Yr 9 Physics-Forces Flashcards
Revise forces topic
What is it called when the resultant force in 0?
Equilibrium
What is gravity?
The attraction of masses
If mass doubles what happens to the weight?
It doubles
What could happen to a spring with force?
Stretch
Compress
Bend
What are the three rules for bearings
Three digits
Measure clockwise
Measure from North
What is directly proportional to extension?
Force
How many digits are in a bearing?
Three
How do you measure weight?
With a Newtonmeter
Where does weight act from?
Centre of gravity
Where is gravity the strongest?
Centre of the object
Name three contact forces
Friction
Air Resistance
Upthrust
Lift
Name three non-contact forces
Gravity
Magnetic force
Electrostatic force
What is the difference between a vector and a scalar?
A scalar has no direction
How many forces must there be acting on an object?
Two
How do you work out the resultant force?
Add the parallel forces and subtract the opposite ones
