Forces Flashcards
How do you work out the force of something?
Mass x acceleration
What are vectors?
Physical quantities that have direction.
What are scalars?
Physical quantities that have size, but no specific direction.
What is magnitude?
The size of quantity
What is displacement?
Distance without change of direction.
Name ten forces?
- Push
- Pull
- Thrust
- Friction
- Upthrust
- Weight
- Air resistance
- Drag (water resistance)
- Lift
- Tension
What is the equation to work out the moment?
Force X perpendicular distance from the line of action of the force to the pivot.
How do you find the centre of mass for an object that is flat and symmetrical?
It’s centre of mass is along the axis of symmetry.
What does it mean if an object is in equilibrium?
The object is at rest.
What is the meaning of a non-renewable energy resource?
Non-renewable energy resources take millions of years to form and will eventually run out as there is a finite supply on earth.
What is the meaning of a renewable energy resource?
Renewable energy resources will not run out and will be around for millions of years.
What is a fuel?
A fuel is something that releases energy when burned/ via combustion / via nuclear fission.
What are 3 examples of fossil fuels?
Coal, oil and natural gas.
What are 3 examples of biofuels?
Wood, ethanol and methane.
What are nuclear fuels?
They are heavier elements that can only be formed due to the enormous energy from supernova explosions when massive stars turn to neutron stars or black holes.
