The # of motor units determines the amount of strength brought to a particular action.…
1. Design an algorithm that prompts the user to enter his or her height and stores the user’s input in a variable named height.…
The main points for manual handling should be avoided as far as reasonably practicable and when unavoidable, and by putting the reduce risk of injury to the possible level. The risk assessment will be the highlight by using the hoists and mechanical lifting devices to reduce the incidence of musculoskeletal injuries in staff.…
Nifty Lifting Machine Use complete sentences to answer the questions. What simple machines did you incorporate into you nifty lifting machine? The simple machines that I incorporated into my nifty lifting machine was a pulley and a lever. The pulley was used to help lift up the weight.…
Equipment; If you were in a care home for elderly people and they couldn’t use their legs or get up from sitting down you would have to use a hoist to help them up which is more time consuming, but it is against the law to drag lift them onto their feet. Therefore that is why staff have to use hoists, if a member of staff wanted to use the hoist to help someone up and it was broken this would be poor maintained and this could result in injury.…
You may have watched the popular show Ninja Warrior only to wonder how these people get so fit and how on earth did they get those muscles. If you do watch the show you probably already know that many of these athletes are rock climbers, and there is a reason for this.…
Honestly, it truly is the easiest way to generate fit and healthy condition with the help of Fitness scale. It genuinely saves your time and energy as you don't need to visit such places like gyms and many types of same centres. You need to simply spear hardly 1 minute to have a look! Put them anywhere you need. Put them inside you bathroom, drawing room, mattress room, anywhere you would like. You'll find various fitness beam scales vary with assorted functions within it. But, digital fitness scales tend to be popular available on the market for precise and are really simple to read. The simplest…
Bionic leg prostheses are motor powered artificial limbs that are enabling amputees to pursue fully mobile lifestyles. Most of today’s leg prostheses are passive and require a lot of energy to use, this makes them more of a hindrance than a help on people’s lives. Conventional leg prostheses consist of spring structures that store and release elastic energy through each walking stance period and cannot generate more mechanical energy than that is stored during each step, this leads to 10-60% more required energy and 11-40% slower walking speeds (S. K. A, M. B, and H. M. H, 2008). On the contrary active bionic leg prostheses output a significant amount of energy to lift the person during movement, and are capable of adapting automatically to variation in walking velocities and terrain, much like the human leg.…
Deterioration of muscular strength has been implicated in the decline in productive work performance of industrial workers who must repeatedly lift heavy objects. Muscular endurance, however, has proven more difficult to assess. A 1991 study found that 80 percent of workers on disability in Holland were older than age 50, with nearly a third of cases due to musculoskeletal disorders. It is not surprising, therefore, that as workers employed for heavy physical labor get significantly older, their productivity declines.…
have nothing but a sink, a toilet, their bed, and a few square feet of…
Kinematics flourished in the 19th century as machine inventors learned to transmit information and forces (power) from one element in the machine to another. Steam- and water-based machines revolutionized the l9th century, but both of those energy sources generate circular motions, creating the need to convert these steady circular motions into nonsteady linear and curvilinear motion for machine applications. Practical inventors as well as mathematicians [Artobolevskii 1964] took up the challenge to create input-output kinematic devices that could convert circular motion into noncircular, complex, three-dimensional, intermittent motions. Thousands of mechanisms were invented, designed, and built, nurturing the widespread use and manufacture of machines. Reuleaux set out to codify, analyze, and synthesize kinematic mechanisms so that engineers could approach machine design in a rational way. He laid the foundation for a…
The debate between free weights and weight machines has been around as long as the machines themselves. From body builders to stay-at-home moms trying to stay in shape, the great debate has been fueled by the fact that there is no ‘one size fits all’ method. Individuals are encouraged to find the method that works for them. There are many angles from which this argument may be examined such as cost, safety, effective muscle workout, and medical effects of continuous use. People should use free weights instead of weight machines because they are less expensive, versatile and work more muscle groups simultaneously than weight machines.…
A person with mass, m, who is located at or near the surface of the Earth will always have some weight W=mg. When a person stands on a scale, the reading (the number of pounds or newtons) on the scale is actually the Normal Force that the scale exerts back towards the person to support the person's weight. (Note that the person and the scale are stationary relative to each other, in other words they are always in contact with each other, so they always have equal and opposite action and reaction forces acting between them.) Things get complicated, though, when the scale and the person experience acceleration. This will change the contact force (the Normal Force) between the person and the scale. Let's look at several cases. We will assume that Up is the positive direction and Down is the negative direction. Case 1: No acceleration of elevator If the acceleration of the elevator is zero, then there are two possible scenarios; the elevator can be at rest (stationary, zero velocity) or moving with a constant speed (no acceleration if velocity does not change). In this case, the action and reaction force pair between the person and the scale is just the weight. The person pushes down on the scale with a force of -W=-mg (negative direction) and the scale pushes back up against the man with a Normal Force of FN = +W = +mg. Because the reading on the scale is the magnitude of the normal force, the scale will read the true weight when the elevator is NOT accelerating. Case 2: going up & speeding up (acceleration a is positive (up)) In this case, the elevator and the person are starting from rest at a lower floor. The elevator accelerates upward. The inertia of the person would prefer to stay stationary, so the elevator floor and scale must push up on the person to accelerate him upward along with the elevator. (The person doesn't sink into the floor when the elevator accelerates up. The elevator and the scale and the person all…
Though there are many types of elevators, the most common type is the roped elevator. This type of system consists of many parts to hold the circuit together, but the main components are the electric motor, guide rails, counterweight, sheave, and the control system. With all of these parts, an elevator is considered to be a machine because of its pulleys and action of changing direction or magnitude of a force. The ropes are attached to the elevator car, and looped around a sheave(3). A sheave is just a pulley with a grooves around the circumference. The sheave grips the hoist ropes, so when you rotate the sheave, the ropes move too. The sheave is connected to an electric motor(2). When the motor turns one way, the sheave raises the elevator; when the motor turns the other way, the sheave lowers the elevator.Typically, the sheave, the motor and the control system(1) are all housed in a machine room above the elevator shaft.The ropes that lift the car are also connected to a counterweight (4), which hangs on the other side of the sheave. The counterweight weighs about the same as the car filled to 40-percent capacity. In other words, when the car is 40 percent full (an average amount), the counterweight and the car are perfectly balanced. Both the elevator car and the counterweight ride on guide rails(5) along the sides of the elevator shaft. The rails keep the car and counterweight from swaying back and forth, and they also work with the safety system to stop the car in an emergency. These five components not…
Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. Ideally, the device preserves the input power and simply trades off forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever. Machine components designed to manage forces and movement in this way are called mechanisms. An ideal mechanism transmits power without adding to or subtracting from it. This means the ideal mechanism does not include a power source, and is frictionless and constructed from rigid bodies that do not deflect or wear. The performance of a real system relative to this ideal is expressed in terms of efficiency factors that take into account friction, deformation and wear.…