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- Zeroth Law of Thermodynamics
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Friction and Circular Motion
Question 1
A system of concurrent forces is in equilibrium when:
- A
All forces are equal in magnitude
- B
The vector sum of all forces equals zero (ΣF = 0)
- C
All forces act in the same direction
- D
The net force is maximum
Question 2
A book resting on a table is an example of:
- A
Dynamic equilibrium
- B
Static equilibrium
- C
Unstable equilibrium
- D
No equilibrium
Question 3
For coplanar concurrent forces to be in equilibrium, which condition must be satisfied?
- A
ΣFx = 0 only
- B
ΣFy = 0 only
- C
Both ΣFx = 0 AND ΣFy = 0
- D
Either ΣFx = 0 OR ΣFy = 0
Question 4
Static friction is the friction that acts:
- A
Only on moving objects
- B
Between two surfaces in relative motion
- C
Between two stationary surfaces before motion begins
- D
Only after kinetic friction stops
Question 5
The coefficient of static friction (μs) is defined as:
- A
Frictional force divided by applied force
- B
Normal force divided by weight
- C
Applied force times normal force
- D
Ratio of maximum static friction to normal force (F/N)
Question 6
Which statement about static and kinetic friction is always true?
- A
Static friction is greater than kinetic friction
- B
Kinetic friction is greater than static friction
- C
Their relationship depends on velocity
- D
They are always equal
Question 7
Kinetic friction is independent of:
- A
The normal force
- B
The velocity of the object (for reasonable speeds)
- C
The nature of the surfaces
- D
The area of contact
Question 8
In a tug-of-war game, when both teams apply equal forces in opposite directions, the rope is in equilibrium. This demonstrates:
- A
Newton's First Law only
- B
Newton's Third Law only
- C
Equilibrium of concurrent forces (ΣF = 0)
- D
Kinetic friction principle
There are 8 questions to complete.