conservative if the net work done by the force on an object moving around any closed path is zero. Copyright © 2009 Pearson Education‚ Inc. 8-1 Conservative and Nonconservative Forces If friction is present‚ the work done depends not only on the starting and ending points‚ but also on the path taken. Friction is called a nonconservative force. Copyright © 2009 Pearson Education‚ Inc. 8-1 Conservative and Nonconservative Forces Potential energy can only be defined for conservative forces
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aisle. 1.6 kJ 2. A horizontal force of 150 N is used to push a 40.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed‚ find (a) the work done by the 150-N force and (b) the coefficient of kinetic friction between the crate and surface. 900J‚ 0.383 3. A block of mass 2.50 kg is pushed 2.20 m along a frictionless horizontal table by a constant 16.0-N force directed 25.0° below the horizontal. Determine the work done by (a) the applied force‚ (b)
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be transformed from one type into another and in this case all the potential energy transformed into an equal quantity of kinetic energy keeping the total amount of energy constant. Data Analysis and Discussion: The above simulations both prove that at any given time during the track‚ the total energy remains constant as proved by the yellow bar & that the kinetic (green bar) and potential energy (blue bar) constantly interchange between each other but always add up to the same amount
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Simple Machine: A machine with few or no moving parts. Simple machines make work easier. Examples: Screw‚ Wheel and Axle‚ Wedge‚ Pulley‚ Inclined Plane‚ Lever Compound Machine: Two or more simple machines working together to make work easier. Examples: Wheelbarrow‚ Can Opener‚ Bicycle Inclined plane: A sloping surface‚ such as a ramp. Makes lifting heavy loads easier. The trade-off is that an object must be moved a longer distance than if it was lifted straight up‚ but less
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energy‚ and energy is what physics is all about. There is kinetic energy‚ potential energy‚ conservation of energy‚ velocity‚ acceleration‚ mass‚ force‚ and gravity. Energy gives you the ability to do work. Energy is everywhere in nature and in life‚ we use energy every day. There are many forms of energy; light‚ chemical‚ mechanical‚ heat‚ electric‚ automatic‚ and sound. All these forms of energy can be broken down either into kinetic energy or potential energy. The law of conservation of energy
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is increased then so is the potential energy. The maximum kinetic energy is at B. This is because as the cars lose height‚ they speed up (v=d/t). Therefore‚ most of their original potential energy (due to the height) is transformed into kinetic energy (due to the velocity) while some of the energy is turned into heat energy due to friction. Because the rollercoaster has just begun‚ the coaster has not yet lost a lot of energy due to friction and therefore most of
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Elemental Geosystems‚ 5e (Christopherson) Chapter 10 Weathering‚ Karst Landscapes‚ and Mass Movement 1) The science that specifically studies the origin‚ evolution‚ form‚ and spatial distribution of landforms is A) geology. B) geography. C) geomorphology. D) environmental chemistry. Answer: C 2) All processes that cause the wearing away or rearrangement of landforms are included in the term A) mass movement.
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5.2 Energy conversion and conservation 1. A change from one form of energy to another is called an energy conversion. 2. Is the following sentence true or false? Most forms of energy can be converted into other forms. True 3. Describe the conservation of chemical energy to mechanical energy in your body. Your body changes chemical energy which was in your food through the system of digestion. Once the energy is released‚ it turns to mechanical energy to move your muscles 4. When you throw
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Our egg drop project that we named Eggpolo 6 was unsuccessful. During the drop‚ the two forces gravity and air resistance‚ or fluid friction‚ will act on the Mars lander. Gravity will be pulling the lander down towards the center of the Earth. But fluid friction will be pushing the Mars lander up in the air and slowing the lander down before it hits the ground. When it hit the ground the Eggpollo 6 gave the ground an action force. The ground gave a reaction force causing the Eggpollo 6 to bounce
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pressure to the velocity for a fluid of constant density flowing in a Venturi tube. Static head‚ normalised head and percentage of errors were calculated using the result of the data. On the base of calculation its being analysed that in the contraction flow‚ velocity and dynamic head increases with decreased static pressure and dynamic pressure. While in the convergent flow‚ velocity decreases with increased static pressure and dynamic pressure. Introduction: [pic] Figure (1) sketch of Apparatus
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