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Kahoot Question 1 • A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that Question 1 Answer • A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that • a frictional force is acting on it. Question 2 • A toolbox, of mass M, is resting on a flat board. One end of the board is lifted up until the toolbox just starts to slide. The angle θ that the board makes with the horizontal for this to occur depends on the Question 2 Answer • A toolbox, of mass M, is resting on a flat board. One end of the board is lifted up until the toolbox just starts to slide. The angle θ that the board makes with the horizontal for this to occur depends on the • coefficient of static friction, μ. • Hint: The acceleration of gravity, g, cancels out. Question 3 • To avoid slipping while walking on ice, one should take smaller steps because of the Question 3 Answer • To avoid slipping while walking on ice, one should take smaller steps because of the • Friction of ice is small Question 4 • A force of 98 N is required to just start moving a body of mass 100 kg over ice. Calculate the coefficient of static friction. Question 4 Answer • A force of 98 N is required to just start moving a body of mass 100 kg over ice. • The coefficient of static friction is 0.1 • Use the equation for friction and make sure the mass is converted to a force. Question 5 • Which of the following statements is not true? 1. The force of friction acts opposite to the applied force 2. Rolling friction is greater than sliding friction 3. The coefficient of friction between wood&wood is less than 1 Question 5 Answer • Which of the following statements is not true? Rolling friction is greater than sliding friction Question 6 • When there is no relative motion between two surfaces, the force Question 6 Answer • When there is no relative motion between two surfaces, the force • exerted by one surface on the other is static friction force Question 7 Question 7 Answer • 31 N • Force of Friction = 40 kg x 9.8 m/s/s x 0.08 N Question 8 Question 8 answer Kinetic friction force Question 9 Question 9 Answer 110 N - take coefficient times the normal force Question 10 Question 10 Answer Question 11 Question 11 answer Question 12 Question 12 answer equilibrant Question 13 Question 13 answer Question 14 Question 14 answer Question 15 Question 15 Question 16 Question 16 answer Question 17 • The resultant between 2 vectors can be found by placing the vectors Question 17 answer • The resultant between 2 vectors can be found by placing the vectors • Tip to tail Question 18 • Equilibrium can occur Question 18 answer • Equilibrium can occur • only if the sum of the forces is zero. Question 19 • The normal force on an object always act Question 19 answer • The normal force on an object always act • perpendicular to the surface upon which object is resting.