1) A man places a ladder against a wall. He then climbs up the ladder. Briefly describe the forces acting on the man, on the ladder & on the wall?
- On the man: gravitational force & frictional force?
- On the ladder: gravitational force & frictional force?
- On the wall: frictional force?
2) Concrete floor, marble floor and school field. Which has the most frictional force & which has the least?
Least: marble floor?
Most: concrete floor?
1) All answers are wrong.
If you needed friction to stay on a ladder, you'd be in trouble.
Isn't the man staning on the ladder?
You can't have a friction force without a normal force
2) A agree with marble having the least friction. Is it easier to slide on a concrete surface or an athletic field? Which surface is roughest?