FORCES

A force

A push, pull or twist

Contact Forces

applied, friction, tensional, air resistance and spring.

Applied Force

pushing a box across the floor

Frictional Force

Sliding on the floor

Tensional Force

Pulling on a lead

Normal Force

The opposite of gravity/ the upward force

Air Resistance Force

Sky diving

What are free body diagrams used for?

To show the relative magnitude and direction of all forces acting upon an object in a given situation

What do free body diagrams show?

All forces acting upon an object in a given situation

balanced forces

Equal forces acting on an object in opposite directions
AN OBJECT NOT MOVING STAYS STILL

unbalanced forces

A moving object will accelerate or decelerate

Simple machines

that changes the magnitude or direction of a force

Pulley

A simple machine that consists of a rope that fits into a groove in a wheel

Spring Force

A pen pushing down to get the pen out.

non-contact forces

gravity, electrical, magnetic

Gravity

Weight force

Electrical Force

Like charges repel and opposites attract. BALLON AND WATER.

Magnetic Force

the attraction or repulsion between magnetic poles

Weight

is a forced produced by gravity acting on an object.

Arrows

Used to show a vector quantity

lever

a simple machine that consists of a bar that pivots at a fixed point called a fulcrum

wedge

A device that is thick at one end and tapers to a thin edge at the other end.

inclined plane

a flat, sloped surface

What is a screw?

A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral

Work

Work = force x distance

Scissors

1st class lever

seesaw

1st class lever

nut cracker

2nd class lever

wheelbarrow

2nd class lever

tweezers

3rd class lever

stapler

3rd class lever

Fulcrum

The support or turning point of a lever

Load

the object to be moved

Effort

the applied force acting on a lever

MA

Load x effort

Archemedes Principle

The buoyant force is equal to the weight of the displaced water.

static friction

a friction force that acts on objects that are not moving

kinetic friction

Friction between moving surfaces

Newtons 1st law

An object will stay in motion or in rest unless acted upon by a unbalanced force.

Newtons 2nd law

Force = mass x acceleration

Newtons 3rd law

For every action there is an equal and opposite reaction

Velocity

the speed of something with direction.