E.Mech - Statics of Particles

Which of the following is a scalar quantity?

• Force

• Weight

• Mass

• Acceleration

What is the principle of transmissibility of forces?

• Forces can only act at their points of application.

• Forces can be transmitted along their line of action without changing their external effect.

• The sum of forces on a body must be zero.

• Forces are independent of their line of action.

Lami's theorem is applicable only when:

• Three forces act on a particle.

• The forces are coplanar and concurrent.

• The particle is in equilibrium.

• All of the above.

The unit of force in the SI system is:

• Kilogram

• Newton

• Joule

• Dyne

Which of the following is not a law of mechanics?

• Newton's First Law

• Lami's Theorem

• Parallelogram Law

• Coulomb's Law

The triangular law of forces states that:

• Two vectors can be represented by a triangle if placed tail to tail.

• Two vectors can be represented by a triangle if placed head to tail.

• Two vectors always form a right-angled triangle.

• The two vectors must have the same magnitude.

A force can be completely resolved into:

• Two perpendicular components.

• Three concurrent forces.

• Coplanar components.

• Parallel forces.

Which of the following methods can be used to find the resultant of two forces?

• Parallelogram Law

• Lami's Theorem

• Resolution of Forces

• All of the above

For equilibrium of a particle under coplanar forces, the sum of forces in the x-direction and y-direction must:

• Be maximum

• Be minimum

• Equal zero

• Be equal to one another

If a force vector is represented as F = 5i + 3j + 4k, the magnitude of the force is:

• √50

• 5

• √42

• 6