Physics Example Problems

Momentum Example Problem 1 — Momentum is a measurement of inertia in motion. When a mass has velocity, it has momentum. Momentum is calculated by the equation momentum = mass x velocitymomentum = mv This conservation of momentum example problem illustrates the principle of conservation of momentum after a collision between two objects. Problem: Consider […]

Conservation of Momentum Example Problem

This entry was posted on June 17, 2015 by Todd Helmenstine (updated on September 14, 2024)

Equilibrium Cat 1 — Consider a string with a weight tied to the end. Gravity pulls the string down while the string pulls the weight. These two forces are equal and opposite to each other. Together, they cancel each other out. The weight is “at rest” with no net forces acting on it. This state […]

Equilibrium Example Problem – Balance

This entry was posted on June 6, 2015 by Todd Helmenstine (updated on July 8, 2019)

Coulomb Force Example Problem

This entry was posted on October 23, 2014 by Todd Helmenstine (updated on March 21, 2026)

Coulomb Example math step 5 — Coulomb’s Law is a force law between charged bodies. It relates the force to the magnitude and charges on the two bodies and the distance between them by the relationship: where q1 and q2 is the amount of charge in Coulombsr is the distance in meters between the chargesk is […]

Coulomb’s Law Example Problem

This entry was posted on October 23, 2014 by Todd Helmenstine (updated on March 21, 2026)

Pressure is a measurement of force per unit area. Atmospheres (atm) is a common unit when working with gasses and the pascal is the SI unit of pressure equal to one newton per square meter (N/m2). Pascal represents a very small pressure so the larger kilopascal (kPa) is used more […]

Pressure Conversion – Atm to kPa

This entry was posted on September 15, 2014 by Todd Helmenstine (updated on January 20, 2022)

atm to PSI conversion math step 1 — Pressure is a measurement of force per unit area. Atmospheres (atm) and pounds (force) per square inch (PSI) appear on many pressure gauges on scientific instruments. This example problem shows how to convert atm to PSI units. Example Problem:The pressure at sea level is generally considered to be 1 atm. Pressure […]

Pressure Conversions – Atm to PSI

This entry was posted on September 15, 2014 by Todd Helmenstine (updated on January 20, 2022)

Pressure is a measurement of force per unit area. There are many different units associated with pressure. The SI unit for pressure is the pascal (Pa). One pascal is equal to one newton per square meter (N/m2). One pascal is a very small amount of pressure, so the kilopascal (kPa) is […]

Pressure Conversions – Atm to kPa

This entry was posted on September 12, 2014 by Todd Helmenstine (updated on January 20, 2022)

Old-barometers — Pressure is a measurement of force per unit area. Unfortunately, there are many different units associated with pressure. The SI unit for pressure is the pascal (Pa). One pascal is equal to one newton per square meter (N/m2). One pascal is a very small amount of pressure, so the kilopascal (kPa) […]

Pressure Conversions – mmHg to kPa Tutorial

This entry was posted on September 11, 2014 by Todd Helmenstine (updated on January 20, 2022)

Density is the measurement of the amount of mass per unit volume. Density calculations are done using the formula: whereρ = densitym = massV = volume Example Problems:1. Calculate the density in g/mL of 30 mL of solution that weighs 120 grams.2. Calculate the density in g/mL of 0.4 L of solution […]

Density Calculations – Worked Example Problem

This entry was posted on September 10, 2014 by Todd Helmenstine (updated on May 2, 2021)