1. A 400 N box is pushed up a 5m long ramp to a height of 2m. 300N of force are used when the person pushes the box. Calculate the Mechanical Efficiency of this ramp. And how much energy is wasted as friction?
2. A 800 N crate is pushed up a 7m long ramp to a height of 3m. 450 N of force are used when the person pushes the crate. Calculate the ME of this ramp. And how much energy is wasted as friction?
3. What are 2 ways to improve the efficiency of a machine?
4. What is a lubricant?
5. Is it possible to have a "perfect" machine with no friction? Why?
Practice Questions!
1. A 400 N box is pushed up a 5m long ramp to a height of 2m. 300N of force are used when the person pushes the box. Calculate the Mechanical Efficiency of this ramp. And how much energy is wasted as friction?
2. A 800 N crate is pushed up a 7m long ramp to a height of 3m. 450 N of force are used when the person pushes the crate. Calculate the ME of this ramp. And how much energy is wasted as friction?
3. What are 2 ways to improve the efficiency of a machine?
4. What is a lubricant?
5. Is it possible to have a "perfect" machine with no friction? Why?
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