energy of 15 000 J just prior to hitting the bucket of water. If Missy’s mass is 50 kg‚ then what is her speed? Solution: According to energy conservation‚ the kinetic energy at the bottom of the dive (15‚000J) is equal to her gravitational potential energy before the dive. We can use this fact to find her dive height: PE = mgh h = PE/mg = 15‚000J / (50kg)(9.81m/s²) = 31m (rounded) Her speed can also be found from energy conseration: E(final) = E(initial) 0.5mv² = mgh v = √[2gh]
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of mechanical energy; (2) To measure change in kinetic and potential energy as a ball moves in free fall; (3) And to determine power output when going up and downstairs. Theory Energy - It is one of the most important concepts in the world of science. It is the capacity of a physical system to do work (Jones). This experiment involves mechanical energy. Mechanical energy is the sum of kinetic energy (energy at motion) and potential energy (energy at rest). Work - It is
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height of 50.0cm from the motion detector to compare the graphs the it collected from the predicted graphs of the group . The results obtained from the experiment clearly demonstrated conservation of mechanical energy‚ the change in kinetic and potential energies as a ball moves in free fall and the power output when going up and downstairs. 1. Introduction Long ago‚ people used to trade by only exchanging products when the concept of ’money’ was yet to be introduced. Now we do know the concept
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determine the true relationship between the initial height of the ball and the final height of the ball. The formula to calculate gravitational potential energy is “G.P.E. = mass * gravitational force * height”. Therefore‚ increasing the height would result in a greater gravitational potential energy. However‚ under standard circumstances‚ the gravitational potential energy of the ball is converted to kinetic energy‚ while a minute amount of energy is converted into heat. Hence‚ the ball never approaches
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One Hundred and Fifty Questions 1. What two entities comprise a vector?-a vector is comprised of direction and magnitude. 2. What do you do with any vector that is not on either the x or y axis?-break it up into x and y components using trig‚ add up the components. 3. How are velocity and speed different?-velocity has a direction while speed does not. 4. What is the slope of the distance time graph? - Delta d/delta t. or distance over time. Rise over run. 5. What is
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stabilizing body position/posture‚ generates heat 2. Location: on top of/attached to bones (skeletal) AND in certain organs (smooth) 3. Organs: skeletal muscles and smooth muscle‚ tendons and ligaments Nervous System: 1. Function: generates Action Potentials (nerve impulses)‚ regulates body activities‚ detects changes in body chemistry/internal and external environment‚ interprets changes‚ responds to AP’s by causing
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are some areas of improvement for your car? Explain how it could have been made better so that the car could have performed better. During its test‚ my mousetrap car curved to the right causing it to crash into a wall and stop short of its full potential. However‚ the car still traveled the the entirety of the 11 meters required for the maximum number of points. The reasons that my mousetrap car functioned as well as it did were: (1) the light and thin CD’s that I used as wheels minimized the friction
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11.1 Distance and Displacement Choosing a Frame of Reference The motion of an object looks different to observers in different frames of reference. EX: A passenger in the rear seat of a car moving at a steady speed is at rest relative to the front seat of the car. But is not at rest relative to: the side of the road‚ a pedestrian on the corner ahead‚ or even the rotating wheels of the car. EX: Examine the figure. If you were standing under the tree‚ which object would appear to be moving
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PSYCH STUDY GUIDE Neonatal Reflexes: Babinsk: big toe lifts‚ other toes fan out Moro Reflex: arms fling out and grab something when child feels like he’s falling Palmer Grasp: touch a baby’s palms and his hand closes Planter Grasp Sucking- doesn’t need to learn how to breast feed Rooting Withdrawal – reaction to pain Vigotsky’s Theory Focuses more on cultural impact on human development Believed children actively seek to discover new principles (like Piaget) Zone of proximal
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the slow development of skills through learning. “Its all in the genes”. Either you can do it with little effort‚ or you will never be able to do it‚ so you might as well give up in the face of difficulty. E.g. “ I can’t do maths” Untapped Potential theorists: These students believe that ability and success are due to learning‚ and learning requires time and effort. In the case of difficulty one must try harder‚ try another approach‚ or seek help etc. About 15% of students
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