QUESTION 5 (Start on a new page.)
A crate, with a mass of 25 kg, slides down a plane which is inclined at 15° to the
horizontal. During the first part of the motion, from A to B, there is no friction between
the crate and the plane, but part BC has a rough surface.
5.1
5.2
5.3
5.4
A
25 kg
B
15⁰
Draw a free-body diagram of ALL the forces acting on the crate while it moves
from B to C.
Calculate the magnitude of the acceleration of the crate while it moves from A
to B.
Write down the direction of the acceleration of the crate while it slows down
from B to C. Write only UP THE SLOPE or DOWN THE SLOPE.
The magnitude of the net acceleration from B to C is 1,2 m-s¹². Calculate the
magnitude of the frictional force acting on the crate.
(3)
(4)
(1)
(4)
[12]
