Problem: Part A. Identify the types of forces acting on an oil droplet while the voltage is turned on and the droplet is either falling or rising.Buoyant ForceElectric ForceSpring ForceGravitational ForceNormal ForceAir Resistive ForceCheck all that apply.The Millikan oil drop experiment was a direct and convincing experiment for the measurement of the charge on a single electron. Millikan performed an experiment on a charged oil droplet. By balancing the forces acting on the oil droplet, the charge on a single electron can be calculated. Millikan found that the charge of an oil droplet is always a whole-number multiple of−1.60 × 10−19 C. Thus, the charge on a single electron is −1.60 × 10−19 C.Various types of forces that are observed in natureYou can observe the following types of forces in nature:1. The attraction or repulsion between objects or particles that have electrical charge is known as the electric force.2. The force with which the Earth, the Moon, or any other massively large object attracts another object toward itself is known as the gravitational force. 3. The force exerted upon an object that is in contact with another stationary object is known as a normal force.4. The special type of frictional force that acts upon objects as they travel through the air is known as an air resistive force.5. The force exerted by a compressed or stretched spring upon any object that is attached to it is known as a spring force.6. The upward force caused by the air pressure that keeps things afloat is known as a buoyant force.

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Problem Details

Part A. Identify the types of forces acting on an oil droplet while the voltage is turned on and the droplet is either falling or rising.

  • Buoyant Force
  • Electric Force
  • Spring Force
  • Gravitational Force
  • Normal Force
  • Air Resistive Force

Check all that apply.


The Millikan oil drop experiment was a direct and convincing experiment for the measurement of the charge on a single electron. Millikan performed an experiment on a charged oil droplet. By balancing the forces acting on the oil droplet, the charge on a single electron can be calculated. Millikan found that the charge of an oil droplet is always a whole-number multiple of
−1.60 × 10−19 C. Thus, the charge on a single electron is −1.60 × 10−19 C.

Various types of forces that are observed in nature

You can observe the following types of forces in nature:

1. The attraction or repulsion between objects or particles that have electrical charge is known as the electric force.
2. The force with which the Earth, the Moon, or any other massively large object attracts another object toward itself is known as the gravitational force. 3. The force exerted upon an object that is in contact with another stationary object is known as a normal force.
4. The special type of frictional force that acts upon objects as they travel through the air is known as an air resistive force.
5. The force exerted by a compressed or stretched spring upon any object that is attached to it is known as a spring force.
6. The upward force caused by the air pressure that keeps things afloat is known as a buoyant force.

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