CH 3: Dynamics I - Mass and Weight

• Mass is a measure of the amount of substance or matter of an object, with the SI unit being kilogram (kg).
• The initial of an object is dependent on its mass, with a larger mass leading to a larger initial.
• Gravitational force is the force that exists between two measures, pulling the two masses together.
• Gravitational field strength is the gravitational force acting per unit mass, equal to gravitational force over mass (g = F/m).
• Gravitational field strength is a vector quantity, with its direction at any point being the same as the direction of the gravitational force acting on a unit mass located at that point.
• The formula for average density equals total mass over total volume.
• An object with density less than the density of water will float on the surface of the water and an object with density more than the density of water will sink to the bottom of the water.
• The mass of an object is the same regardless of its location, therefore the mass for the spaceship is still 5000 kilograms.
• Mass is a scalar quantity and weight is a vector quantity.
• Mass is measured using a beam balance and weight is measured using a spring balance.
• The weight of the spaceship on planet alpha is 200,000 newtons because the gravitational field strength g on planet alpha is 4 times the value of g on earth.
• A shape which is made from metals can float on water because its average density is less than the density of water.
• The mass of a spaceship is 5000 kilograms on the surface of the earth and the gravitational field strength g is measured to be 10 newtons per kilogram.
• The volume of an irregular shape object can be found by measuring the volume of water displaced when the object is fully submerged in water.
• The symbol for density is kg meters to the power of negative 3.
• The density of an object is the amount of mass per unit volume, represented by the formula rho equals m over v.