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Unformatted text preview: 1 Phys 1L03 Tutorial session Set 6 Sixth series: Questions on Newtons Laws For week of Feb 22, 2010 1. A mother of mass 50 kg and her daughter of mass 25 kg are ice-skating. They face each other, and the mother pushes on the daughter such that the daughters acceleration is 2 m/s 2 . a. What is the force exerted by the mother on the daughter? b. What is the force exerted by the daughter on the mother? c. What is the mothers acceleration? 2. Suppose that the coefficient of kinetic friction of the rubber of a car tire and the street is 8 . = k . What is the deceleration of a car on a flat street if the driver brakes sharply, so all the wheels are locked and skidding? 3. A force F = 180 N pulls on a crate at a 60 o on a rough surface. The weight of the crate is 296 N and the friction force between the crate and the surface is 90 N. What state of motion may the crate be? 4. A man pushes a heavy crate. His push makes an angle of 30 o with the horizontal, as shown. The mass of the crate is 60 kg, and the coefficient of sliding friction is...
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