1.A dockworker loading crates on a ship finds that a 225 kg crate, initially at rest on a horizontal surface, requires a 600 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 550 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor. (a) the coefficient of static friction = and (b) the coefficient of kinetic friction = (2 marks)
1.A dockworker loading crates on a ship finds that a 225 kg crate, initially at rest on a horizontal surface, requires a 600 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 550 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor. (a) the coefficient of static friction = and (b) the coefficient of kinetic friction = (2 marks)
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![1.A dockworker loading crates on a ship finds that a 225 kg crate, initially at rest on a horizontal
surface, requires a 600 N horizontal force to set it in motion. However, after the crate is in motion, a
horizontal force of 550 N is required to keep it moving with a constant speed. Find the coefficients
of static and kinetic friction between crate and floor.
(a) the coefficient of static friction =
and
(b) the coefficient of kinetic friction =
(2 marks)
2. A block with mass m, = 4.00 kg and a ball with mass m2 = 8.000 kg are connected by a light string
that passes over a frictionless pulley, as shown in Figure. Find the acceleration of the two objects
and the tension in the string. Also calculate the distance each object will move in the first second of
motion if both objects start from rest.
m
(a) the acceleration of the two objects =
m/s?
(b) the Tension in the string
(C) distance each object will move in the first second of motion =
(5
marks)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff2a13694-c446-48e8-b79c-c74e4b7ab1b6%2F029222ac-c8b7-41b8-93aa-caa1ffea958d%2F1bgu2hc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1.A dockworker loading crates on a ship finds that a 225 kg crate, initially at rest on a horizontal
surface, requires a 600 N horizontal force to set it in motion. However, after the crate is in motion, a
horizontal force of 550 N is required to keep it moving with a constant speed. Find the coefficients
of static and kinetic friction between crate and floor.
(a) the coefficient of static friction =
and
(b) the coefficient of kinetic friction =
(2 marks)
2. A block with mass m, = 4.00 kg and a ball with mass m2 = 8.000 kg are connected by a light string
that passes over a frictionless pulley, as shown in Figure. Find the acceleration of the two objects
and the tension in the string. Also calculate the distance each object will move in the first second of
motion if both objects start from rest.
m
(a) the acceleration of the two objects =
m/s?
(b) the Tension in the string
(C) distance each object will move in the first second of motion =
(5
marks)
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