Physics

• What is the most dangerous radiation at a distance

  Gamma
• The intermolecular forces of attraction in a substance with a higher melting point are stronger than intermolecular forces of attraction in a substance with a lower melting point
• The type of nuclear radiation used in smoke alarms is alpha radiation
• Alpha radiation is commonly used in smoke alarms due to its ionizing properties that make it effective in detecting smoke particles
• What is the name given to the change in state from liquid to solid

  Freezing
• What happens to the density of a gas as it is heated as if it is NOT kept in A closed container

  decreases
• What happens to the volume of gas as it is heated

  Increase
• What is the difference between a scalar and a vector quantity?

  A scalar has no direction and only a magnitude whereas a vector has both
• What unit is used for forces?

  Newtons
• Give three examples of contact forces

  • Air resistance
  • Normal contact force
  • friction
• Give three examples of a Non-contact force

  • Gravity
  • electrostatic
  • magnetism
• What makes weight different from mass?

  Mass is constant everywhere and weight depends on the gravitational field strength of where you are
• What is the equation for weight?

  Weight= Mass x Gravitational field strength
• What is the equation for work done?

  Work = Force x distance
• State Newtons third law.

  If object 1 exerts a force on object 2, object 2 will exert a force on object 1 with equal magnitude but in an opposite direction
• What is resultant force?

  Different forces acting it the same direction on the same object added to make a total force on the object (this is called the resultant force)
• What is velocity?


  Speed in a given direction
• What is the equation for the moment of a force?


  Moment= force x perpendicular distance to the pivot
• State the condition for equilibrium.

  Clockwise moments= anti-clockwise moments (CW=ACW)
• State Newtons first law

  If there is zero resultant speed on an object it will either stay at a constant speed or remain stationary