What is the unit of a moment?
Newton (N)
Newton per metre (N/m)
Newton metre (Nm)
What name is given to the shortest distance between a line of action of a force and the pivot?
Rotational distance
Perpendicular distance
Parallel distance
What is the moment of a 6 N force acting 1.5 m from a pivot?
9 N/m
4 Nm
9 Nm
The moment of a force is 24 Ncm. What size is the force if it acts 8 cm from the pivot?
0.3 N
3 N
72 N
What is the principle of moments?
Total clockwise force = total anticlockwise force
Total clockwise moment = total anticlockwise moment
Total clockwise energy = total anticlockwise energy
Two identical weights are attached to opposite ends of a beam. Both are 1 m from the pivot. What happens if the right-hand weight is moved closer to the pivot?
The beam rotates clockwise
The moment of the left-hand weight decreases
The beam rotates anticlockwise
Which of the following is the correct definition of the centre of gravity?
The centre of gravity is the point through which the weight of an object appears to act for any orientation of the object
The centre of gravity is the point at the middle of all objects
The centre of gravity is the point through which the mass of an object appears to act for any orientation of the object
Which of the following is not required for an object to be stable?
The object should have a wide base
The object should have a low centre of gravity
The object should have a narrow base
A vase of flowers is found to be unstable. Which of the following will make it more stable?
Remove the water from the vase
Put some stones in the bottom of the vase
Replace the flowers with ones with longer stems
Which of the following statements about toppling over is false?
An object will topple over if its centre of gravity is inside its base
An object will topple over if its centre of gravity is outside its base
An object will topple over easily if it has a high centre of gravity