year 9 (p)

• What is the motion characteristic of sliding friction?

  Surfaces move against each other
• What is the motion characteristic of static friction?

  No motion until force is overcome
• What are the types of friction and their characteristics?

  • Static friction: Holds things still, very strong
  • Sliding friction: Makes sliding harder, moderate strength
  • Rolling friction: Easiest to overcome, weakest
• How do the three types of friction shown in the image differ in their effects on the object's motion?

  • Static friction prevents motion
  • Sliding friction allows sliding motion
  • Rolling friction allows rolling motion
• What does the gravitational force cause objects to do?

  It causes objects to roll down slopes
• How can friction be both helpful and annoying?

  • Helpful: Keeps objects still (e.g., heavy boxes)
  • Annoying: Makes it hard to push or slide objects
• What is friction?

  A force that opposes motion
• What are the three main types of friction?

  • Static friction
  • Sliding friction
  • Rolling friction
• How does the steepness of a hill affect the speed of an object rolling down?

  A steeper hill makes the object go faster
• What does rolling friction do?

  It makes it easy to roll things
• How does sliding friction affect movement?

  It makes it a little harder to slide
• How does the angle of inclination affect acceleration?

  Steeper angles increase acceleration
• What type of energy transforms as an object rolls down a slope?

  Gravitational potential energy transforms into kinetic energy
• What is the motion characteristic of rolling friction?

  Object rolls over surface
• What type of friction is compared to a monster that makes sliding harder?

  Sliding friction
• If you wanted to minimize the friction on an object, which type of friction would you want to have?

  Rolling friction
• Why does the soccer ball experience a downward force as it is dropped from a specific height?

  Due to the gravitational force acting on the ball
• What type of friction is described as a super strong monster?

  Static friction
• What scenario illustrates static friction?

  Pushing a heavy box
• What is the effect of mass on the force of an object rolling down a slope?

  More mass means more force
• What is the name of the type of friction shown in the first image?

  Static Friction
• How does the strength of different types of friction compare?

  • Static friction: strongest
  • Sliding friction: moderate
  • Rolling friction: weakest
• How does friction affect movement?

  It tries to stop things from moving
• What is the weakest type of friction mentioned?

  Rolling friction
• How does friction affect the speed of an object on a slope?

  More friction means slower speed
• What does static friction do?

  It holds things still until enough force is applied
• How does gravitational force affect a ball falling vertically?

  It pulls the ball downward toward Earth
• What is the name of the force acting on the rock rolling downhill?

  Gravitational force
• What factors affect the speed of an object rolling down a slope?

  • Angle of inclination
  • Mass
  • Friction
• Why does a heavier object roll down a slope faster?

  Because it has more mass and momentum
• How do the factors of angle, mass, and friction interrelate in affecting speed?

  All factors influence the acceleration and speed
• What is one factor that affects the speed of an object rolling down a slope?

  How steep the hill is
• What is the role of friction when an object rolls down a slope?

  It slows the object down
• What happens to the speed of a heavy object rolling down a slope?

  It goes faster
• What factors contribute to the speed of an object rolling down a slope?

  • Steepness of the hill
  • Weight of the object
  • Amount of friction
• What combination of factors makes an object roll faster down a slope?

  Steeper hill, heavier object, less friction
• How does friction affect the motion of an object rolling down a slope?

  Higher friction slows down motion