forces

Flussdiagrammknoten

• forces

• gravitational force

• gravity is the force that pulls objects down 

• 9.8m/s2

• gravity depends on mass

• more mass => greater gravity

• mass => how much matter an object contains (kg)

• weight => the force with which gravity pulls an object down (N)

• weight = mass × acceleration due to gravity

• Friction

• friction is the force that stops or slows movement down

• Normal Force

• force that prevents an object moving through a solid surface

• - opposes gravity - always at a right angle to surface

• Friction with solid surfaces

• Things that increase friction

• - rough surfaces   - greater force more force  

• things that decrease friction

• - smooth surfaces - lubricants - less contact

• Drag

• Friction between a surface and the liquid or gas its moving through

• Air resistance

• Drag due to air - streamlining helps minimise drag