3B Scientific Basic Mechanics Kit - Manual (Page 2)

Mechanics / Experiment 7 Work sheet 3B STUDENT Kit
2
Measurement table:
Friction block
with weight
Trolley with wheels
and weight
Tensile force in N 1.30 0.06
Analyze and explain the observations
a) Compare the tensile forces that need to be applied to the friction block and to the trolley before they just
begin to move.
The tensile force needed is much lesser in the case of the trolley with wheels than in the case
of the friction block.
b) What is meant by the force of rolling friction?
The force of rolling friction is the force that opposes the movement of a body that rolls on
wheels over a surface. It is the force that has to be applied to sustain the rolling motion.
c) What happens if the tensile force that is applied to the rolling trolley is withdrawn?
The motion of the trolley will be decelerated by the action of the force of rolling friction, till
it comes to rest.