When to use "nor"

English tip: When to use "nor"? NOTE: It literally means "and not." It expresses a negative condition and you are obligated to use "nor" if your sentence expresses a negative and follows it with another negative condition. 1. Let’s start with an easy one. When you use "neither" in a sentence, you use "nor" to[…]

Gravity is proportional to mass

Science tip: All objects at the same place experience a gravitational FORCE (or pull) that is proportional to its mass. So the larger the mass, the larger the gravitational force. This force is there regardless of the speed or orientation of the object. It is there whether the object is flying or falling, whether it’s[…]


Fewer or Less

English tip: This is a common sign we see at supermarkets. "10 items or less"— this is WRONG. Remember: -You use "less" when you are referring to things you are unable to count. -You use "fewer" when you can count the items individually. Examples: I want a cup of coffee with less sugar in it.[…]

Friction is independent of surface area

Science tip: Friction is independent of the surface area! It may sound counter-intuitive, since increasing the contact area would create a larger source of frictional forces. However, it also reduces the pressure between the two surfaces for a given force holding them together. Since pressure equals force divided by the area of contact, it works[…]