Phy 213 Quiz 5 Pre lim 3 Force 2 Oct 23, 2006

1. A 20 kg mass is pulled along on a horizontal plane by a horizontal force of 50 N. The coefficient of kinetic friction between the plane and the mass is 0.2 . What is the acceleration of the mass?

2. An object slides down a plane whose incline makes an angle of 53° with the horizontal. It's acceleration down the plane is 4 m/s². What is the coefficient of kinetic friction ?

3. A 30 kg object is pushed along a horizontal surface at constant speed by the force indicated. The coefficient of kinetic friction between surfaces is 0.3 . What is the magnitude of the force F ?