𝓈𝒸𝒾ℯ𝓃𝒸ℯ

• What is mass?

  The amount of matter in an object
• What is weight?

  The force caused by gravity on an object
• What unit is mass measured in?

  Kilograms (kg)
• What unit is the force weight measured in?

  Newtons (N)
• What happens to your mass when you visit the moon?

  Your mass stays the same
• What happens to your weight if you visit Jupiter?

  Your weight increases
• What is the formula used to calculate the force of weight?

  Weight = mass x gravity
• What is the force of gravity on Earth?

  $10 \text{ N/kg}$
• If your mass is $50 \text{ kg}$, calculate your weight on Earth.


  $500 \text{ N}$
• What is meant by balanced forces?

  Forces acting in opposite directions of equal size
• How do balanced forces affect motion?

  They do not change the object's motion
• What is meant by unbalanced forces?

  Forces acting in opposite directions of unequal size
• How do unbalanced forces affect motion?

  They change the speed or direction of an object
• In science, which units are used for speed?

  Metres per second (m/s)
• What is the formula used to calculate speed?

  Speed = distance/time
• What is density?

  Mass of 1 cm³ of a substance
• If you had two liquids of different densities, which would float on top?

  The low density liquid
• How do you measure the density of a solid and liquid?

  Mass divided by volume
• What is surface friction?

  The force between two surfaces rubbing together
• Write down three situations where there is a large amount of surface friction.

  Brakes and tyre, tyre and road, rock climbing
• Write down three situations where you want less friction.

  Ski and snow, ice skate and ice, moving parts in car engine
• What is lubrication?

  A substance placed between moving parts
• What causes heat to be generated in moving systems?

  Friction between moving parts
• What do we call the air friction force?

  Drag or air resistance
• How does streamlining reduce drag?

  It makes the object smooth and pointed
• How do forces affect the motion of an object?

  They change the speed or direction of the object
• What is meant by the term "force"?

  A push or pull on an object
• How does a force launch an object?

  By applying a push or pull to it
• What is the formula for calculating weight?

  Weight = mass x gravity
• What is the gravitational acceleration on Earth?

  $10 \text{ m/s}^2$
• What happens to your weight if you visit the moon?

  Your weight decreases
• What happens to your weight if you visit Jupiter?

  Your weight increases
• What is the formula for calculating speed?

  Speed = distance/time
• What is the unit for speed?

  Metres per second (m/s)
• What is the relationship between mass and weight?

  Weight is mass multiplied by gravity
• How does density affect buoyancy?

  Lower density liquids float on higher density liquids
• What is the effect of surface friction on motion?

  It opposes the motion of objects
• What is the purpose of lubrication?

  To reduce friction between moving parts
• What is drag?

  The resistance force acting against motion
• How does streamlining affect drag?

  It reduces the area hitting air particles