Newton's Laws Of Motion & Forces

Newton's Third Law

For every action, there is an equal and opposite reaction.

Newton's Third Law (LONG)

For every action, there is an equal and opposite reaction.

Mass

The amount of matter in an object

Acceleration

The change in speed over time

zero

The direction of a moving object will not change if the net force acting on it is

weight (definition)

The downward force on an object due to gravity.

Newton's Second law

The larger an objects mass the more force it will take to accelerate or slow down (F = m x a)

Sir Isaac Newton

The man who discovered the Laws of Motion

Inertia

The tendency of an object to resist any change in motion

Inertia (definition)

The tendency of an object to resist any change in motion

Action-Reaction

Third Law of Motion is the law of?

Newtons(N)

This unit can be used to express force

Balanced Forces

Unchanged Inertia

Newtons (N)

Unit of force

A net force of 3N to the right

What does this picture show

Newton's third law

What does this picture show

50 N

What if the force needed by the man to accelerate the car 0.05 m/s2 if there is no friction?

980 N

What is the weight of a 100kg object if gravity is pulling it down on the floor

5000 N

What must be the force on an 1000kg object to accelerate it 5 m/s/s

5000N = 1000kg x 2 m/s2

What must be the force on an 1000kg object to accelerate it 5 m/s2

Conservation of momentum

always conserved in collisions

Law of Interia

an object at rest and an object in motion will continue unless an unbalance force acts upon it. (other meaning)

unbalanced forces

applied force is not the same as the net force

Force

A push or a pull resulting from the interaction of an object

True

A 10-kg object has greater acceleration due to gravity than a 5-kg object. T or F

60 kg m/s

A 20-kg object moving at a velocity of 3 m/s has a momentum

Gravity

A force that always attracts or pulls objects toward each other without direct contact or impact

Gravity Force

A force that always attracts or pulls objects toward each other without direct contact or impact

Friction

A force that opposes or slows down motion

Unbalanced Forces

ALWAYS cause a change in motion. They are NOT equal in size, but ARE opposite in direction.

Gravity (definition)

Accelerating force of attraction between any 2 objects in the universe

Newton's Second Law

Acceleration is produced when a force acts on a mass.

Newton's Third Law

Action-Reaction

Newton's Third Law (SHORT)

Action-Reaction

For every action there is...

An equal and opposite reaction

Newton's First Law

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 unbalanced force.

Newton's First Law

An object at rest stays at rest until a force causes it to move or An object in motion stays in motion until a force causes it to stop or change direction

Newton's First Law

An object at rest will remain at rest and an object in motion will remain in motion, unless acted on by an unbalanced force. Also called the "Law of inertia"

unless acted upon by an unbalances force

An object at rest will stay at rest

Momentum

Another name for Newton's 2nd Law of Motion

Newton's Second Law (formula)

F=ma

Fw = mg

Specialized formula for weight

Law of Inertia

First Law of Motion (other name)

Yes, if you are moving at a constant velocity( like cruise control )

Can you be moving and not be accelerating

Unbalanced Net Force

Change in Inertia

Zero Forces

DO NOT cause a change in motion. They are EQUAL in size and ARE opposite in direction.

Third Law - for every action there is an equal and opposite reaction

Equal and opposite forces acting on an object related to which of Newton's laws?

Balanced forces

Equal forces acting in opposite directions causing no change in motion

action-reaction

Force always acts in pairs

1st and 2nd Laws are about...

Forces acting on the same object

Aristotle

Greek scientist who studied motion. His idea was 2 divided into two kinds- natural motion and violent motion

More momentum while moving

Have larger mass

Less momentum while moving

Have smaller mass

The greater the mass the greater the weight

How is the weight of an object related to its mass?

F=ma

If a force is applied to an object it will accelerate (formula)

15 m/s/s

If a force of 1500N is applied to an 100kg object neglecting friction what is the acceleration of the object

15 m/s2

If a force of 1500N is applied to an 100kg object neglecting friction what is the acceleration of the object

3.50kg x 9.8m/s2= 490 N

If an object has a mass of 50 kg, what is its weight?

They are balanced

If an object is not moving what can we say about the forces acting on it

doubles

If you double the mass of a moving object, the object's momentum

have an unbalanced force acting on it or net force

In order for an object to accelerate it must

Objects will smaller masses have

Less Inertia

Objects with larger masses have

More Inertia

inertia

Newton's first law of motion is also called the law of

False

Newton's first law of motion is also called the law of acceleration

its mass and the net force applied to it

Newton's second law of motion relates an object's acceleration to

Force applied to the object

Newton's second law of motion shows that there is a direct relationship between acceleration and

Force is measured in

Newtons (N)

1 m/s2

One newton is the force needed to cause a 1-kilogram mass to accelerate at

equal and opposite

When an action force occurs, the reaction force is always

10 kg...10 kg x 2m/s = 20kg m/s

Which object has more momentum a mass of 1 kg mass moving at 10m/s verses an object with mass 10kg moving at 2 m/s.

Balanced force

Zero Force

Greater mass means

_____________object has greater momentum if moving

Force (definition)

a push or pull on an object; measured in Newtons (N)

g = 9.8 m/s/s

acceleration due to gravity

g= 9.8 m/s2

acceleration due to gravity

Weight

changes with different gravitational forces

Newton's third Law

for every action there is and equal and opposite reaction

Unbalanced forces

forces not equal in size that cause the motion or direction of an object to change

force divided by mass

formula for acceleration

w = mg

formula for weight in Newton's

Objects with smaller masses have

less inertia

momentum

mass times velocity

terminal velocity

maximum velocity of a falling object

acceleration

occurs whenever an object is acted upon by an unbalanced force.

Forces always exist in ..

pairs

mass

remains constant always, everywhere

Overcoming an objects inertia requires

requires a net force greater than zero

Newton's First Law Of Motion is also called

the "Law of inertia"

net force

the sum of all forces acing on an object.

Newtons

this unit can be used to express force

Newtons or kg m/s2

this unit can be used to express force

acceleration (definition)

when an object changes velocity or direction or both