Question 1

Calculate the acceleration of a snow-boarder going down a  slope inclined at $40^{0}$ assuming the coefficient
of kinetic friction for waxed wood on wet snow is 0.3.

Accepted Answer

$4.05ms^{-2}$

Answer

$3.05ms^{-2}$

Answer

$1.05ms^{-2}$

Answer

$2.05ms^{-2}$

Question 2

A freight train has  a mass of of $4	imes10^{5}$kg. 
What force must the engine exert to accelerate the train at a rate of $0.05ms^{-2}$
if the force of friction is $30,000$N when moving?

Accepted Answer

50,000N

Answer

60,000N

Answer

40,000N

Answer

30,000N

Question 3

A freight train has  a mass of of $4	imes10^{5}$kg.  If the force of friction is $30,000$N when moving what is the coefficient of kinetic friction between the train and the track?

Accepted Answer

0.075

Answer

0.085

Answer

0.065

Answer

0.095

Question 4

The minimum force needed to move a wooden crate, whose mass is 80kg, on a wooden surface is 500N. 
Find the coefficient fo static friction for wood on wood.

Accepted Answer

0.64

Answer

0.34

Answer

0.54

Answer

0.44

Question 5

Find the coefficient of static friction for the object shown

Accepted Answer

0.675

Answer

0.747

Answer

0.574

Answer

0.474

Question 6

For the diagram shown find the resultant force down the slope

Accepted Answer

192.8N

Answer

172.8N

Answer

182.8N

Answer

162.8N

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