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Questions and Answers
Explain the difference between a scalar quantity and a vector quantity. Give one example of each.
A scalar quantity has only magnitude while a vector quantity has both magnitude and direction. Example of scalar quantity is temperature, and example of vector quantity is displacement.
Describe an experiment to measure the acceleration of free fall using a ticker tape timer. What is the significance of the result?
The experiment involves dropping an object attached to a ticker tape timer from a certain height. The timer marks the tape at regular intervals, and the distance between the marks increases as the object falls. The significance of the result is that it shows that the acceleration of free fall is constant, approximately 9.8 m/s².
A block of mass 5 kg is pulled up a rough inclined plane with a force of 30 N. If the coefficient of friction is 0.2, calculate the acceleration of the block.
First, calculate the force of friction: F_f = μmg = 0.2 × 5g = 10 N. The net force is F_net = F - F_f = 30 - 10 = 20 N. Then, use F_net = ma to find a: a = F_net / m = 20 / 5 = 4 m/s².
Explain the concept of pressure in fluids. How is it related to the density of the fluid and the depth of the fluid?
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Describe an experiment to investigate how the force exerted by a stretched rubber band changes with its extension. What does the graph of force against extension look like?
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