Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What piece of equipment is used to measure weight?
   • Weight is measured using a calibrated spring-balance (a newtonmeter).
2. What is the relationship between the weight of an object and the mass of an object?
   • The weight of an object and the mass of an object are directly proportional.
3. What does gravitational field strength depend on?
   • The weight of an object depends on the gravitational field strength at the point where the object is.
4. What is weight and what causes the force of gravity close to the Earth?
   • Weight is the Force acting on an object due to gravity. The Force of gravity close to the Earth is due to the gravitational field around the Earth.
5. What is the name of the single point of an object where the weight is considered to act?
   • The weight of an object may be considered to act at a single point referred to as the object's centre of mass.
6. What equation is used to calculate weight? Include the SI units.
   • The weight of an object can be calculated using the equation: weight = mass x gravitational field strength W = m g weight, W, in newtons, N mass, m, in kilograms, kg gravitational field strength, g, in newtons per kilogram, N/kg (In any calculation the value of the gravitational field strength (g) will be given.)