Chapter 3

Study guide

Gravity:

• Definition• What affects gravity• How air resistance and surface area affect the

force of gravity• What happens to objects when dropped in a

vacuum (no air)• Free fall means the object is weightless so the

force of gravity would be equal on the object and Earth.

Weight:

• Definition• Units used to measure weight• Can it change?

Mass:

• Definition• Tool used to measure mass• Units used to measure mass• Can it change?

Friction:

• Definition• Know the 4 types and what they are (be able to

identify by examples)• Know that friction produces heat

Pressure:

• Know what happens to pressure below and above sea level (does it increase? decrease?)

• Units used to measure pressure• Formula for pressure

Buoyancy:

• Definition• Bernoulli’s Principle (what is states and examples)• Pascal’s Principle (what it states and examples)

Density:

• Formula• Units• What happens when an object is placed in a

substance that is more dense and less dense?