IB Middle Years Physics Practice Questions PDF

Learning Alliance International Practice Questions for exam IB Middle Years Physics Grade: MYP IV Total: 93 points Authors: Taimur Abbas Page 1 of 19 Task 3 Q 1.1 Hamza went skiing for his winter vacation. The forces acting on him a...

Learning Alliance International Practice Questions for exam IB Middle Years Physics Grade: MYP IV Total: 93 points Authors: Taimur Abbas Page 1 of 19 Task 3 Q 1.1 Hamza went skiing for his winter vacation. The forces acting on him as he skies A1 downhill are shown in the diagram below. Label Hamza's weight, W, and the normal force, N, acting on him. Page 2 of 19 Q 1.2 Show the resultant force acting on Hamza on a copy of the diagram below. A2 Markscheme Page 3 of 19 Q 1.3 Describe the effect of the resultant force on Hamza's downhill motion, with reference A3 to Newton's second law. Markscheme Newton's second law states that the net force acting on an object is proportional to its acceleration, The net force acting on Hamza will accelerate him downhill, that is, his speed will increase at a constant rate. Page 4 of 19  Hamza is now practicing making smooth turns while travelling up sloped inclines. The velocity-time graph in the gure below shows his motion travelling up an embankment and part-way down. Q 1.4 Determine his acceleration at time t = 8.0 s. C2 Markscheme Evidence of using gradient formula, such as, using (6, 12) and (11, 0), a = -2.4 ms-2 [negative sign is necessary] Q 1.5 Calculate his displacement in the rst 5 seconds of the journey. C2 Markscheme Page 5 of 19  Markscheme Evidence of nding the area under the graph such as, 5 × 12 distance = 60 m Q 1.6 State the time at which he started to travel back down the embankment. C1 Markscheme 14 s Page 6 of 19 Cartoon Analysis The following questions will test skills assessed under Criterion A: Knowing and Understanding. In the movie 'Up', a 78-year-old balloon salesman Carl Fredricksen is ful lls his lifelong dream by tying thousands of balloons to his house and ying away to the South American wilderness. Content type: Video This item includes interactive content. Please refer to the digital version of this assessment to view this item. An MYP students designs an experiment to calculate the number of balloons required to allow the house in the movie "UP" to oat motionless in equilibrium. She takes a helium balloon and attaches a paperclip to its string. The paperclip is used to attach a piece of cardboard to the balloon. The adjusts the size of the cardboard so that the balloon does not oat, not does it sink. Page 7 of 19 Q 2.1 Draw arrows to represent the forces acting on the balloon. A2 Q 2.2 Calculate the net force (resultant force) on the balloon. A2 The student then measures the mass of the piece of string, paperclip and the cardboard attached to the balloon. She calculates the mass to be 10.0 g. Q 2.3 State the name of the instrument she uses. B1 Q 2.4 Calculate the upthrust on the balloon. A2 Q 2.5 In the movie “Up”, the main characters, oat away in a house supported by many A4 many helium balloons. The mass of the house is 5000 kg. Assuming that the balloons are identical to the ones the student used and have the same upthrust to calculate the buoyant force/upthrust required from the balloons for the house hover motionless in the air? Page 8 of 19 Q 2.6 A3 Using the buoyant force of a single helium balloon measured by the student, how many balloons would be required to make this happen? Q 2.7 In the movie, when the 5000 kg house rst lifts off of the ground, it rises with an A3 upward acceleration of 0.5 m/s2. Since there is a non-zero acceleration, this means that the buoyant force from the balloons must be greater than the weight of the house. Calculate the upthrust required for this. Q 2.8 Calculate the number of balloons required to provide the required upthrust. A2 Q 2.9 D2 Comment on the accuracy of the movie scene. Look at the videos below. For each of the scenario, explain how Physics was de ed and how it was correctly used. Your explanation for each video should talk about: The names of forces being applied The laws of Newton de ed (if any) The laws of Newton correctly applied (if any) The concept of Velocity and acceleration de ed (if any) The concept of Velocity and acceleration correctly applied (if any) The following question assess skills tested under Criterion D: Evaluating the impacts of science. Page 9 of 19  Content type: Video Clip 1 - Bugs Bunny This item includes interactive content. Please refer to the digital version of this assessment to view this item. Content type: Video Clip 2 - The Road Runner This item includes interactive content. Please refer to the digital version of this assessment to view this item. Content type: Video Clip 3 - Bugs Bunny This item includes interactive content. Please refer to the digital version of this assessment to view this item. Page 10 of 19  Content type: Video Clip 4 - Road Runner This item includes interactive content. Please refer to the digital version of this assessment to view this item. Q 2.10 D 12 Explain Page 11 of 19 Section 4 You might have noticed that if you drop your phone from a height, the phone screen might break. But if the phone falls a short distance near the ground, it will not. A student notices this, and wants to investigate whether changing the drop height of a ball affect its velocity of impact. Q 3.1 State a research question for the student's investigation. B1 Markscheme How does changing the drop height of a ball affect its velocity of impact? Q 3.2 Formulate a hypothesis for this investigation and justify using scienti c reasoning. B3 Markscheme If the drop height of the ball increases, its velocity at impact also increases. This is due to kinematics equation: ( nal velocity)^2 = (initial velocity)^2 + 2*acceleration* distance covered. If the initial velocity is always zero and the acceleration is constant (due to gravity), then increasing the distance covered by the ball is proportional to its nal velocity squared. Q 3.3 Design an experiment to investigate the research question, as stated in answer to B 14 the rst question. In your plan you must include: the independent variable, the dependent variable and the justi cation of two control variables Page 12 of 19  an equipment list how you will collect suf cient data a method detailing the procedure you will follow any precautions you must take to ensure accuracy of data any safety, environmental or ethical precautions Markscheme IV: The initial height of the ball DV: The velocity of impact CV1: The initial velocity of the ball Justi cation of CV1: must be kept zero, as we can see from the kinematics equation, stated in the hypothesis, the velocity at impact depends on the initial velocity as well. If you throw the ball with a greater speed, its velocity at impact will be higher. CV2: The mass / volume / shape of the ball Justi cation of CV2: Having a different mass /volume / shape may affect the air resistance acting on it, possible slowing down the ball and hence, changing the velocity at impact. Apparatus: Ball Ruler Photogate / Light gate (to measure velocity at the bottom) Methodology: 1. Place the ruler next to a wall and measure a length of 50 cm from the bottom of the ground. Make sure there is no parallax error. 2. Place the photogate on the oor and set it up so that you are ready to record. 3. Release the ball from this height of 50 cm (making sure not to exert any force on it). 4. Record the velocity from the photogate. 5. Repeat steps 3-4, two more times. 6. Take average of the three trials of velocity. 7. Repeat steps 1-6 with heights of 60 cm, 70 cm, 80 cm, and 90 cm. Safety precautions: (Any two) Make sure to perform the experiment away from fragile things. Make sure to use a ball which is not too heavy in case it falls on the photogate and damage it. Wear closed toe shoes in the lab. Q 3.4 B5 Page 13 of 19  Suggest a second investigation into another factor that could affect the velocity of the ball at impact. For this new investigation, you should include: a research question the independent and dependent variables two relevant control variables Markscheme a research question How does changing the mass of the ball affect its velocity at impact? the independent and dependent variables IV: Mass of the ball DV: Velocity at impact two relevant control variables CV1: Drop height CV2: Initial velocity Page 14 of 19 Task 3 An MYP student conducts an investigation using a hanging mass on a spring. They displace the hanging mass vertically from its equilibrium position and measure how long it takes to complete one oscillation, that is, The student formulates the research question: If the mass on a spring increases, what happens to the time period of the oscillation? Page 15 of 19 Q 4.1 Design an experiment to investigate this research question. B 12 In your plan you must include: the independent variable, the dependent variable and the justi cation of two control variables a hypothesis that be tested by this investigation, along with justi cation an apparatus list a method detailing the procedure you will follow Page 16 of 19 Task 5 The Dead Sea is a unique environment which is fed by the River Jordan. The rapid loss of water threatens its existence. As a result, there are various proposals to protect the Dead Sea. One scheme proposes that 2.05 × 1012 kg of water from the Red Sea is pumped into the Dead Sea every year. The water would have to be pumped along 140 km of pipes. Map Source: Semantic Scholar Q 5.1 Discuss one advantage and one disadvantage of this scheme. You may wish to refer D4 to the map. Markscheme Page 17 of 19 Q 5.2 The density of the sea water is 1,025kg m-3. Calculate the volume of the water which A2 would be pumped into the Dead Sea every year Markscheme Q 5.3 The Dead Sea has a surface area of about 600km2. Convert this into m2. A2 Markscheme Q 5.4 Calculate the amount that the pumped water would raise the level of the Dead Sea A2 by every year. Assume that there is no loss of sea level by any other means. Markscheme Page 18 of 19  Markscheme Q 5.5 According to the studies, the depth of Dead Sea decreases by 0.94 m every year due D4 to climate change and other natural causes. Evaluate the effectiveness of this solution (the Peace Conduit) with reference to your calculations, information provided and your prior discussion on advantages and disadvantages. Markscheme Additional mark for a concluding appraisal. Page 19 of 19