Question

renced Reviequestions 120. Each of the following diagrams shows a different block being pushed to the right by a horizontal force across a horizontal surface at constant velocity. 6 kg 2 kg Polished wood Rough wood 116. An empty wooden crate slides across a warehouse floor. If the crate was filled, the coefficient of kinetic friction between the crate and the floor would (1) decrease (2) increase (3) remain the same 117. An empty wooden crate slides across a warehouse floor. If the crate was filled, the magnitude of the force of kinetic friction between the crate and the floor would (1) decrease (2) increase (3) remain the same 118. As an object initially at rest on a horizontal surface is set in motion, the magnitude of the force of friction between the object and the surface (1) decreases (2) increases (3) remains the same 119. As a thrown baseball is acted on by air friction, the thermal energy of the ball (1) decreases (2) increases (3) remains the same 2 kg 4 kg 2N Smooth wood Glass In which two diagrams is the force of friction the same? Topic 2: Mechanics 55

Answer 1

We know that coefficient of kinetic friction is independent of mass of object. It is just a number which represent the friction between two material. Thus it will remain same.