1. Definition Of Forces In Physics
2. Distant Force Definition
3. Distant Forces
4. Distant Force Pdf
5. Air Force Distance Learning

In physics, time is defined as the fundamental quantity. Force is an interaction that change the motion of the object. Distance is the measure of how far away an object is. The below is the simple online Force time distance calculator to find the time, force and distance. Select the required unit from the drop-down menu in the force calculator and fill the values to find between time/force/distance. As Power calculator needs three inputs for computing like time calculator.

Force Calculator | Power Calculator

In physics, time is defined as the fundamental quantity. Force is an interaction that change the motion of the object. Distance is the measure of how far away an object is. The below is the simple online Force time distance calculator to find the time, force and distance. Select the required unit from the drop-down menu in the force calculator and fill the values to find between time/force/distance. As Power calculator needs three inputs for computing like time calculator.

Distance, Velocity, Momentum, Force, Pressure, Work and Energy Distance, Speed and Acceleration distance: x is measured in units of m, for meters. Position: r, a vector in three dimensions described by a distance and a direction. 4.0 out of 5 stars Tele = Distant, Dyne = Force Reviewed in the United States on August 28, 2016 I bought and read this book in an attempt to better understand Henry Singleton, a now lesser known yet incredibly astute businessman in his time. Distant Force by George A. Roberts, 2007, Teledyne Corporation edition, Hardcover in English - 1st edition. In physics, time is defined as the fundamental quantity. Force is an interaction that change the motion of the object. Distance is the measure of how far away an object is. The below is the simple online Force time distance calculator to find the time, force and distance. Distant Worlds is a real-time grand strategy wargame developed by Code Force and published by Matrix Games. Distant Worlds was released on March 25, 2010. Three subsequent expansions, Return of the Shakturi, Legends, and Shadows were released in 2010, 2011, and 2013, respectively. The game appeared on the Steam platform on May 23, 2014 under the name Distant Worlds: Universe, gathering the.

Example:

Find time when force is 60 N, distance is 15 m and power 30 watts?

Solution:

Time = 60 × 15 / 30
= 30 s

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Impact forces acts on falling objects hitting ground, crashing cars and similar

The dynamic kinetic energy of a moving object, like a falling ball or a driving car, can be expressed as

E = 1/2 m v² (1)

where

E = kinetic (dynamic) energy (J, ft lb)

m = mass of the object (kg, slugs)

v = velocity of the object (m/s, ft/s)

In an impact - like a car crash - the work made by the impact force slowing down an moving object over a distance by deforming the crumple zone can be expressed as

W = F_avg s (2)

where

W = work done (J, ft lb)

F_avg = average impact force during deformation (N, lb_f)

s = deformation distance, crumple zone (m, ft)

When a crumple zone deforms in a car crash the average impact force is designed to be as constant as possible.

In an impact where the object is not deformed - the work made by the impact force slowing down the moving object equals to the work done by a spring force - and can be expressed as

W = 1/2 F_max s

= 1/2 k s² (2b)

where

W = work done (J, ft lb)

F_max = maximum force at the end of the deformation (N, lb_f)

Definition Of Forces In Physics

k = spring constant

s = deformation distance (m, ft)

Distant Force Definition

In a car crash the dynamic energy is converted to work and equation 1 and 2 can be combined to

F_avg s = 1/2 m v² (3)

The average impact force can be calculated as

F_avg = 1/2 m v² / s (3b)

The deformation slow-down distance can be calculated as

s = 1/2 m v² / F_avg (3c)

Note! - The deformation slow-down distance is very important and the key to limit the forces acting on passengers in a car crash.

Example - Car Crash

A car with a mass of 2000 kg drives with speed 60 km/h (16.7 m/s) before it crashes into a massive concrete wall. The front of the car impacts 0.5 m (the deformation distance).

The impact force can be calculated as

F_max = 1/2 (2000 kg) (16.7 m/s)² / (0.5 m)

= 558 kN

Note that the gravitation force (weight) acting on the car is only

F_w = m g

= (2000 kg) (9.81 m/s²)

= 19.6 kN

The impact creates a force 28 times gravity!!

A person sitting inside the car with seat belts on will de-accelerate with a force 28 times gravity. Note that the National Highway Traffic Safety Administration (NHTSA) states that 'the maximum chest acceleration shall not exceed 60 times gravity for time periods longer than 3 milliseconds'. For a car crash with 90 km/h (25 m/s) the de-acceleration will be 64 times gravity (same parameters as above).

• 60 mph = 96.6 km/h

Impact Force from a Falling Object

The dynamic energy in a falling object at the impact moment when it hits the ground can be calculated as

E = F_weight h

= m a_g h (4)

where

F_weight = force due to gravity - or weight (N, lb_f)

a_g = acceleration of gravity (9.81 m/s², 32.17405 ft/s²)

h = falling height (m)

If the dynamic energy from the fall is converted to impact work - equation 2 and 4 can be combined to

Distant Forces

F_avg s = m a_g h (5)

The impact force can be expressed as

F_avg = m a_g h / s (5b)

The deformation slow-down distance can be expressed as

s = m a_g h / F_avg (5c)

Example - a Falling Car

The same car as above falls from height 14.2 m and crashes on the crumple zone with the front down on a massive concrete tarmac. The front impacts 0.5 m (slow down distance) as above. The impact force can be calculated as

F_avg = (2000 kg) (9.81 m/s²) (14.2 m) / (0.5 m)

= 558 kN

Note! - a car crash in 90 km/h (25 m/s) compares to a fall from 32 m!!

Example - a Person falling from a Table

A person with weight (gravitational force) of 200 lbs (lb_f) falls from a 4 feet high table.

The energy of the falling body when it hits the ground can be calculated using (4) as

Distant Force Pdf

E = (200 lb_f) (4 ft)

= 800 ft lb

The impact on a human body can be difficult to determine since it depends on how the body hits the ground - which part of the body, the angle of the body and/or if hands are used to protect the body and so on.

For this example we use an impact distance of 3/4 inch (0.0625 ft) to calculate the impact force:

F_avg = (800 ft lb) / (0.0625 ft)

= 12800 lb_f

In metric units - person with weight 90 kg, falling distance 1.2 m and impact distance 2 cm:

E = (90 kg) (9.81 m/s²) (1.2 m)

= 1059 J

F_avg = (1059 J) / (0.02 m)

= 53 kN

Air Force Distance Learning

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• Dynamics - Motion - velocity and acceleration, forces and torques

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