P8 - Forces in Balance Flashcards
1
Q
Contact Forces
A
- Objects have to physically touch
- Friction, trying to stop a moving object
- Air Resistance, effect of air
- Up thrust, liquid pushing a object to the surface
- Tension, squeezing/stretching
2
Q
Force
A
Push or Pull due when interacting with an object, measured in Newtons
3
Q
Non-Contact Force
A
- Force without touching
- Gravity
- Electrostatic, attract/repel between charged objects
- Magnetism, attract/repel in a magnetic field
4
Q
Newton’s Law
A
- When objects collide, they exert equal force on each other
5
Q
Action Force
A
Force you exert
6
Q
Reaction Force
A
Force going against you
7
Q
Presentation of Force
A
Longer/Bigger arrows represent difference of forces
8
Q
Resultant Force
A
Difference of 2 forces
9
Q
Equilibrium
A
If 2 equal forces move in opposite direction, it creates an equilibrium
10
Q
Vector
A
Object presented by magnitude and direction, using an arrow (size presents magnitude, end represent direction)
11
Q
Scalars
A
Objects presented by magnitude only
12
Q
Centre of Mass in Regular Object
A
Where all lines of symmetry intersect
13
Q
Centre of Mass in Irregular Object
A
- Tie object to a string and place a Plumbline near it which shows the centre of mass
- Draw a straight line though the Plumbline and Shape to find the centre of mass
14
Q
Scalar Quantities
A
- Distance, doesn’t give direction
15
Q
Vector Quantity
A
- Displacement, change from original position
- Velocity, rate of object changing its’ position
- Acceleration, change of velocity overtime
