Topic: Gravity

Part 1 - Keywords:

1. Gravity

2. Weight

3. Gravitational field

4. Gravitational field strength

5. Centre of mass

Part 2 - Key Facts:

• Weight is the force exerted on an object due to gravity.

• The force of gravity near the Earth is due to the gravitational field surrounding it.

• The weight of an object depends on the gravitational field strength at its location.

• Weight (W) can be calculated using the equation: W = m × g.

• In the equation, W represents weight in newtons (N), m represents mass in kilograms (kg), and g represents gravitational field strength in newtons per kilogram (N/kg).

Part 3 - Quick Quiz:

1. What is weight?

   a) The mass of an object

   b) The force acting on an object due to gravity

   c) The volume of an object

   Answer: b) The force acting on an object due to gravity

2. How is weight calculated?

   a) Weight = Mass × Volume

   b) Weight = Mass × Gravitational field strength

   c) Weight = Mass ÷ Gravitational field strength

   Answer: b) Weight = Mass × Gravitational field strength

3. What is the unit of gravitational field strength?

   a) Newtons per cubic meter (N/m³ )

   b) Newtons per kilogram (N/kg)

   c) Newtons per meter (N/m)

   Answer: b) Newtons per kilogram (N/kg)

Part 4 - Going Further: Explain how the gravitational field strength affects the weight of an object. Provide examples of how changes in gravitational field strength can impact weight.

Part 5 - Revision Tips: Practice using the weight calculation formula W = m × g with different values of mass and gravitational field strength to reinforce your understanding.

Part 6 - More Help: