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Force and Moment of Force Quiz Forces Moments of Force Body Segment Parameters Mass Centre of Mass (or Gravity) Moments of Inertia

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1. Which statement best defines the moment of inertia? a) Time immediately before a motion starts. b) Reluctance of a rigid body to linearly accelerate. c) Quantity of angular motion. d) Resistance to change in angular motion.

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2. What’s the frictional force on the 20.0 kg box if the coefficient of kinetic friction is 0.700? Assume the applied force causes the object to be moving? a) 196.2 N b) 137.3 N c) 20.0 N d) 14.00 N

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3. What’s the acceleration of the 20 kg box if the coefficient of kinetic friction is 0.700 and the applied force is 300 N? Assume the object is moving. a) 15.00 m/s 2 b) 9.81 m/s 2 c) 8.13 m/s 2 d) 162.7 m/s 2

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4. What is the angular acceleration caused by a frictional force of 200 N on a runner whose centre is 95.0 cm above a level runway if her moment of inertia is 12.00 kg.m 2 ? (Ignore the vertical force.) a) –16.67 rad/s 2 b) –2400 rad/s 2 c) –190.0 rad/s 2 d) –15.83 rad/s 2

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5. What is the moment of inertia about its centre of gravity of a 7.5 kg thigh if the thigh’s length is 35 cm and its radius of gyration is 50% of the length? a) 0.230 kg.m 2 b) 1.313 kg.m 2 c) 2.63 kg.m 2 d) 0.919 kg.m 2

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6. What happens when a resultant force’s line of action passes through the centre of gravity of a body? a) object will continue moving at constant velocity b) object will accelerate in the direction of the force with no change in spin c) object will accelerate linearly and angularly

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Correct answers 1)d(resistance to ang. motion) 2)b(=20.0 x 9.81 x 0.70) 3)c(=300 – 137.3) 4)d(=[200 x 0.95] /12) 5)a(=7.5 x (0.35 x 0.50) 2 ) 6)b(linear acceleration only)

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