of motion
1-a cricket player pulls back his hands to catch a fast moving ball. In doing so, the fielder increases the time during which the high velocity of the ball decreases to zero and thus, the fielder does not get hurt.
2-in a high jump athlete events, the atheists are made to jump on a cushion bed or on a sand bed. Newton’s third law of motion
1- When a bullet is fired from a gun, the force sending the bullet forward is equal to the force the gun backwards. This is because every action has an equal and opposite reaction.

...Force & Motion
Isaac Newton – English physicist & mathematician.
Newton’s First Law of Motion(Law of Inertia):
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalance force.
An object at rest tends to remain at rest. An object in motion tends to move at a constant speed in a straight line unless acted upon by an unbalanced externalforce.
Newton’s Second Law of Motion(Law of Acceleration):
An object’s acceleration is directly proportional to the net force acting on it and is inversely proportional to the object’s mass.
Newton’s Third Law of Motion(Law of Interaction):
For every action, there is always an equal and opposite reaction.
Force is any interaction which tends to change the motion of an object. It can also be described by intuitive concepts such as a push or pull.
Unbalanced Forces
An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.
Direct proportion- means that when one factor increases, the other factor also increases and vice versa.
Inverse proportion- means that when one factor increases, the other factor decreases.
Acceleration- increase in the rate or speed of something....

...What is Force?
In physics, a force is any influence that causes an object to undergo a certain change, either concerning its movement, direction, or geometrical construction. It is measured with the SI unit of newtons and represented by the symbol F. In other words, a force is that which can cause an object with mass to change its velocity(which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity.
The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.[1] If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional the mass of the object. As a formula, this is expressed as:
where the arrows imply a vector quantity possessing both magnitude and direction.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object....

...Chapter 2
Forces
To study the effect of forces acting on particles.
2.1 Equilibrium of a Particle
2.2 Free Body Diagram
2.3 Force Vectors
2.4 Forces in a Plane
2.5 Forces in Space
Expected Outcomes
• Understand the condition for a particle to be in static
equilibrium
• Able to construct free body diagrams
• Able to solve for the forces acting on a static particle
2.1
Equilibrium
of a Particle
www.classical.com/features
2.1.1 Condition for the
Equilibrium of a Particle
• Particle is at equilibrium if it is
a) At rest
b) Moving at constant a constant velocity
2.1.1 Condition for the Equilibrium
of a Particle
(a) Equilibrium at rest
• Newton’s first law of motion
∑F = 0
where ∑F is the vector sum of all the forces acting on the
particle
Even Univ.
Graduates
(a) Equilibrium at rest
• Newton’s Law of
Motion
• 1st law – a particle
originally at rest, or
moving in a straight
line with constant
velocity, tends to
remain in its state
provided the particle
is not subjected to an
unbalanced force.
http://www.jameslogancourier.org/index.php?blogid=1&archive=2006-3-21
2.1.1 Condition for the
Equilibrium of a Particle
(b) Equilibrium at motion
• Newton’s second law of motion
∑F = ma
• When the force fulfill Newton's first law of motion,
ma = 0
a=0
therefore, the particle is moving in...

...For other uses, see Force (disambiguation).
Page semi-protected
See also: Forcing (disambiguation)
ForceForce examples.svg
Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate.
Common symbol(s): F, F
in SI base quantities: 1 kg·m/s2
SI unit: newton
Derivations from other quantities: F = m a
Classical mechanics
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In physics, a force is any influence that causes an object to undergo a certain change, either concerning its movement, direction, or geometrical construction. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or a flexible object to deform, or both. Force can also be described by intuitive concepts such as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.
The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.[1] If the mass of...

...Definition of Force
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces onlyexist as a result of an interaction.
Velocity, Acceleration, Momentum, and Impulse
Velocity, in physics, is a vector quantity (it has both magnitude and direction), and is the time rate of change of position (of an object). However, quite often when you read ‘velocity’, what is meant is speed, the magnitude of the velocity vector (speed is a scalar quantity, it has only magnitude). For example: escape velocity (the minimum speed an object needs to escape from a planet, say); note that this can be easily turned into a velocity, by adding ‘in the direction radially out from the center of the planet’, and that this direction is sometimes implied (if not actually stated).
Velocity is a vector measurement of the rate and direction of motion or, in other terms, the rate and direction of the change in the position of an object. The scalar (absolute value) magnitude of the velocity vector is the speed of the motion. In calculus terms, velocity is the first derivative of position with respect to time.
The most common way to calculate the constant velocity of an object moving in a straight line is with...

...Module EG1083 Fluid Mechanics
PRESSURE , FLUID SYSTEMS and FLUID PRESSURES
SM(1)
Pressure
Definition of Pressure
Fluid pressure: Force per unit area exerted by a fluid in a solid wall. Force acts perpendicularly to the surface in contacts. Fluid is a co u d s common word for gas a d/o liquid. o od o and/or qu d Pressure is a scalar quantity. It has the units of: N/m2 or Pa (or kPa) in SI system of units psi in Imperial system of units Pressure can also be expressed in terms of height of a column of liquid List of units of pressure measurements & conversion of units Pascal s Pascal’s law
Scalar quantity
Units of Pressure
SM(2)
PressurePressure measurements Absolute pressure Gauge Pressure
...divided into three different categories: 1. Absolute pressure – which is defined as the absolute value o pressure (force-per-unit-area) ac g o of p essu e ( o ce pe u a ea) acting on a surface by a fluid. su ace ud Abs. pressure = pressure at a local point of the surface due to fluid – absolute zero of pressure (see page 63 of lecture notes) 2. Gauge pressure – difference between abs. pressure and atmospheric pressure – is...

...Physics notes
Force is an agent which produces or tends to produce motion in an object, stops or tends to stop , motion of an object
Newton's 1st law of motion:
If an object is at rest, will remain at rest until or unless an external force act on it. If an object is in motion , it continues its motion until or unless an external force act on it
Newton's 1st law of motion is also called first law of inertia.
Inertia:
The tendency of an object to resist any change in its state of motion or rest is called inertia.
Inertia is the measure of mass in an object.
Heavier object are difficult to bring in motion or in rest because they've greater inertia.
Newton's 2nd law of motion:
Force produces acceleration in an object in its own direction. The acceleration is directly proportional to the force and inversely proportional of the mass of the object.
Resultant force is unbalanced force.
F=ma , where F is the resultant force.
Q: the mass of a boy n his bicycle is 30kg, wants to accelerate at 1.5per sec square if the opposing force is acting on both is 40N
Find the force needed for this acceleration.
Q2: a car of weight 50,000N is moving with a uniform speed of 20meters per sec
The opposing force is acting on the car is 600N
Find:
a: the force applied by the engine
b: if the engine...

...
FORCE AND MOTION
Ronald Steven DuBois
5th Grade
St. Michael's Catholic School
2009
TABLE OF CONTENTS
1. Abstract
2. Introduction
3. Background Information
4. Procedure
6. Data and Observations
7. Results
8. Conclusion
9. Bibliography
ABSTRACT
I thought it would be fun to fling things like raw eggs and rocks with a catapult. Guess
what, it was! By flinging these items I tried to find out if heavier things would travel farther than
lighter ones. Basically how force effects motion.
With the catapult as the force, I sent items soaring, after weighing them, and then
recorded how far the items travelled. This showed me how Newtons Three Laws of Motion
work.
Force causes change is Newton's First Law of Motion which I saw from the catapult
flinging the items.
My hypothesis that heavier items would go farther was not correct, because Newton's
Second Law of Motion says that the force applied is equal to mass times acceleration. For
instance, if you push a skateboard it will roll away, but if you push a car with the same amount
of force, it will barely move. So heavier items do not travel farther.
Newton's Third Law of Motion is that for every action there is an equal and opposite
reaction. In my experiements this is shown clearly by the...

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