Contact and field forces Knowledge-Based Download PDF

Questions

1. 1.

   At the microscopic level, common contact forces such as friction, tension, and the normal force arise primarily from which type of field interaction?

   • A) Gravitational attraction between the masses of adjacent atoms
   • B) Strong nuclear forces binding nucleons within atomic nuclei
   • C) Weak nuclear interactions occurring during subatomic particle decay
   • D) Electromagnetic interactions between charged particles in the touching surfaces
2. 2.

   Which of the following correctly pairs a force with its proper classification and interaction requirement?

   • A) Gravitational force: classified as a contact force that requires physical touch between masses
   • B) Magnetic force: classified as a contact force that requires touching surfaces to attract or repel
   • C) Tension force: classified as a field force that acts across empty space without a physical medium
   • D) Normal force: classified as a contact force that acts perpendicularly only when surfaces are in direct physical contact
3. 3.

   Which of the following forces can exert a repulsive force between two objects separated by a distance without physical contact?

   • A) Gravitational force
   • B) Tension force
   • C) Normal force
   • D) Electrostatic force
4. 4.

   Which of the following statements correctly describes a fundamental difference between contact forces and field forces?

   • A) Contact forces can transmit pushes or pulls across a vacuum, whereas field forces require a physical medium to propagate.
   • B) Field forces can act over a distance without physical contact, whereas contact forces require direct physical touching between objects.
   • C) Contact forces depend solely on the masses of interacting objects, whereas field forces depend only on surface textures.
   • D) Field forces are always repulsive between interacting bodies, whereas contact forces can be either attractive or repulsive.
5. 5.

   Which of the following pairs consists exclusively of contact forces?

   • A) Tension force and friction force
   • B) Gravitational force and normal force
   • C) Magnetic force and drag force
   • D) Electrostatic force and normal force
6. 6.

   Which of the following interactions occurs entirely through a field force without requiring any contact force?

   • A) A book resting securely on a flat desk
   • B) A sled sliding across snow and coming to a stop
   • C) A hanging lamp suspended from a ceiling by a cable
   • D) The Moon orbiting Earth due to gravitational attraction
7. 7.

   A wooden block is lifted upward off a table so that it is no longer touching the surface. How do the normal force from the table and the gravitational force from Earth acting on the block respond to this separation?

   • A) Both the normal force and the gravitational force immediately drop to zero.
   • B) The normal force continues to act unchanged, while the gravitational force immediately drops to zero.
   • C) Neither force changes because both contact and field forces operate independently of physical touch.
   • D) The normal force immediately drops to zero, while the gravitational force continues to act across the separation distance.
8. 8.

   Which of the following forces is classified as a field force because it can act over a distance without physical contact between objects?

   • A) Normal force
   • B) Tension force
   • C) Frictional force
   • D) Gravitational force