Springs & Hooke’s Law
Spring length includes the initial length of the spring
A lever consists of a beam, a fulcrum and which two other components?
effort and a load
What is another word for the buoyant force?
upthrust
An object is more stable if its centre of mass is ______.
low
What do all chemical changes have in common?
They produce new substances
State Hooke's law as an equation.
F = kx
What class of lever is a see-saw?
class one
According to Archimedes’ principle, the buoyant force equals the ______.
Weight of fluid displaced
When suspended, an object rotates so that its centre of mass must lie ______ the suspension point.
below
A solid that forms when two solutions react is called a ______.
precipitate
If a 10 N force stretches a spring by 5 cm, what is the spring constant?
2 N/cm
In a Class 3 lever, which lever component is in the middle?
the effort
An object floats when its ______ equals the buoyant force.
Weight
Which of the following real objects can have its centre of mass found without suspending it, simply by using symmetry?
A) A ruler
B) A potato
C) A shoe
A ruler
In a chemical equation which substances appear on the left hand side?
reactants
Which property of a spring determines how much it stretches under a given force? ie a high k means more of this property.
stiffness
A 2 N effort balances a 20 N load positioned 0.5 m from the fulcrum. How far from the fulcrum is the effort applied?
5 metres
A body weighs 8 N in air and 6 N in water. What is the buoyant force?
2 N
What term describes the situation when an object’s centre of mass moves beyond its base of support?
toppling
In the chemical formula 2H₂O, what is the name of the large number 2, and what does it mean?
Coefficient
It means there are two molecules of water taking part in the reaction.
A spring with an initial length of 10 cm has a stiffness of 5 N/cm. If a weight of 10 N is hung from the spring, what will its new length be?
12 cm
What is another word for moment? Spell it!
Torque
Actual weight - buoyant force = ???
apparent weight
Where is the centre of mass of a uniform donut (torus) located?
in the hole!!!!
A peanut transfers heat to 100 g of water raising its temperature from 20°C to 30°C. How much energy was transferred?