chapter 3 force and pressure

• Pressure can be calculated using the formula P = F/A, where P is pressure, F is force, and A is area.
• The SI unit of pressure is the pascal (Pa).
• contact forces are forces that act between two objects that are in contact with each other such as friction, air resistance, tension and normal force.
• non-contact forces are forces that do not involve the direct contact of two objects such as gravitational force, magnetic force, and electrostatic force.
• mass is not dependent on location as it is the amount of matter in a body. the SI unit for mass is kg.
• weight is the measure of how strongly an object is pulled towards Earth by gravity. The weight of an object depends on its mass and the strength of gravity at its location. The SI unit for weight is N.
• the formula to calculate density is density = mass/volume