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Newton’s Laws Virtual Lab Mass of Filing Cabinet (5 Points) 50 kg Maximum Force of Friction (5 Points) -245 N Data Table I Filing Cabinet with Friction (20 Points) Acceleration Applied Force Friction Force Total Force Calculated Force 0.5m/s 2 0 0 0 F=(50)(.5) 25 N 1.0m/s 2 36.75 N -98 N -61.25 N F=(50)(1) 50 N 1.5m/s 2 26.32 N -98 N -71.68 N F=(50)(1.5) 75 N 2.0m/s 2 0 N -98 N -98 N F=(50)(2) 100 N Sample Calculated – Calculated Force on the Filing Cabinet (7 Points) force = (m)(a) force= (50)(.5) force= 50N Mass of Dog (5 Points) 25 kg Data Table II Dog with Friction (12 Points) Acceleration Applied Force Friction Force Total Force 0.5m/s 2 19.4N -9.2N 10.2N 1.0m/s 2 36.8N -15.3N 21.5N 1.5m/s 2 56.8N -21.4N 35.4N 2.0m/s 2 74.9N -24.5N 50.4N Data Table III Dog without Friction (6 Points) Acceleration Applied Force Friction Force Total Force 0.5m/s 2 12N 0 12N 1.0m/s 2 24.1N 0 24.1N

1.5m/s 2 30.1N 0 30.1N 2.0m/s 2 49.5N 0 49.5N Observations and Questions (30 Points) 1. As the force is increases what happens to the friction? Before the object begins to move, the frictional force and applied force is equal. As the force increases the friction gets stronger which allows the object to accelerate. But after the object begins to move, the friction force weakens. 2. Record your observation of what happens when the maximum force of friction is reached. When the maximum force of friction is reached the object accelerates 3. Which force, Applied, Friction, or Total is the same as the equation F=ma? None of them were the same as the equation F=ma, however; Total force was the closest to F=ma. 4. As the filing cabinet is moving to the right, while holding down the mouse click to continue to apply a force, try to hold the mouse over the filing cabinet to adjust the net force to zero. What happens to the filing cabinet as you do this? When the frictional force and applied force is equal the acceleration is 0. This allowed me to think that the overall force is 0 because of F=ma. Also the velocity stayed constant. 5. Release the mouse button, which stops applying a force. Describe the motion of the cabinet. The cabinet slows down and comes to a stop. This is because of Newton's First Law of Motion. 6. How does the net force change with this smaller mass? The net force changes with a smaller mass by the force being less. This is because of the equation F=ma, so if mass decreases force also decreases. 7. With the friction turned “OFF”, set the object in motion and then stop apply a force. Describe the motion of the object.