machines and pressure

• Drag can be reduced by streamlining, which makes objects more aerodynamic.
• fluid friction is the friction between two liquids or two fluids and a solid
• viscous forces act on all moving parts of a machine that come into contact with a liquid
• stopping distance= thinking distance+ braking distance
• forces and rotation- forces can have a turning effect on an object
• a lever is a rigid body that is able to turn arond a pivot
• the unit for moments is Nm (newton-meters)
• moment= effort (force) x distance to pivot
• pressure (N/m2)= force(N)/ area(m2)
• pressure increases as the depth of water increases
• pressure increases when the fluid is compressed
• pressure decreases with increasing radius