Topic 2.2: Forces I Flashcards
What can a force change?
A force can casue a change in velocity (acceleration), shape (deformation) (hooke’s law) and direction (moments)
What is Newton’s 1st law?
Every body remains at rest or at constant speed in a straight line (constant velocity), unless a resultant force acts on it
What is inertia?
Inertia is a property of mass (ie large mass => large inertia)
Inertia is the reluctance of a stationary body to move, or the reluctance of a moving body to stop
What is equilibrium?
Transitional equilibrium is when the resultant force in any direction is zero. Meaning the object is stationary or moving ain a straight line
What does transitional equilibrium refer to?
Straight line motion
Are masses moving in a circle in equilibrium? Why?
No. There is a resultant centripetal force
What is Newton’s 2nd law?
The Resultant Force acting on a body is proportional to the rate of change of momentum
What is Newton’s 3rd law?
To every action there is an equal but opposite reaction
If body A exerts a force on body B, body B exerts an equal but opposite force on body A
What is a free body diagram?
All the forces acting on one object
What is the contact force?
The force exerted on an object when interacting with another object
When dealling with a rope, are the values for tension different on each end?
No, tension has the same value at each end of the rope
What is Hooke’s law?
As long as its proportional limit is not exceeded the extension of a metal wire (or spring) is proportional to the force (load) applied
What is Hooke’s law?
As long as its proportional limit is not exceeded the extension of a metal wire (or spring) is proportional to the force (load) applied
What is Hooke’s law?
As long as its proportional limit is not exceeded the extension of a metal wire (or spring) is proportional to the force (load) applied
What is Hooke’s law?
As long as its proportional limit is not exceeded the extension of a metal wire (or spring) is proportional to the force (load) applied
