Dynamics Flashcards
1
Q
Newtons 1st law of motion
A
Body stays at rest or continues to move with uniform velocity unless a resultant force acts on it
2
Q
Law of inertia
A
Property of a body to resist change in motion
mass of body is the measure of the inertia
3
Q
Newtons 2nd law of motion
A
Rate of change of momentum of a body is directly proportional to the resultant force acting on the body and takes place in the direction of the resultant force
4
Q
What is linear momentum
A
- product of its mass and velocity
- p = mv
- direction of linear momentum is in the direction of the velocity
5
Q
What is Impulse
A
- product of the average force acting on the body and the time the average force is acting on it
- equal to the change in momentum of the body as a result of the application of the force
6
Q
Area under F/t graph
A
- measure of impulse
- change in momentum
7
Q
Gradient of momentum/time graph
A
Resultant force
8
Q
Newtons 3rd law
A
- if body A exerts a force on body B, then body B will exert a force of the same type that is equal in magnitude and opposite in direction on body A
9
Q
Conditions for Action-Reaction pair
A
- same type of force
- act on two different bodies
- equal in magnitude but opposite in direction to each other
10
Q
Principle of conservation of linear momentum
A
Net momentum of a system remains constant provided no external resultant force acts on the system
11
Q
Elastic collisions
A
- total linear momentum and kinetic energy of system is conserved
- u1 + v1 = v2 + u2
relative speed of approach of bodies is equal to relative speed of separation
12
Q
Inelastic collisions
A
- total linear momentum of colliding objects is conserved
- kinetic energy is not conserved
- perfectly inelastic equations, the two bodies will stick together as one single body after collision and move off together with common velocity
