Topic 4: Further Motion Concepts Flashcards
What is momentum?
The tendency of the object to keep moving in the same direction.
Is momentum a scalar or vector quantity?
Vector.
due to it having direction
How do you calculate momentum?
momentum = mass x velocity
p=mv
What is the conservation of momentum?
The momentum before (an interaction) = momentum after, providing no external forces act.
What is momentum measured in?
Kgm/s
How do calculate a change in momentum?
Final momentum - initial momentum = change in momentum
What is a mathematical way of writing Newton’s second law?
Force = Change in momentum / time for change
What type of collision is kinetic energy completely conserved in?
Elastic collisions.
What does x stand for?
distance travelled.
What does u stand for?
initial velocity of object.
What does v stand for?
final velocity of object.
What does a stand for?
acceleration of object.
What does t stand for?
time of the motion.
When the equations of motion are being used, what has to be constant?
Acceleration.
If momentum has direction, what happens to the forces in a collision?
There is one direction, so one object will have a negative momentum.
What is a moment?
The turning force that acts on the pivot.
How do you calculate a moment?
Moment = force x distance to the pivot
M=fd
What are the units for a moment?
Nm
What is the principle of moments?
sum of clockwise moments = sum of anticlockwise moments.
What does it mean if both sides are balanced?
That the system is balanced, at equilibrium.
What is the equation for kinetic energy?
KE = mv² / 2
This is used to calculate the KE before and after an interaction.
