On The Move Special Homework PDF

Name ________________________ Class ________ On the Move 100 Special Homework...

Name ________________________ Class ________ On the Move 100 Special Homework 1a. The picture on the left shows a geyser. i. Is a geyser defined as a renewable or non- renewable energy source? ________________________________________ ii. What is the primary source of the geyser? ________________________________________ iii. Give two examples of renewable energies that can be used on the Maltese Islands. ________________________________________ iv. The world is trying to change power stations that run on non-renewable energy sources to ones that run on renewable energy. Give two reasons why. __________________________________________________________________________________ _______________________________________________________________________________ b. Biomass is also defined as a renewable energy source, but it does not give all the advantages of the other renewable energies. Explain. __________________________________________________________________________________ _______________________________________________________________________________ c. Electric cars still run on non-renewable energy sources, yet they are preferred to fuel run vehicles. Can you explain why? __________________________________________________________________________________ _______________________________________________________________________________ 10 1 2. https://www.sciencedirect.com/science/article/pii/S0 167610521001574 a. Two cyclists racing in a competition took different postures while racing. i. Who would manage to go fastest the cyclist in the stem position or the cyclist in the drops position? ______________________________________ ii. Explain your answer in ‘i’? __________________________________________________________________________________ _______________________________________________________________________________ b. The table below is the speed of the cyclist taking the drops position against the power output. Speed (m/s) 0 5 7.5 9.0 10.5 12.0 14.5 Power output (W) 0 60 120 180 240 300 360 i. Plot a graph of speed of the cyclist (m/s) on the Y axis against power output (W) on the X axis. ci. Calculate the energy the cyclist uses up when his power output is 300W for 1800s. __________________________________________________________________________________ __________________________________________________________________________________ _______________________________________________________________________________ In reality, the total power the cyclist needs to develop an output power of 300W is 450W. cii. Calculate the efficiency of the cyclist. __________________________________________________________________________________ __________________________________________________________________________________ _______________________________________________________________________________ c. The maximum speed attained by the cyclist on level ground was 14.5m/s. His maximum speed is less than this when he climbs uphill. Explain why. __________________________________________________________________________________ _______________________________________________________________________________ 14 2  https://mathspace.co/textbo oks/syllabuses/Syllabus- 1007/topics/Topic- 20226/subtopics/Subtopic- 266208/ 3i. Anna rode her motorcycle to work. Describe the motion during the first hour (A) of the journey. ______________________________________________________________________________ ii. In which part A, B, C or D did Anna stop to take a coffee on her way to work? _____________ iii. Which part of the journey shows Anna returning home? ______________________________ iv. When was Anna travelling fastest? Show your calculations __________________________________________________________________________________ __________________________________________________________________________________ _______________________________________________________________________________ v. Calculate the total distance covered by Anna during her trip to work and back. __________________________________________________________________________________ _______________________________________________________________________________ vi. Calculate the total displacement Anna covered in these 6 hours travelling. _______________________________________________________________________________ 10 3  https://www.drawingtutorials101.com/how-to-draw-a-cheetah-running 4a. A stationary cheetah can attain a velocity of 21m/s in 2 seconds. Calculate its acceleration. __________________________________________________________________________________ _______________________________________________________________________________ bi. Following a scent the cheetah travelled at a constant speed of 10m/s for 60s. What distance did the cheetah cover in that time? _______________________________________________________________________________ ii. When the cheetah saw a gazelle it increased the speed to 20m/s in 1s. Calculate the new distance covered by the cheetah in this case. __________________________________________________________________________________ __________________________________________________________________________________ _______________________________________________________________________________ 5 5. Katrin wanted to return her library books. So, she took a trip with her car to the library. The velocity-time graph shows her trip. https://study.com/learn/lesson/velocity- time-graph-examples.html 4 ai. What was Katrin’s starting velocity? _______________________________________________________________________________ ii. For how long did she keep on accelerating? _______________________________________________________________________________ iii. Did she stop travelling between the 20th and the 40th seconds? Explain your answer. __________________________________________________________________________________ __________________________________________________________________________________ _______________________________________________________________________________ iv. Calculate her deceleration. __________________________________________________________________________________ _______________________________________________________________________________ v. How long did she take to arrive at the library? _______________________________________________________________________________ bi. When Katrin was returning home, she saw a hedgehog crossing the road and decided to stop. Some time passed until she managed to push the brake pedal. What is this time lapse called? _______________________________________________________________________________ ii. If Katrin was travelling at 30m/s and the time lapse mentioned above was 0.8s. How far had she travelled during this time? _______________________________________________________________________________ iii. When Katrin pressed the brake the hedgehog was 10m away, how much time did Katrin have to stop in time not to run over the hedgehog? __________________________________________________________________________________ _______________________________________________________________________________ 12 6. Maria always dreamt of going sky diving. Finally, she decided to get some training to be able to practice this sport. Maria has a mass of 60kg and the trainer has a mass of 75kg. https://www.vectorstock.com/royalty-free-vector/tandem-skydiving- vector-1576468 a. What is the velocity of Maria and the trainer when they step out of the helicopter? ____________________________________________ 5 b. Draw the forces acting on Maria and her trainer after a few seconds that they are floating in the air. c. Name and calculate the force that is pulling the two persons down towards the ground. ___________________________________________________________________________ d. After a while they are moving down at constant velocity. i. What is the resultant force acting on the two persons? ___________________________________________________________________________ ii. Which one of Newton’s Laws applies in this case? ___________________________________________________________________________ e. At a safe distance above the ground the trainer opens the parachute. The graph on the right shows the graph of the two skydivers. i. At what point A, B, C and D was the parachute fully opened? _____________________________________ ii. What is the maximum speed attained by the two sky divers? _______________________________________ iii. Define terminal velocity. ________________________________________________ ______________________________________________ iv. Indicate on the graph were terminal velocity was reached http://tankimkia.blogspot.com/2015/09/the- v. What term indicates the motion beyond the 50s? physics-of-skydiving-explain-with.html _______________________________________________ e. Maria and her trainer are finally on the ground. i. What forces are present on the two skydivers when they have landed? ___________________________________________ ii. Which of Newton’s laws applies in this case? ___________________________________________ 16 6  https://sites.google.com/site/kaycischlesener/energy/types-of-energy-kinetic-and-potential 7a. Samuel decided to cut the string holding the block to a pulley. The block has a mass of 40kg. i. Name the energy present on the block before the string was cut. ii. Name the energy present just before the block hits the wooden block. iii. Once the block hits the ground the energy supplied would be lost to the environment as: __________________ and ___________________________ iv. State the law of conservation of energy: _______________________________________________________________________________ ____________________________________________________________________________ v. If the block is 5m above the wooden block, calculate the value of the energy in ‘1’ above. ____________________________________________________________________________ vi. What is the value of the energy in ‘2’ above? ____________________________________________________________________________ vii. Calculate the velocity with which the block hits the wooden post. _______________________________________________________________________________ _______________________________________________________________________________ ____________________________________________________________________________ v. How much time had elapsed from when the block was released until it hit the block beneath? _______________________________________________________________________________ ____________________________________________________________________________ c. Samuel decide to hang another block of mass 50kg at a height of 5m above the wooden block. i. Calculate the work done by Samuel to elevate the block through this height. _______________________________________________________________________________ ____________________________________________________________________________ ii. From where did Samuel get the energy to do this work of raising the block against gravity? ____________________________________________________________________________ iii. If the wooden block needs to be inserted further into the ground what two alterations can Samuel make to the present situation to attain this. 7  _______________________________________________________________________________ ____________________________________________________________________________ 8. https://slideplayer.com/slide/12789041/ 18 On a foggy day Daniel driving, the red car did not notice the blue car driven by Kate coming right at him. Daniel was driving at 15m/s and his car has a mass of 500Kg. Kate was driving at 20m/s and her car has a mass of 450kg. ai. What is the momentum of Daniel’s car before the collision? ____________________________________________________________________________ ii. What is the momentum of Kate’s car before the collision? ____________________________________________________________________________ iii. After collision both cars move together. What is the momentum of the cars after collision? _______________________________________________________________________________ _______________________________________________________________________________ ____________________________________________________________________________ iv. In what direction will the cars move after the collision? ____________________________________________________________________________ http://hyperphysics.phy-astr.gsu.edu/hbase/carcr.html bi. The car hit a tree and stopped moving. Calculate the impact force of the car if the actual collision stopped in 3s. 8 ____________________________________________________________________________ ii. What is the value of the force exerted by the tree on the car upon impact? ____________________________________________________________________________ iii. Which physics principle/ law helped you work out ‘ii’ above? ____________________________________________________________________________ iv. Explain how the cramping zones of the car help to reduce injury on the driver? ____________________________________________________________________________ v. Mention two other safety features in the car present to reduce injury on the driver. ______________________________________________________________________________ ____________________________________________________________________________ 15 9