1. A force of 175 N is needed to keep a 640-N stationary engine on wooden skids from sliding on a wooden floor. What is the coefficient of static friction?
2. A crated garden tractor weighs 375 N. What force is needed to start the crate sliding on a wooden floor when the coefficient of static friction is 0.40?
3. Find the acceleration of a forklift of mass 1400 kg pushed by a force of 2100 N that is opposed by a frictional force of 425 N.
4. What is the weight of a 375-kg air compressor?
5. What is the mass of a 405-N welder?
6. What is the mass of a 12.0-N hammer?