Physics Quiz: Forces and Equilibrium

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Questions and Answers

A force is applied at an angle to the horizontal. What are the horizontal and vertical components of the force?

The horizontal component is zero when the force is perpendicular to the horizontal

The horizontal component is maximum when the force is parallel to the horizontal

The horizontal and vertical components are equal when the force is at 45 degrees to the horizontal (correct)

The vertical component is maximum when the force is perpendicular to the horizontal

What is a scalar quantity in physics?

Force

Velocity

Acceleration

Displacement (correct)

What is the force exerted by a body against a surface in contact with it called?

External force

Equilibrant force

Resultant force

Reaction force (correct)

Which of the following is NOT a method for resolving forces?

Moment method Signup and view all the answers

When is a body in equilibrium?

When the sum of the forces and moments is zero Signup and view all the answers

What is true about a body in equilibrium?

It may be in translational or rotational motion Signup and view all the answers

When is the moment of a force about a point minimum?

When the force acts perpendicular to the point Signup and view all the answers

What is true about the moment of a couple?

It is the same about all points Signup and view all the answers

What is the normal force acting on a block on a frictionless surface when a force of 100 N is applied horizontally?

100 N Signup and view all the answers

What is the equilibrant of a system of parallel forces?

The force needed to maintain equilibrium Signup and view all the answers

What is the condition for a body to be in translational equilibrium?

All of the above Signup and view all the answers

What is the magnitude of the resultant force of two forces of 10 N and 15 N acting at right angles to each other?

20 N Signup and view all the answers

Which of the following is NOT a unit of moment?

Joule Signup and view all the answers

What is the principle of moments?

The clockwise moments equal the counterclockwise moments about any point Signup and view all the answers

What is the definition of a force?

A push or pull acting on an object Signup and view all the answers

What is the unit of force in the International System of Units (SI)?

Newton (N) Signup and view all the answers

Study Notes

Forces and Equilibrium

A force can be transferred along its line of action without changing its effect on a body.
The horizontal and vertical components of a force can be calculated using trigonometric methods.
Displacement is a scalar quantity.

Types of Forces

Reaction force: the force exerted by a body against a surface in contact with it.
Resultant force: the sum of all forces acting on a body.
Equilibrant force: the force needed to maintain equilibrium.

Equilibrium

A body in equilibrium may be in translational or rotational motion.
The sum of the forces and moments about any point is zero for a body to be in equilibrium.
Conditions for a body to be in translational equilibrium: ∑Fx = 0, ∑Fy = 0, and ∑Fz = 0.
The moment of a force about a point is minimum when the force acts perpendicular to the point.

Moments

The moment of a force about a point is the product of the force magnitude and the distance from the point to the line of action of the force.
The moment of a couple is the same about all points.
A couple is formed by two parallel forces with the same magnitude but opposite direction.

Units of Force and Moment

The unit of force in the International System of Units (SI) is the Newton (N).
The unit of moment is the Newton-meter (N-m).

Resolving Forces

The graphical method, analytical method, and trigonometric method can be used to resolve forces.
The moment method is not a method for resolving forces.

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Description

Test your understanding of forces and equilibrium with these multiple-choice questions. Covers concepts like applied forces, normal forces, and systems of parallel forces.