10 minutes maximum! Can you do it in 5?

1. Which one of these is the correct formula for calculating a moment?
 A. moment = force ÷ distance (at rightangles to force)^{}
 B. moment = force x distance (at rightangles to force)^{}
 C. moment = mass x velocity
 D. moment = mass ÷ velocity


2+3. A 5N box is placed on the lefthand side of a light beam as shown:
2. What is the moment produced by the box? 
 A. 10 Nm clockwise.
 B. 2.5 Nm clockwise.
 C. 10 Nm anticlockwise.
 D. 2.5 Nm anticlockwise.


3. A second box of weight 10 N is added to the beam. Where should it be placed to make the beam balance?
 A. 0.25 m to the right of the pivot.
 B. 1 m to the right of the pivot.
 C. 0.25 m to the left of the pivot.
 D. 1 m to the left of the pivot.


4. A door handle is 0.2 m long and needs a moment of 4 Nm to turn the handle and open the door. What is the minimum force that needs to be applied to the end of the handle to open the door?
 0.8 N
 0.05 N
 8 N
 20 N


5&6. This beam has 2 weights suspended from it. However it is not balanced.

5. What is the resultant moment on he beam?
 2 N anticlockwise
 8 Ncm anticlockwise
 2 N clockwise
 8 Ncm clockwises


6. To make the beam balance, how far should the 8N weight be to the right of the pivot?
 6 cm
 9 cm
 10 cm
 12 cm


710. These questions are about a seesaw.
When different children sit on the seesaw they find they have to move to different points to make the seesaw balance.
What are the missing values needed to make the seesaw balance?
Left Hand Side 
Right Hand Side 
Name 
weight (N) 
distance from pivot (m) 
Name 
Weight (N) 
distance from pivot (m) 
Abby 
600 
1.5 
Charlie 
900 

Borat

750 

Elin 
450 
2 
Doris 

2.1 
Fred 
570 
1.4 

? 
1.6 
Goh 
400 
2.4 

