1.3 Dynamics
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1
What does newtons 3rd law state?
If body A exerts a force on body B, then body B will exert an equal and opposite force on body A
2
What does the principle of conservation of momentum state?
momenta of the bodies is constant provided there is no resultant external force
3
What is an isolated/closed system?
A system where no external forces act and no particles enter or leave
4
What is the momentum triangle?
p
m | v
m | v
5
What is mass a measure of?
a scalar quantity that measures the bodys inertia
6
What type of quantity is momentum?
Vector quantity
7
What is the unit of momentum?
kg m s -1
8
What is it called when colliding objects stick together?
Inelastic collisions
9
What is it called when colliding objects bounce apart?
Elastic collision
10
What do inelastic collisions result in a loss of?
Kinetic energy
11
What is maintained in elastic collisions?
Kinetic energy
12
What is a force?
a push or a pull which causes the motion of a body
13
What is newtons third law used to explain?
Rocket propulsion
14
What diagram links to newtons 2nd law?
Free body diagram
15
Whats the equation for newtons second law?
sigma F=ma
16
What is the resultant force on a body in a direction equal to?
The mass of the body x acceleration of body in that direction
17
What is force the rate of change of?
momentum
18
What is the normal contact force?
When a object is resting on a surface, the surface exerts a force on the object
19
Why does the normal contact force happen?
Molecules in the two bodies are in close contact, the outer electrons are repelling eachother
20
What is the equation triangle for linear momentum?
p
m | v
m | v
21
What is the unit for linear momentum?
kgms^-1
22
In which direction is momentum?
The direction of the velocity
23
How do you know if a particle is going the opposite way after a collison?
If one the speeds is negative
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