Force and motion

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Force and motion

Types of Motion

Rest/Motion

Oscilatory

Rotary

Circular

Centrifugal force

Projectile

Linear

Free fall

Curvilinear

Rectilinear

Rest = An objecr is at rest if it does not change its position with time

Motion = An objecr is in motion if it changes its position with time

Buoyancy - Buoyancy force in liquids

Density tells us if the object floats or sinks.

Buoyancy less than weight = sinks

Buoyancy equal to weight = hover

Buoyancy more than weight = float

Who discovered buoyancy? = Achimedes

When an object is placed in a fluid, the fluid exerts an upward force we call the buoyant force.Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top.

Newton's Laws of Motion

Third Law - Action Reaction

Every force has an equal and opposite reaction force.

Second Law - F=ma

Force is proportional to mass times acceleration.

First Law - Inertia

Object tend to stay in the same position.

Moment of Force

Class of Levers

There are three types or classes of levers, according to where the load and effort are located with respect to the fulcrum. Class 1 has the fulcrum placed between the effort and load, Class 2 has the load in-between the effort and the fulcrum, and Class 3 has the effort between the load and the fulcrum.

What is a moment? = The Moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis.

Moment = Force x Distance or M = (F)(d)

Types of friction

Different types of motion of the object gives rise to different types of friction. Generally, there are 4 types of friction. They are static friction, sliding friction, rolling friction, and fluid friction.

Advantages of friction force

Heat

Noise

Slow down movement

Disadvantages of friction force

Drive/Stop a car

Hold things

Walk/Write