Mass, Weight, and Force Quiz

Mass and Units

• Mass is a measure of how heavy an object is.
• The gram (g) is a small unit of mass used to measure light objects.
• The kilogram (Kg) is a larger unit of mass used to measure heavier objects.
• 1 kilogram (Kg) is equal to 1,000 grams (g).

Forces

• A force is a push or pull.
• Forces can be either balanced or unbalanced.
• When forces are balanced, the object doesn't move.
• When forces are unbalanced, the object will begin to move, stop moving, change direction, speed up, or slow down.

Balanced and Unbalanced Forces

• Unbalanced forces cause a change in motion by changing the object's speed or direction.
• Balanced forces do not cause a change in motion.
• When two forces are acting on an object and are not equal in size, they are unbalanced.
• When two forces acting on an object are equal in size but opposite in direction, they are balanced.

Types of Forces

• Air resistance force is friction between an object and the air.
• Air resistance is caused by an object bumping into atoms and molecules when moving through the air.
• Applied force is when a living creature puts pressure on an object.