The energy wasted is the rest of the percentage from the answer/ mechanical efficiency
Thermal/heat energy is what input energy is wasted on because of friction
1. A cart that weighs 335N is pulled up to a vertical height of 4m through a distance of 12m and the force applied was 200N. What is the efficiency of this machine?
A) 10%
B) 92%
C) 67%
D) 70%
2. It takes 350N to push a box up a 10m inclined plane with a height of 6m. The force of gravity acting on the box is 400N. What is the efficiency of the machine. (you may round your answer) A) 68%
B)32%
C)78%
D)40%
3. A boy uses a lever to lift box to a height of 1m. He exserts 800N of force to move his end of the lever 2m. The box weighs 1200N. What is the efficiency?
A) 64%
B) 11%
C) 22%
D) 75%
4. A man uses a ramp to push a 500N box 7m up a ramp. He uses a force of 340N and a distance of 13m. What is the percentage of energy wasted?
A) 56%
B) 78.4%
C) 10%
D) 21%
Here are links to my other pages
Home Page~ Work Input-Work Output~ Friction~ Calculating ~ Practice-Quiz Answer~ Bibliography~
Here is a page for extra practice if you need it.
REMEMBER:
1. A cart that weighs 335N is pulled up to a vertical height of 4m through a distance of 12m and the force applied was 200N. What is the efficiency of this machine?
A) 10%
B) 92%
C) 67%
D) 70%
2. It takes 350N to push a box up a 10m inclined plane with a height of 6m. The force of gravity acting on the box is 400N. What is the efficiency of the machine. (you may round your answer)
A) 68%
B)32%
C)78%
D)40%
3. A boy uses a lever to lift box to a height of 1m. He exserts 800N of force to move his end of the lever 2m. The box weighs 1200N. What is the efficiency?
A) 64%
B) 11%
C) 22%
D) 75%
4. A man uses a ramp to push a 500N box 7m up a ramp. He uses a force of 340N and a distance of 13m. What is the percentage of energy wasted?
A) 56%
B) 78.4%
C) 10%
D) 21%
5. What is the definition of friction?
Here is a link to a PDF page for extra practice on Calculating efficiency.......
http://arapahoe.littletonpublicschools.net/LinkClick.aspx?fileticket=ni8UXXzgje8%3D&tabid=1928