Hello, Can you help me with the following questions?. Thank you

Part A: a) Define statics and torque. Mention the two condition for equilibrium. b) What can you say about the velocity of moving body that is in dynamic equilibrium?

Part B:

The See-Saw problem: Question 1. A 40kg child sits on a seesaw 3 meters away from the pivot point. The mass of the bar is 10kg. Where should a 30kg child sit to balance the seesaw? What is the Normal Force exerted by the pivot point?

Question 2. Two children of mass 20.0 kg and 30.0 kg sit balanced on a seesaw with the pivot point located at the center of the seesaw. If the children are separated by a distance of 3.00 m, at what distance from the pivot point is the small child sitting in order to maintain the balance?

part c:

Question 3. A uniform ladder 5.0m long and weighs 400N. The ladder rests against a slippery vertical wall as shown below. The inclination angle between the ladder and the rough floor is 53o . Find the reaction force from the wall on the ladder.

Question 4. A 20kg uniform ladder of 2.5m long rests against a smooth wall at angle of 60o with horizontal. Calculate the forces on ladder exerted by floor and wall.