题目
SPHY001 Practice Quiz - Unit 06 | LA046
单项选择题
What provides the centripetal force when a car going round an unbanked corner?
选项
A.Normal reaction
B.Gravity
C.Tension
D.Friction
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标准答案
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思路分析
Consider what provides the inward, centripetal push for a car rounding a flat (unbanked) corner.
Option 1: Normal reaction — This force acts perpendicular to the road surface, i.e., vertically upward for a flat road. It does not point toward the center of the circle, so it can......Login to view full explanation登录即可查看完整答案
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类似问题
Which of the following statements is true about the centripetal force acting on a mass m that is executing uniform circular motion? 1. It is perpendicular to the particle's acceleration 2. It is perpendicular to the particle's velocity 3. It is equal to the total tangential force acting on the particle 4. It is equal to the total force pointing towards the center of the circular path 5. All are true
The Excel task Instructions The data below were collected by performing a simple activity: measuring the centripetal force acting on a rotating object at different angular speeds. The equation below shows the relationship between the force ( 𝐹 ) , mass ( 𝑚 ) , velocity ( 𝑣 ) and radius ( 𝑟 ) : 𝐹 = 𝑚 𝑣 2 𝑟 Where: F = centripetal force (N) m = mass (kg) v = velocity (m/s) r = radius of the circular path (m) Transfer the following data to an Excel spreadsheet. Velocity ( 𝑚 𝑠 − 1 ) Force ( 𝑁 ) 0 0 0.5 0.14 1 0.61 1.5 1.42 2 2.47 2.5 3.93 3 5.66 3.5 7.68 4 9.87 In your Excel file, plot force ( 𝐹 ) on the y-axis and velocity ( 𝑣 ) on the x-axis. Include the titles, axis labels, and correct units (3 marks). Is the force proportional to velocity? Explain your observation in the Excel spreadsheet (1 mark). Answer in your Excel spreadsheet using a text box. Use the equation above to linearise the variables 𝐹 and 𝑣 to find the proportional relationship between 𝐹 and 𝑣 . Add the proportional variables to the Excel spreadsheet table (1 mark). Plot the linearised variables on a second graph. On this graph, make sure to put labels, units and a title. Also include a line of best fit and the linear equation, as well as 𝑅 2 (2 marks). What is the gradient value? (1 mark) (Hint: use the second graph's equation to identify the value). Answer in your Excel spreadsheet using a text box. From the gradient value of your linear equation and the equation above, determine the radius of the circular path (r), making sure to write the units in your final answer (1 mark). Assume the mass of the object is 0.5 kg Answer in your Excel spreadsheet using a text box. Note: Please use proper chart formatting, labels, a neat layout, and text boxes for comments and the final answer (1 mark).
A 1 kg object is tied using a string and spun in a vertical circle. The tension of the string varies such that it is zero at the top of the circle. Determine the magnitude of the tension in the string when the object is at the bottom of the circle. Assume that the speed of the object is constant throughout the circular motion.
What provides the centripetal force when a car going round an unbanked corner?
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