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WorksheetsStatics_Friction and Inertia
Total questions: 25
Worksheet time: 19mins
The frictional force in the belts always acts ____________ to the surface of the application of the friction.
Tangential
Perpendicular
Normal
Parallel
Calculate the X-axis and Y-axis components of the vector shown in the figure that has a length of 3m and the angles shown A and B of 60 and 30 degrees each.
2.59m and 1.50m respectively
1.50m and 2.59m respectively
3cos60 and 3sin30 respectively
3sin60 and 3sin30 respectively
Dry friction in the belt is also called
Coulomb Friction
Surface Friction
In the simplification of the forces for the free body diagram, the net force acts at the ___________ of the loading body.
Center
Centroid
Base
As in the determination of the various unknown forces in the free body diagram involves the use of vectors. So one of the vector law is commutative law and it is valid for the cross product of two vectors. (Commutative law: PxQ = QxP; for two vectors P and Q)
True
False
For equilibrium, the normal forces act in which direction in the free body diagrams if they are constructed for the friction part calculations?
Vertically Upward
Vertically Downward
Horizontally Right
Horizontally Left
Calculate the Normal force developed between the body and the surface.
611N
116N
100N
180N
The frictional force is directly proportional to the surface of the solid.
True
False
A ____________ is a simple machine that is used as to transfer applied forces into much larger forces.
Wedge
Beam
Pillar
Pencil
Wedges are used to transfer heavy loads.
True
False
The normal force exerted by the surface of the wedge is normal to the surface of the ________
Base of the wedge
Base of the body residing over it
Base of the body just neighbour to the wedge
Earth’s surface
In the free body diagrams involving the wedges we have use of vector math, so for two vectors A and B, what is A.B (if they have angle α between them)?
|A||B| cosα
|A||B|
√(|A||B|) cosα
|A||B| sinα
What is j.j?
infinity
1
0
-1
Whenever the distributed loading acts perpendicular to an area its intensity varies __________
Linearly
Non-Linearly
Parabolically
Cubically
The calculation of the moment of the body due to the loadings involve a quantity called ____________
Moment
Inertia
Rotation
Moment of Inertia
Moment of Inertia is the integration of the square of the distance of the centroid and the del area along the whole area of the structure.
True
False
There is perpendicular axis theorem for the area.
True
False
What is parallel axis theorem and to whom it is applied?
Theorem used to add the two mutually perpendicular moment of inertias for areas
Theorem used to add the two mutually perpendicular moment of inertias for volumes
Theorem used to add the two mutually perpendicular moment of inertias for linear distances
Theorem used to add the two mutually perpendicular moment of inertias for vectors
The parallel axis theorem gives the moment of inertia ______________ to the surface of considerance.
Linear
Non-linear
Perpendicular
Parallel
The parallel axis theorem can add any angle varied moment of inertias to give the perpendicular moment of inertia.
True
False
The parallel axis theorem uses the ____________ of the distance.
Square root
Square
Cube
Cube root
A body’s all small particles have a small weight which is being applied by them to the body, which adds up to the total weight of the body.
true
false
We use sometimes the measures to know the direction of moment in the calculations of the centre of mass. It is done by right handed coordinate system. Which is right about it(consider the mentioned axis to be positive)?
Thumb is z-axis, fingers curled from x-axis to y-axis
Thumb is x-axis, fingers curled from z-axis to y-axis
Thumb is y-axis, fingers curled from x-axis to z-axis
Thumb is z-axis, fingers curled from y-axis to x-axis
Determine the y coordinate of centroid of the wire in the shape of circle as shown.
2R/π
2/π
2R/5
2R/3
How far from the shaft at P a 200N vertical force must act so as to create the same moment as produced by the 75N, at P?
1.2m
1.125m
0.6m
0m
