Short description Students are in role of a new employee at SETI, the organisation leading the search for extraterrestrial intelligence. They perform a series of practical tasks to help them plan a mission to the Moon. Learning objectives Identify forces and represent their size and direction with arrows. Combine forces to decide if the result is a balanced or unbalanced force. Blueprint curriculum link Unit: Contact forces Concept: Balanced & unbalanced: When the net force on an object is zero, it is in equilibrium and its motion is constant Learning stage: Acquire Activity contents Teachers guide Powerpoint presentation The activity is delivered as a zip file. After you checkout, you will be sent an email with the link to download it.