Module 3 - Forces and motion (Dynamics) Flashcards
(12 cards)
What is one newton equal to
The force required to accelerate a mass of 1kg by 1ms-2, in the direction of the force
What is weight
The gravitational force acting on an object through its centre of mass
What is friction
The force that opposes the motion of an object when 2 objects rub together
What is drag
The resitive force on an object travelling through a fluid
What is tension
The pulling force caused by two or more forces acting on an object in opposite directions which stretch the object
What is upthrust
The upward buoyancy force acting on an object in a fluid
What is the normal contact force
A force arising when an object is in contact with another, acting normally to the plane of contact
What is lift
The upwards force on an wing caused by presssure differences
What is Newton’s 2nd Law assuming constant mass
The resultant force on an object is directly proportional to the acceleration of the object.
What equation links to Newton’s 2nd Law assuming constant mass
Resultant Force (F) = Mass (m) x Acceleration (a)
Describe the motion of an object under a constant force
If an object experiences a constant force, there must be a resultant acceleration, using F = ma
Why can’t you use F = ma when calculating the acceleration of a space shuttle
The space shuttle removes parts through the journey and so loses mass
