01
A plane takes off, and flies to 700 m. It transfers 50 kJ of energy to a gravitational store. Calculate the vertical force which was required. Write a definition for ‘work done’
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What is the equation for ‘work done’? Include units. Write a definition for ‘power’.
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What is the equation for ‘power’? Include units. What is Newton’s third law?
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______________________________________ Two horses (A and B) run a 2 km race. They both exert the same force forwards, but horse A takes twice as long as horse B.
Compare the work done by each horse.
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Compare the power of each horse
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____________________________________ Draw a free body diagram for a boat which is accelerating. Label the forces. Forces doing work Name 3 contact forces
Name 3 non-contact forces Explain why weight is not used in the calculation of the energy required for horizonal motion.
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____________________________________ Add arrows to the diagrams below to show the reactionary forces; A woman is swimming across a river. She swims perpendicular to the banks with a force of 500 N. The current has a force of 300 N parallel to the banks.
Draw a scale diagram to work out the magnitude and direction of the resultant force. A dolphin jumps at an angle of 20o to the horizontal with a force of 300 N. Draw a scale diagram to find the horizontal component of this force.<br>