P8 Flashcards
WHAT IS DISPLACMENT ?
displacement is distance with no change in direction
WHAT IS A VECTOR QUANTITY?
has both direction and magnitude
(5km north east)
WHAT IS A SCALAR QUANTITY?
scalar quantity only has magnitude
(5km)
WHAT ARE VECTOR QUANTITIES REPRESNTED BY?
scale diagrams direction of arrow = direction size of arrow= magnitude
WHAT IS A FORCE?
A push or pull tjay acts on an object due to its interaction with another object
WHAT IS A CONTACT FORCE AN A EXAMPLE?
Contact occurs when an interaction with another object happens
-friction
-tension
-air resistance
WHAT IS A NON CONTACT FORCE AND AN EXAMPLE?
doesn’t require objects to touch
-magnetic
-electrostatic
-gravitational
WHAT DOES NEWTONS THIRD LAW OF MOTION SAY?
When two objects interact they exert equal and opposite force
WHAT DOES NEWTONS FIRST LAW OF MOTION STATE?
If forces acting on object are equal the resultant force =0
WHAT HAPPENS WHEN NON CONTACT FORCE GETS FURTHER APART?
Force decreases as object gets further apart
WHAT IS A RESULTANT FORCE?
summary of all forged acting on an object,some forces cancel out as they are acting in opposite directions
IF THERES A FORCE OF 30N AND A FORCE OF 10N BOTH ACTING TO THE LEFT WHATS THE RF?
40N
———> —->
IF THERES A FORCE OF 20N ACTING RIGHT AND A FORCE OF 60N ACTING LEFT WHAT IS THE RF?
40N
<—— ———————->
WHAT DOES NEWTONS SECOND LAW OF MOTIONS STATE?
If non zero RF acts on object it will accelerate acceleration is defined as change in velocity over time and velocity is a vector quantity meaning acceleration may be deemed as both a change in speed or direction
WHAT IS INERTIA?
Objects tendency to stay at rest of tendency of objects motion to remain unchanged
WHAT IS A MOMENT?
A turning effect of a force
WHAT IS THE EQUATION RELATED TO MOMENTS?
moment (N/m) = Force (N) x Perpendicular distance (m)
WHERE IS THE PERPENDICULAR DISTANCE MEASURED FROM?
From point force is applied to the central piviot
WHAT IS THE PRINCIPLE OF MOMENTS?
Total anticlockwise moment = Total clockwise moment
WHAT DO LEVERS DO?
Transmit turning effect of force
WHAT ARE SOME EXAMPLES OF LEVERS?
scissors, wheelbarrow and hammer
WHAT DO GEARS DO?
Transmit turning effects
WHAT DO GEARS DO?
Transmit turning effects
IF RADIUS OF GEAR B IS TWO TIMES BIGGER THEN A WHAT DOES THAT MEAN?
TURNINF EFFECT OF BE IS ALSO TWO TIMES OF A
WHAT IS CENTRE OF MASS?
a single point on an object where all its mass may be considered as concerntrated
ANY OBJECT THAT IS FREELY SUSPENDED…
Will come to rest with its centre of mass directly above the point of suspension
WHEN A FLAT OBJECT IS SYMMETRICAL WHERE DOES ITS CENTRE OF MASS LIE?
along the axis of symmetry
WHEN AN OBJECT IS WIDER ITS CENTRE OF MASS IS….
centre of mass is lower meaning object is more stable
