physics forces

• How can we describe a force?


  A force is a push or pull that acts on an object due to its interaction with another object
• In what unit do we measure force?

  Newtons
• What does it mean when we say forces have direction?


  It means that forces act in a specific direction, such as to the right
• Why are forces classified as vector quantities?


  Because they have both magnitude and direction
• What is the key difference between contact forces and non-contact forces?


  Contact forces require physical touching, while non-contact forces do not
• What is an example of a contact force?


  The friction between a board and sand
• Why is air resistance considered a contact force?


  Because the object must come into contact with air particles to feel the resistance
• What is tension in the context of contact forces?


  Tension is the pulling force exerted through a rope
• What is the normal contact force also known as?


  The reaction force
• How does the normal contact force work with a rock on a table?


  The table exerts an equal and opposite force upwards to support the rock's weight
• What are the three types of non-contact forces mentioned?

  Gravitational force, magnetic force, and electrostatic force
• What is gravitational force?


  It is a force of attraction between any two objects that have mass
• How do magnetic forces behave?


  They can be attractive or repulsive depending on the poles of the magnets
• What are electrostatic forces?


  Forces between charged objects that can be attractive or repulsive
• How does the strength of non-contact forces change with distance?


  The strength of the force decreases as the objects get further apart
• What is a scalar quantity?

  A quantity with just a number
• What is a vector quantity?

  A quantity with a number and direction
• Give an example of a scalar quantity.

  Distance
• Give an example of a vector quantity.

  Displacement
• What is the difference between mass and weight?

  Weight is mass times gravity
• How is weight measured?

  In Newtons
• How is mass measured?

  In kilograms
• What is the formula for work?

  Work = Force × Distance
• What is the unit of work?

  Joules
• What does Hooke's law describe?

  The relationship between force and extension
• What happens to a spring when weights are added?

  It stretches longer
• What is the limit of proportionality in Hooke's law?

  The point where extension stops increasing
• What is the formula for force in relation to a spring?

  Force = Spring constant × Extension
• What is the formula for kinetic energy?

  Kinetic energy = ½ × Mass × Velocity²
• What is the unit of kinetic energy?

  Joules
• What is the formula for moment?

  Moment = Force × Distance
• What is the unit of moment?

  Newton meters
• What happens when forces are unbalanced?

  They create a turning effect
• What is pressure defined as?

  Pressure = Force / Area
• What are the units of pressure?

  Pascal
• What is the formula for pressure involving height?

  Pressure = Height × Density × Gravitational field strength
• What is the value of gravitational field strength?

  9.8 Newtons per kilogram
• What does a distance-time graph show?

  Distance versus time relationship
• What does a flat line on a distance-time graph indicate?

  No movement
• How do you calculate speed from a distance-time graph?

  Gradient = Distance / Time