Forces and acceleration

Question 1

fWhat is newtons second law in maths?

Answer 1

resultant force = mass X acc.

Question 2

how do you do an F = ma calculation with vectors?

Answer 2

keep them in vector form and just use two lines of working to establish F, m and a for both horizontal and vertical components

Question 3

what direction does friction act in reference to force/motion?

Answer 3

always acts against motion or against potential motion

Question 4

what is Fmax?

Answer 4

limiting frictional force, and if the object is said to be on the point of moving it is said to be in limiting equilibrium

Question 5

what does Fmax depend on?

Answer 5

size of normal contact force, R and the roughness of the surface; the coefficient of friction for the surfaces in contact

Question 6

equation linking Fmax and μ (coefficient of friction)?

Answer 6

Fmax = R * μ
μ is t6always between 0 and 1

Question 7

how do you find friction acting on a body on a slope?

Answer 7

resolve forces into parallel and perpendicullar to slope, resolve the perpendicullar to find R first and then use this value multiplied by μ to give max friction. this can then be equated into the parallel resolution to find the frictional force acting on body as a result of other forces