chap 8 & 9 Flashcards
(24 cards)
just like force how can you work out Magnitude of resultant velocity
(V1 + V2)^1/2
how can you work out initial direction
By looking at what the first force acting on the object is
what is the (motive force + resistive force) =
resultant force (the force of the thruster’s during acceleration)
sketch acceleration on a distance time graph
parabolic curve
when sketching force diagrams what should you remember
.friction
.weight
.tension
constant velocity
work done on a slope
Work=(mg⋅sin(θ))×d
weight on inclined plane
vertical
Newtons first law
A body will remain at rest or move with constant velocity unless acted on by a resultant force
If object is moving at constant speed then how do the forces acting on echother compare
they are equal to eachother e.g The forces to the left = the forces to the right
Newtons second law
The resultant force on an object is equal to its rate of change in momentum. or in other words The resultant force on an object with constant mass is directly proportional to its acceleration.
Newtons third law
If body A exerts a force on body B, then body B will exert a force on body A of equal magnitude but in the opposite direction
in other words (For every action is an equal and opposite reaction) don’t say the one in brackets though
Is this Newtons 3rd law and why
Is this Newtons 3rd law and why
Is momentum a vector or scalar
vector
what is the relationship between force and momentum
- final p - before p
to calculate Newtons, hat mass do you need
kg
what is impulse equal to
change in momentum
on a force time graph what does the area give you
impulse
sometimes areas don’t look the same but they are, they might try this Q
