Advanced forces

• What are contact forces?

  Forces that only act when two things are touching.
• What are non-contact forces?

  Forces that can act when things are not touching.
• What are the units for measuring forces?

  Newtons.
• What is drag force?

  It is the force acting on an object moving through air or water that causes it to slow down.
• How does friction affect motion?

  Friction slows things down when they move on a surface.
• What does it mean for an object to be streamlined?

  It means the object is shaped to reduce friction or air resistance.
• What is the law of moments?

  An object is in equilibrium if the clockwise moments equal the anticlockwise moments.
• What is upthrust?

  The force on an object in liquid or gas that pushes it up.
• What is a moment in physics?

  A measure of the ability of a force to rotate an object around a pivot.
• What does elastic mean in terms of materials?

  Something that stretches and springs back to its normal shape.
• What does it mean to deform an object?

  It means to change its shape.
• What does it mean to compress an object?

  It means to squash the object.
• What is extension in terms of forces?

  The difference between the original length of an object and the length when a force is applied.
• What is pressure in physics?

  The ratio of force to surface area, measured in N/m², and how it causes stresses in solids.

  
• What is liquid pressure?

  The pressure produced by collisions of particles in a liquid.
• What does equilibrium mean in physics?

  When all of the forces on something are balanced and cancel out.
• What are contact forces?

  Forces that only act when two things are touching
• What are non-contact forces?

  Forces that can act when things are not touching
• What are the units for measuring forces?

  Newtons
• What is drag force?

  It is the force acting on an object moving through air or water that causes it to slow down

  
• How does friction affect motion?

  Friction slows things down when they move on a surface
• What does it mean for an object to be streamlined?

  It means the object is shaped to reduce friction or air resistance
• What is the law of moments?

  An object is in equilibrium if the clockwise moments equal the anticlockwise moments
• What is upthrust?

  The force on an object in liquid or gas that pushes it up
• What is a moment in physics?

  A measure of the ability of a force to rotate an object around a pivot
• What does it mean for something to be elastic?

  It stretches and springs back to its normal shape
• What does it mean to deform an object?

  It means to change its shape
• What does it mean to compress an object?

  It means to squash the object
• What is extension in terms of forces?

  The difference between the original length of an object and the length when a force is applied
• How is pressure defined in physics?

  It is the ratio of force to surface area, measured in N/m²

  
• What is liquid pressure?

  The pressure produced by collisions of particles in a liquid
• What does equilibrium mean in physics?

  It means all of the forces on something are balanced and cancel out
• What is the unit of measurement for moments?

  Newton meters (Nm)
• How is a moment calculated?


  Moment is calculated using the equation: $\text{moment (Nm)} =$$\text{force (N)} \times \text{distance from pivot (m)}$
• What happens to the moment when the distance from the pivot increases?


  The moment increases with distance from the pivot.
• What is a resultant force?


  The resultant force is the overall force acting on an object when all forces are combined.
• What are the key types of forces?

  • **Contact force**: Acts when objects are touching.
  • **Non-contact force**: Acts at a distance (e.g., gravity).
  • **Resultant force**: Overall force from combined forces.
  • **Friction**: Slows down movement on surfaces.
  • **Air resistance**: Friction acting on objects moving through air.
• What is Hooke's Law?


  Hooke's Law states that the force needed to extend or compress a spring is proportional to the distance it is stretched or compressed.
• What are the properties of pressure in liquids?


  • **Incompressible**: Liquids cannot be easily compressed.
  • **Pressure increases with depth**: More depth means more pressure.
  • Pressure spreads out: Pressure is transmitted equally in all directions.
• How does pressure change with depth in a liquid?


  Pressure increases linearly with depth in a liquid.