Chapter 5 Applying Newton’s Laws - SFU.ca · PDF file• Using Newton’s second law ... • Applying Newton’s third law Chapter 5 Applying Newton’s Laws ......
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3. The coefficient of static friction is A. smaller than the coefficient of kinetic friction. B. equal to the coefficient of kinetic friction. C. larger than the coefficient of kinetic friction. D. not discussed in this chapter.
A wooden box, with a mass of 22 kg, is pulled at a constant speed with a rope that makes an angle of 25° with the wooden floor. What is the tension in the rope?
A rod is suspended by a string as shown. The lower end of the rod slides on a frictionless surface. Which figure correctly shows the equilibrium position of the rod?
A sled with a mass of 20 kg slides along frictionless ice at 4.5 m/s. It then crosses a rough patch of snow which exerts a friction force of 12 N. How far does it slide on the snow before coming to rest?
Macie pulls a 40 kg rolling trunk by a strap angled at 30° from the horizontal. She pulls with a force of 40 N, and there is a 30 N rolling friction force acting on trunk. What is the trunk’s acceleration?
Burglars are trying to haul a 1000 kg safe up a frictionless ramp to their getaway truck. The ramp is tilted at angle θ. What is the tension in the rope if the safe is at rest? If the safe is moving up the ramp at a steady 1 m/s? If the safe is accelerating up the ramp at 1 m/s2? Do these answers have the expected behavior in the limit θ → 0° and θ → 90°?
A 50 kg student gets in a 1000 kg elevator at rest. As the elevator begins to move, she has an apparent weight of 600 N for the first 3 s. How far has the elevator moved, and in which direction, at the end of 3 s?
A car traveling at 20 m/s stops in a distance of 50 m. Assume that the deceleration is constant. The coefficients of friction between a passenger and the seat are µs = 0.5 and µk = 0.3. Will a 70 kg passenger slide off the seat if not wearing a seat belt?
Suppose the mass of a bus is greater than that of a mosquito and that the mosquito is moving in the same direction as the bus but not quite as fast so that
A. The bus exerts more force on the mosquito.
B. The bus and mosquito exert the same force on each other.
Block A has a mass of 1 kg; block B’s mass is 4 kg. They are pushed with a force of magnitude 10 N.a) What is the acceleration of the blocks?b) With what force does A push on B? B push on A?
A. The string tension and the friction force acting on A.B. The normal force on A due to B and the weight of A.C. The normal force on A due to B and the weight of B.D. The friction force acting on A and the friction force acting on B.
Block A, with mass 4.0 kg, sits on a frictionless table. Block B, with mass 2.0 kg, hangs from a rope connected through a pulley to block A. What is the acceleration of block A?