Physics Newton's

C. Bires, revised 10/2014 Simulations at http://phet.colorado.edu/ Name: Conclusion Calculations: GRADED Back to the cabinet (| Reset ). u = 0.30 Complete the table below. You may check your answers in the simulation. Force Applied is the force required (by you for instance) to make the cabinet move at a constant velocity in either direction or keep it from accelerating (if applicable). Recall... constant velocity = net force. Also note: force applied may change direction as the angle increases! Angle, 0 Mass Weight g = 9.8m/s2 Normal Force, Fn Force parallel F/ Friction Force Fr Force Applied, Fa 0.00 100. kg 0.00 N 10.00 100. kg 2 . 20.00 100. kg 3. 30.0 100. kg 4 . 40.0 100. kg 5 . 50.0 100. kg 6. 60.0 100. kg 7. 70.0 100. kg 8 . 80.0 100. kg 9 . 90.0 100. kg 0.00 N 10 . Conclusion Questions: 1. On a horizontal plane, the force equals the 2. As the angle of the ramp is increased, the normal force increases / decreases / remains the same and the friction force increases / decreases / remains the same. 3. As the angle of the ramp is increased, the force parallel increases / decreases / remains the same. 4. The angle at which the force down the plane became just slight larger than the force of friction (for the cabinet in step #6) was Normal 5. Consider a very low (zero) friction, 5.0 kg skateboard on a ramp at an angle of 150 to the horizontal. What would be the net force that would cause acceleration when Friction the skateboard is allowed to move?_ N 6. What would be the skateboard's acceleration down the plane? m/s Weight 7. Now consider the same no-friction 5.0 kg skateboard on the same 150 ramp. If a 45kg teenager jumps on, what would be her acceleration down the ramp? m/s 8. magine you are pushing a 15 kg cart full of 25 kg of bottled water up a 10 ramp. 9. If the coefficient of friction is 0.02, what is the friction force you must overcome to push the cart up the ramp? N 10. Realizing that there is also a force parallel (as a component of weight) you must ALSO overcome, what is the TOTAL force you must apply to push the cart up the ramp at a constant speed? N