Chapter Summary Questions

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Chapter Summary Questions

Question 1

Consider the figure below to represent the teeter-totter loaded with the two children, that is 30kg

child and the 45 kg child who weight are 300N and 450N respectively (Assuming g=10N/kg)

300N 450N

1.5m 1.5m

Assuming that the teeter-totter is pivoted at the center, the moment due to the forces above will

be calculated about the center. For the teeter-totter to be equilibrium;

Sum of clockwise moments  Sum of anticlockwise moments

      

  

  

Therefore, the child will sit 1m from the middle of the teeter-totter (pivot)

Question 2

No child weighing less than 30 kg could obtain perfect balance with the first child. This is

because at no point along the teeter-totter will the moment of child whose weight is less than 30

kg be equal to 450Nm. 450Nm is the moment cause by the 30kg child (    )

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Question 3

Consider the figure below showing the direction of the swimmer and that of the current.

2m/s (Swimmer)

R (Resultant Velocity)

0.5 m/s (Current)

Using Pythagoras theorem the resultant velocity R is given as follows;

 







 



 

Question 4





  



 

a) Total angular distance

Angular distance for 1 squat  



 



     

Total angular distance for 10 squats      

b) Total Angular displacement

Assuming the knee angle was finally at 95

after the 10 squats, the total angular displacement is

given by;

Total Angular displacement  



 



     

Question 5

Applying Newton’s second law;

FMa

   

 

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