changing speed Flashcards
1
Q
what is the equation for acceleration?
A
change in speed divided by time taken
2
Q
what is velocity?
A
the speed of a moving object in a known direction
3
Q
if two trains are moving at the same speed in opposite direction on parallel tracks what will the velocities have in common?
A
the same magnitude (size) opposite signs (positive and negative)
4
Q
what would happen if the trains were travelling in the same direction?
A
their relative velocity is equal
5
Q
what is the equation for change in velocity?
A
acceleration x time taken
6
Q
what is the equation for strictly acceleration?
A
changes in velocity divided by time taken
7
Q
what is the unit of force?
A
newton
8
Q
what is it called if the forces acting on an object are balanced?
A
it is at rest or at a constant speed
9
Q
what is the unbalanced force equal to?
A
the forward force - the backward force
