Physics Exam #2 Flashcards | Quizlet What are the main forces that act on a hockey puck during gameplay? Q: A body of unknown mass and resting on a horizontal ground is applied an upward force of 100 N at a. Elasticity: The amount of force applied by the stick determines the degree of deformation or compression of the puck. [latex] {\overset{\to }{F}}_{\text{net}}=95.0\hat{i}+283\hat{j}\text{N} [/latex]; b. We also use third-party cookies that help us analyze and understand how you use this website. In a first simplified analysis of the energy transformations during forward strides, we consider motion along the straight-line tracks at an angle from the average direction of motion, along the y axis, as shown in figure 4. Although it is slick, an ice surface provides some friction that slows the puck. Unfortunately, when putting this into the equation for acceleration theres a snag the acceleration can be used to determine the change in velocity, but the magnitude of the acceleration now also depends on the velocity. Fnet N This problem has been solved! The skating then shifts to forward strides, as shown in figure 3 with the resulting tracks in the ice shown in figure 4. Magnetic fields are known to have a significant impact on the movement of metallic objects. No net force means no movement, so you apply a pushing force, such as a hit from a hockey stick, which results in the puck travelling at a constant speed forever. How the Magnetic Properties of the Puck Affect the Game of Hockey. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Hayward-Ellis et al [18] analysed the 'ground reaction forces' using different arm swing techniques and found that the sideways reaction forces caused by this arm swing is comparable to the sideways force from the skates. Connect and share knowledge within a single location that is structured and easy to search. Angular momentum is more commonly associated with figure skating, where the body of the skater forms the centre of the circle, and the arms are pulled in to reduce the moment of inertia, leading to higher angular velocities. Figure 1. This paper investigates an alternative stride, with a longer gliding phase in a circular arc, where the centripetal force provided by the ice acting on the skates changes the direction of motion, without the need for additional energy. A smooth change from forward to backward skating allows the player to be able to still keep an eye on the puck. (a) Your car is parked outside your house. She was wearing her seat belt and suffered no physical harm (just a great deal of embarrassment), but the cupcakes flew into the dashboard and became smushcakes. Explain what happened. The Puck A hockey puck is made of a hard vulcanized rubber material, able to withstand the high level of wear and tear during a game. According to Newtons first law, there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. So what about hitting the puck around an entire hockey rink (about 180 m, in the shape of a rounded rectangle) with one shot? Marking of the ice tracks from a demonstration of the angular momentum skating technique. When the ball hits a wall, the wall exerts a force on the ball causing it to recoil. (b) Then the hockey puck is pushed across the ice by a hockey stick with force F as drawn below, with the magnitude and angle indicated. And, since I'm not constantly either pushing the puck, or pulling the puck there are no other forces acting on the puck, because me shooting the puck was just a one time force. Follow-through: Finally, the follow-through of the stick after impact can affect the trajectory and speed of the puck. Hence, the net force acting on the puck is zero and it glides with constant velocity. As the Apollo 13 astronauts exclaimed 'Houston, we have a problem', they discovered that they had to continue to the Moon to reverse the motionthe rocket fuel available would not be sufficient for a reversal in 'free space', whereas the motion around the Moon provided a centripetal force, capable of reversing the motion, without using any fuel for the operation. friction. One way to reduce the effects of air resistance is to make the puck as smooth as possible. [912]) where multiple sensors, as well as markers on the body and video analysis, were used to study the three dimensional motion of skaters on ice, comparing the different kinematic profiles for the initial strides of the 'acceleration phase' as well as for later strides. Additionally, the type of material used in the manufacturing of the puck and the stick can impact the amount of friction created. However, Newtons first law gives a deeper explanation of this observation. Could you even make the puck loop all around the rink? Again, using a narrow circular arc can offer a fast and energy-efficient hockey turn, described by [20] as an 'open Mohawk turn'. Friction is thus the cause of slowing (consistent with Newtons first law). Before the leg pushes off for the next stride, the speed has dropped to \alpha {v}_{i}, where the fraction <1 depends on air resistance and on friction between the ice and the gliding skate. The acceleration in the direction of motion, increasing the kinetic energy of the body, is provided by the work done by the extending leg as seen in figure 3. Understanding how friction affects a hockey pucks movement is crucial for players looking to improve their game. (The word constant can indicate zero velocity.). The ice surface provides the necessary friction for the puck to move on it. The horizontal force from the ice is responsible for the forward, backward and sideways acceleration of centre of mass of the skater, but can do no work. This law is also known as the law of inertia. Marino [8] found that '80% of a skating stride is spent in the single support, or gliding, phase, and 20% in the double support, or propulsion, phase'. Static Friction Static friction is the amount of force that it takes to get an object moving. Depends on the time frame you look at. Understanding Momentum and Impulse | Physics Forums No additional energy is needed for the change of direction. The force from the ice can be exerted on one or both skates. 483 Video abstract views, 1 Expert Answer 100% (44 ratings) The free-body diagram on the hockey puck slides along a horizontal, smooth icy surface at a constant velocity is as follows, View the full answer

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