Three, two, one, fire! This is the command you would have heard right before the hit of rocks, stones, or even dead animal meat which left holes in crumbling castle walls in medieval times. The source of the projectile, and one of the most feared weapons of medieval times was a trebuchet, a powerful machine used to hurl projectiles. Trebuchets were able to throw massive objects at high speeds over great distances with great accuracy. Hurling objects into the air with great force has sparked great interest about the construction and operation of trebuchets.
Forces Test Review 1. Inertia can be best described as the (A) force that keeps an object in motion with constant velocity (B) force that keeps an object at rest (C) force that overcomes friction (D) property responsible for an object's resistance to changes in motion (E) property responsible for slowing down an object 2. A box is given a sudden push up a ramp. Friction between the box and the ramp is not negligible. Which of the following diagrams best represents the directions of the actual forces acting on the box as it moves upward after the push?
After two attempts to pull himself up on a three foot high bar, he was successful in raising his body high enough to lift his leg up over it. Z’s fine motor skills are still developing. He exhibited the most skill while manipulating objects in play. For example, in observation 2, he lined up many animals, balancing them and lining them up in rows. In this same observation, he stacked round cylinders up to his eye level before the tower collapsed.
Seismic Base Isolation Technique for Earthquake-Resistant Buildings At the Earth's surface, seismic waves cause the ground to shake and vibrate, sometimes violently. This can create enormous stresses for a building's structural elements. If those stresses are large enough, the building can collapse or get heavily damaged. “Every year, earthquakes take the lives of thousands of people, and destroy property worth billions.” (How Stuff Works Science) Many people have asked, is it possible to keep buildings upright during catastrophic earthquakes? Since earthquakes are unpreventable and unpredictable, the only option for us is to design and build buildings that are earthquake resistant.
Steel pipes convey the fluid along the body structure and rigid axel members, but flexible hoses connect the sprung body pipes to the unsprung axel wheel-brake units, to allow for relative movement. 2. Master-cylinder converts foot-pedal force to hydraulic pressure within the fluid system by means of the cylinder and piston every time the drivers’ foot applies a load on the pedal. 3. Disc-brake consists of a disc bolted to the wheel hub and sandwiched between two pistons and friction pads supported in a calliper fixed to the stub-axle.
c. Use wood screws to attach the U-channel pieces to the side pieces. d. Use wood screws to attach the side pieces to the back (drive screws through the back and into the side pieces). Use the "hip" piece with the casters mounted on it to make sure that the side supports are set at the correct distance. The casters should roll easily in the tracks made by the U-channels. 3.
There are a few different types of joints in the human body such as ball and socket joints, hinge joints and pivot joints all which allow different types of movement. These joints are held together by muscles which work like levers to allow the bones at a joint to work like hinges. Muscles pull and move the bones at particular joints and this is what makes joints move thus the body moves. When supporting moving and positioning activities it is important to remember that muscles can only move joints as far as the joint allows. For example knees and elbow joints have limited movement and it is important to know how easy it is to these damage joints for example heaving people around a bed without using correct equipment or illegal lifting a person under their arms.
F stands for the net force acting on that body, m for the mass, and “a” for the acceleration of the body. Typically a bigger person, or a heavyweight boxer, would apply more force in a punch. This is true because the more mass along with acceleration yields a greater net force in the equation F=ma. A hard hit comes from a hard punch. The harder the punch the quicker it has been thrown.
Lab: 3/28/2014 Acceleration of the air hockey punk Background information Pulley system is a device that is made of grooved wheels. It is a popular tool that uses to help people to lift up heavy objects with a simple structure; rope and a wheel. The design of the pulley is base on Newton's second law( if the net force is not balance ,the object accelerates in the direction of the net force). The pulley system that was used in this experiment. The weight was tightened at the end of a rope, during it is dropping toward the grand, there is a acceleration due to gravity; as a result net force of the punk was not zero( equal the force of gravity), it accelerated and moved toward
These processes are also known as cold working. In our lab, we showed how cold working will increase the strength of a metal material by inducing plastic deformation on a steel sample and an aluminum sample using an MTI tensile testing machine. INTRODUCTION Work Hardening Work hardening is defined as the phenomenon that occurs when a metal is strained beyond the yield point. Increasing stress is required to produce additional plastic deformation causing the metal to become stronger and more difficult to deform. If true stress is plotted against true strain, the rate of strain hardening tends to become almost uniform, that is, the curve becomes almost a straight line [2].