Unit 6 Forces and movement

Contact forces...

• ...are when there´s physical contact with an object. An example is Gravity.

• ...don´t need to make physical contact for an object to move.

• ...are when there´s physical contact with an object. An example is pushing a ball with your foot.

Magnetism and gravity are

• Contact forces

• Non-contact forces

• Friction

Gravity __________ the things to the ground

• PUSHES

• PULLS

Write the three types of friction that you know

____________ friction happens when a round object rolls on top of a solid surface

• Sliding

• Rolling

• Fluid

Friction is a type of contact force that happens when an object moves against another solid object, liquid or gas, and causes...

Fluid friction happens when an object meets a __________ as it moves

• liquid

• gas

• liquid or gas

• solid

Letter A shows ______________________ force

Letter B shows _______________________ force

_________________ is an important factor on how ships float. It's the measure of how much there is of a certain type of matter in a specific size of space.

• Volume

• Mass

• Density

• Force