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JJ89
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1.A mass m = 20 kg is moving along a surface with coefficient of kinetic friction mk = 0.3.
A)What is the force of kinetic friction on the mass?
2.A wooden block of mass m = 9 kg starts from rest on an inclined plane sloped at an angle q from the horizontal. The block is originally located 5m from the bottom of the plane.
a)If the block, undergoing constant acceleration down the ramp, slides to the bottom in t = 2 s, and q = 30°, what is the magnitude of the kinetic frictional force on the block?
3A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of Fp = 21 N. The coefficient of friction of the blocks with the floor is µ = 0.13.
a) What is the acceleration of the two blocks?
a = ?m/s2
b) What is the tension in the string between the blocks?
T = N ?
4 A block of mass mblock = 1.9 kg rests on a cart of mass mcart = 3.1 kg, which moves without friction on a horizontal surface. The coefficient of static friction between the block and the cart is µ = 0.76. The cart is accelerating to the right.
a) What is the maximum acceleration such that the block does not slide on the cart?
amax = ? m/s2
b) What is the magnitude of the force on the cart required to provide the acceleration amax?
F = N ?
A)What is the force of kinetic friction on the mass?
2.A wooden block of mass m = 9 kg starts from rest on an inclined plane sloped at an angle q from the horizontal. The block is originally located 5m from the bottom of the plane.
a)If the block, undergoing constant acceleration down the ramp, slides to the bottom in t = 2 s, and q = 30°, what is the magnitude of the kinetic frictional force on the block?
3A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of Fp = 21 N. The coefficient of friction of the blocks with the floor is µ = 0.13.
a) What is the acceleration of the two blocks?
a = ?m/s2
b) What is the tension in the string between the blocks?
T = N ?
4 A block of mass mblock = 1.9 kg rests on a cart of mass mcart = 3.1 kg, which moves without friction on a horizontal surface. The coefficient of static friction between the block and the cart is µ = 0.76. The cart is accelerating to the right.
a) What is the maximum acceleration such that the block does not slide on the cart?
amax = ? m/s2
b) What is the magnitude of the force on the cart required to provide the acceleration amax?
F = N ?