4.2. Equilibrium of forces
A subsection of Physics, 9702, through 4. Forces, density and pressure
Listing 10 of 113 questions
Define the torque of a couple. A uniform rod of length 1.5 m and weight 2.4 N is shown in . rod pin weight 2.4 N rope B rope A 8.0 N 1.5 m 8.0 N The rod is supported on a pin passing through a hole in its centre. Ropes A and B provide equal and opposite forces of 8.0 N. Calculate the torque on the rod produced by ropes A and B. torque = N m Discuss, briefly, whether the rod is in equilibrium. The rod in is removed from the pin and supported by ropes A and B, as shown in . weight 2.4 N rope A rope B 1.5 m 0.30 m P Rope A is now at point P 0.30 m from one end of the rod and rope B is at the other end. Calculate the tension in rope B. tension in B = N Calculate the tension in rope A. tension in A = N
9702_w11_qp_21
THEORY
2011
Paper 2, Variant 1
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Distinguish between scalars and vectors. Underline all the vector quantities in the list below. acceleration kinetic energy momentum power weight A force of 7.5 N acts at 40° to the horizontal, as shown in . 40° 7.5 N horizontal Calculate the component of the force that acts horizontally, horizontal component = N vertically. vertical component = N Two strings support a load of weight 7.5 N, as shown in . 40° 7.5N 50° T2 T1 horizontal One string has a tension T1 and is at an angle 50° to the horizontal. The other string has a tension T2 and is at an angle 40° to the horizontal. The object is in equilibrium. Determine the values of T1 and T2 by using a vector triangle or by resolving forces. T1 = N T2 = N
9702_w11_qp_23
THEORY
2011
Paper 2, Variant 3
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Questions Discovered
113