HElp pleasee with friction, force, equilibruim!!?

Question

a force that puts an object at equilibruim is ________

When does frictional force occur?

It takes a minimuum force of 280 N to move 50 kilo crate. Whats the coefficent of maximum static friction between the crate and floor?

Force created when you re pushing something at rest, you must overcome, ____to move object.(the name of that force?)

static frictional force is _____________
angle of resultant vector is _____________
kinnetic frictional force is _____________

thanks!

Answer 1

Q1. Equillibriant
Q2 The frictional force force occurs when there is any relativistic motion between any two surfaces .
It's types:1.Static friction (At rest and just at the urge to start)
2. Dyanamic(on moving )
3. Limiting (when Tends To come in rest)
Q3. 280/50=5.6 Ans=5.6
Q4.Static Friction
Q5. Frictional force acting between the surface and body when the body is just at the urge to start moving .
Q6. Angle which the resultant makes with any of the forces = Psin@/q+Pcos@ with Q
where P,Q are the forces and @ is angle between Pand Q
Q7. The frictional force acting during the motion of the body also known as" dynamic friction " It is the minimum in magnitude than other two frictional forces.