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Download Practice Problems 1. A water skier has a mass of 79 kg and
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Transcript
Practice Problems 1. A water skier has a mass of 79 kg and accelerates at 1.4 m/s2. What is the net force acting on him? m=79 kg a=1.4 m/s2 Fnet? F=ma F=79x1.4 = 110.6N 2. What is the mass of an object if it takes a net force of 32 N to accelerate it at a rate of 0.88 m/s2? F=32 N ⁄ ⁄ a=0.88 m/s2 m? 3. A net force of 15N is applied to a cart with a mass of 2.1 kg. a. What is the acceleration of the cart? ⁄ ⁄ ⁄ b. How long will it take the cart to travel 2.8m, starting from rest? Using accelleration above, apply kinematic equation K2: √ 4. What is the acceleration of a box weighing 665 N, sitting on a frictionless counter, if a force of 777 N is horizontally applied to it? (Only the horizontal force causes the acceleration) First we can calculate the mass of the box because we know that, W=mg. We can then apply N2 to solve for acceleration. 5. A car has a mass of 820 kg. It starts from rest and travels 41 m in 3.0 s. What is the net force applied to the car? First solve for accleration using K2 Then apply N2, F=ma 6. What will be the final velocity of a 0.005 kg bullet starting from rest, if a net force of 45 N is applied over a distance of 0.80 m? Use N2 to solve for acceleration: F=ma Then apply K3 to solve for final velocity. √ 7. A box with a weight of 22N is pulled across a frictionless surface by a rope 43° from the horizontal surface. DISREGARD THIS PROBLEM - HAVEN’T LEARNED YET 8. Find the magnitude and direction of the equilibrant force for these two concurrent forces; 13.5 N, east and 32.0 N, north? DISREGARD THIS PROBLEM - HAVEN’T LEARNED YET 9. A person pulls a rake with 152 N of force along the handle. The angle between the handle and the ground is 35.0º. Determine the magnitudes of the horizontal and vertical components of this force. 152 N X 152Nxcos35°=124.5N Y 152Nsin35°=87.2N 10. A child pulls a wagon along level ground. The handle which she pulls the wagon makes an angle of 20.0º with the ground as the child pulls with a force of 78.0 N. What are the components of this force? 78 N X 78Nxcos20°=73.3N Y 78Nsin20°=26.7N 11. What is the mass and weight of a 75kg astronaught on the moon (gmoon= 1.6 m/s2) Mass ____75kg______ Weight: _____120N______