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# Newton's Laws of Motion

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## Leena Abu-Zahra

on 20 February 2013

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#### Transcript of Newton's Laws of Motion

Newton's Laws of Motion Newton's First law of motion: Law of Inertia Part I- Objects at Rest:
Will remain at rest unless acted upon by an unbalanced force
Ex: a soccer ball at rest wouldn't start moving if it wasn't acted upon by another force (push or pull) Part II- Objects in Motion
Will continue to move in the same direction and constant velocity unless another unbalanced force acts upon it Friction and Newton's First Law
Friction acts as an unbalanced force to stop objects from moving forever
Ex: if you push an alphabet toy, friction acts between the toy and the ground, which eventually makes the toy stop moving
Ex: Tubing- if your handle or feet were dragging on the snow, you would go slower and stop faster Inertia and Newton's First Law
Inertia allows objects to resist motion, or resist a change in speed or direction
Because of this, objects at rest will remain at rest unless acted upon by another force Mass and Inertia
More mass=More inertia
The more mass an object has, the more force is needed to move the object and the harder it is to stop an object
Ex: it is easier to start pushing an empty box versus a box with books in it
Ex: Tubing- Inertia makes it harder to start and stop a heavier tube than a lighter one. More force would be needed Newton's Second Law of Motion:
Law of Acceleration Part I- Acceleration Depends on Mass
acceleration decreases as mass increases
Ex: this is why the box with books accelerates slower than the empty box Part II- Acceleration Depends on Force
the acceleration of an object is always in the same direction as the greater force applied
acceleration increases as force increases
Ex: the stroller will accelerate faster if more force is applied Mathematics-
a=F/m
F=ma Newton's Third Law of Motion:
Law of Conservation of Momentum Pairs-
all forces act in pairs
whenever there is an action force, there is a reaction force that is equal in size but opposite in direction
Ex: Newton's Cradle- The action force is the first ball hitting the second ball and transferring the momentum on. The reaction force is the second ball making the first ball stop moving. Pairs of Forces Don't Act on the Same Object-
action and reaction forces don't act on the same object
the net force would be 0 N if they did (no movement) Gravity and Newton's Third Law-
a falling soccer ball:
gravity pulls the ball towards Earth, and the Earth towards the ball
because the pull of Earth towards the ball is so small (Earth's mass is huge), the ball falls to the ground Air resistance and falling objects relate to the action and reaction forces. If a piece of flat paper is dropped, the action is the paper falling due to gravity, and the reaction is the air resistance pushing the paper back up. This causes a crumpled paper to fall to the ground before a flat paper. Newton's first law about objects in motion explains how objects can be in free fall. Objects in free fall remain at a constant acceleration and direction because only gravity is acting upon it. Another unbalanced force would be needed to take the object out of free fall. Also, the first law explains why a spacecraft in outer space orbits Earth instead of moving in a straight path. The reason the spacecraft would orbit Earth is because gravity and centripetal force are acting upon it. These forces cause the spacecraft to follow a curved path instead of a straight path. By: Isaac, Leena, and Freddy The End Action: gravitational pull of ball
towards Earth Reaction: gravitational pull of Earth
towards the ball Air Resistance Velocity Downward An object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and in a straight line unless acted on by an unbalanced force. The acceleration of an object depends on the mass of an object and the amount of force applied. Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. The first law relates to:
Horizontal and Vertical Motion
Free Fall
Velocity of Falling Objects
Orbiting and Centripetal Force
Acceleration Due to Gravity The second law relates to:
Gravity and Acceleration
The third law relates to:
Terminal Velocity
Air Resistance and Falling Objects
Projectile Motion
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