LABORATORY REPORT Activity: Recruitment and Isotonic and Isometric Contractions Name: Carolyn Chrzastowski Instructor: Professor Waite Date: 07.19.2015 Predictions When the arm goes from resting to flexing, the amplitude and frequency of sEMG spikes will increase During flexion, the amplitude and frequency of sEMG spikes will ___ during extension. be greater than Recruitment of motor units will be greatest when the load is 20 pounds Materials and Methods Comparison of motor unit activation during muscle tone and concentric and eccentric isotonic contractions Dependent Variable amplitude and frequency of sEMG spikes Independent Variable muscle movement Controlled Variables total number of motor units
The weigh get heavier, the faster the punk goes. Experimental design In this experiment, the acceleration of the punk was measured with a timer and will make dots on the paper. By using different mass of weight, to calculate how does the mass affect the acceleration. Variables: Independent var. the mass of the weight dependent var.
9. Deceleration - Is the rate at which the velocity of an object changes over time. 10. Force of impact - An impact is a high force or shock applied over a short time period when two or more bodies collide. Module 4: Signs, Signals & Pavement Markings 1.
79. ANS: Yes, speed and direction will change. 80. ANS: Both cause waves to bend. Refraction occurs when waves change speed when changing media.
Ecological Footprint Bobby Chaiton Westfield State College Physical Geography Section 001 Carston Braun November 17, 2013 1. Describe the general time sequence between 24 and 30 August 2005 in terms of central air pressure and sustained wind-speed changes The wind speed changes when there is a difference in air pressure because of a function called the pressure gradient force. Simply put, the larger the difference in air pressure between two areas, the faster the air moves from the higher pressure to the lower pressure, just like a ball rolls down a steep hill faster than a more gently sloped one. As the central pressure of a hurricane increases, it causes the overall difference in pressure from the inside to the outside to become less, and thus the wind speed decreases in response
The stronger the magnet the greater the field. The static magnetic field can have mechanical effects on the pacemaker. It has been known to effect certain parts of the pacemaker allowing it to revert to different intervals of pacing. It also has the ability to reprogram or reset the device all together. The static magnetic field exerts a magnetic force that can dislodge the pacemaker leads.
As it begins to climb the next hill, the speed decreases. This is because of the acceleration due to gravity, which occurs at 9.80m/s2 straight down toward the center of the Earth. The initial hill, or the lift hill, is the tallest in the entire ride. As the train is pulled to the top, it is gaining potential, or stored energy. The higher the lift, the greater the amount of potential energy gained by the train.
(With resistance) Air: with resistance, syringe A can still be pushed a little towards syringe B. this is because particles in air are spread out; there are room in between to particles. That is why when syringe A is pressed down, the particles compressed together tightly causing the syringe to move a little before the particles were impacted too tightly for the syringe to move Water: water particles are different from gas particles. Water has very little compressibility. Particles in water are much more compacted together, therefore giving no space for them to compress more. This is the reason why with resistance, syringe A will not move as the particles in water are as tightly compressed together as they can get.
The potential energy of a spring depends on what the spring is made of and how far back the spring is pulled. The stiffer the spring, the more energy can be stored, and the further it is pulled back, the more energy is stored. I collected data by taking a ruler holding it and saw how high it went
Description and Theories A. Principles and Theories Used to Obtain our Result An conventional spring, when subjected the weight (w=mg) of an object at one of its terminations, will displace a certain distance, x, with an equal and opposite force, F, being created in the spring of which opposes the pull of the weight. This conventional spring will become significantly distorted if it is subjected to a large enough weight and the force, F, will only be able to return the spring to its original configuration once the burden is removed. The force that will restore the spring to its original configuration is directly proportional to the displacement that occurred. The following equation represents this relationship where k denotes the spring constant or stiffness of the spring, F=-kx Since x symbolizes the displacement or change in the length of the spring the above equation can now be surmised in the following manner, F=mg=-k∆l This new form makes it evident that a linear proportion exists between the plot of F as function of changing in length, ∆, thus confirming the spring does in fact obey Hooke’s Law.