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Forces and Newton’s Laws. Tina R. Walters 2011. Forces. A push or a pull. What is a Net Force?. T he combination of all the forces on an object. Determines the motion of the object . Same Direction Add the forces together Opposite Directions The difference

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Forces and newton s laws

Forces and Newton’s Laws

Tina R. Walters

2011


Forces
Forces

A push or a pull


What is a net force
What is a Net Force?

  • The combination of all the forces on an object.

  • Determines the motion of the object.

  • Same Direction Add the forces

    together

  • Opposite Directions The difference

    between the 2 forces and in the

    directions of the larger force.


Forces1
Forces

Balanced

  • Cancel each other out

  • No motion

  • Net force equals zero

Unbalanced

  • Net Force is more than zero

  • Motion occurs


Newton s first law
Newton’s First Law

When the net force acting on an object is zero, the object will remain at rest. If the object is already in motion. It will continue to move in a straight line.


Friction
Friction

  • The force that acts to resist sliding between 2 touching surfaces.

  • Always slows a moving object.


Three types of friction
Three types of Friction

  • Static prevents an object from moving when force is applied.


Three types of friction1
Three types of Friction

  • Sliding slows down an object

    that is sliding

    Example: Brakes.


Three types of friction2
Three types of Friction

  • Rolling Friction Occurs between the ground and part of the tire touching the ground. Pushes bike forward


Newton s second law
Newton’s Second Law

An object acted on by a force will accelerate in the direction of the force.


Acceleration
Acceleration

Acceleration = net force (N)

(meters/second) mass (kg)


Acceleration1
Acceleration

a = Fnet

m

Forces are measured in newton

N = kg-m/s2


Gravity
Gravity

  • Pulls objects towards each other

  • Depends on the mass of an object and the distance between them.


Weight
Weight

Gravitational forces between you and the Earth.


Weight vs mass
Weight vs. Mass

  • A force

  • Measured in Newtons

  • Varies with location.

  • Amount of matter in a object

  • Measured in Kg.

  • Stays the same


Air resistance
Air Resistance

  • Form of friction

  • Gets larger as an object moves faster

  • Depends on the shape of an object.


Center of mass
Center of Mass

Point in an object that moves as if all the object’s mass were concentrated at that point.


Newton s third law
Newton’s Third Law

For every action there is an equal but opposite reaction.

Action-Reaction Pairs don’t cancel each other


Thrust
Thrust

A force that lifts rockets


Free fall
Free Fall

Only force acting on an object is gravity.


Weightlessness
Weightlessness

Occurs in a free fall when the weight of an object seems to be zero.


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