Force and Motion - Fill in the Blanks

Motion occurs when an _______________________ force acts on an object.

• unbalanced
• balanced
• energy
• momentum

Objects typically do not travel at a ________ speed.

• constant
• average

Objects typically travel at an ___________ speed.

• constant
• average

Every object ____________ a change in motion.

• resists
• accepts
• accelerates with 
• stops

The amount of resistance depends on an object’s _____________.

• mass
• speed
• momentum
• force

Large force and small mass = _____________________ acceleration.

• great
• small
• no
• static

Small force and large mass = _____________________ acceleration.

• great
• small
• no
• static

_____________________ has friction.

• Everything
• Nothing
• Somethings
• Special things

When two surfaces rub together, they become ______________.

• warm
• cold
• balanced
• frozen

Choose the BEST answer:
Friction is caused by ______________________________________________.

• rough surfaces OR electrical attractions between atomic particles in surfaces
• smooth surfaces OR no attractions between atomic particles in surfaces
• rough surfaces 
• electrical attractions between atomic particles in surfaces