Friction and Gravity affects movements

Which of the following best describe friction?

• It is a force that occurs when surfaces touch each other

• It is a force that occurs between solids and liquid

• It is a force that occurs only on rough surfaces

• It is a force that occurs between solids

Which surface will produce the least amount of friction?

• smooth glass tabletop

• gravel running track

• grassy soccer field

• fuzzy soccer field

Which of the following is not a type of friction?

• fluid

• rolling

• static

• wind

What are you going to put in a surface to reduce the friction on it?

• piece of wood

• piece of cloth

• lubricant

• stone

If you run down the sidewalk and stop quickly , you can stop because of the ____________ between your shoes and the cement.

• friction

• gravity

• motion

• Shoes

Which of the followings helps in reducing friction?

• lubricants, rollers, wheels and bearings

• pebbles, rocks, mud

• cloth, clay, rubber

• gravel, sand, soil

Occurs when two objects rub againts each other. It is a force that slows down or stops objects

• friction

• gravity

• motion

• push or pull

Why is it easy to slip when there is water on a smooth floor?

• The water is a lubricant and reduces the friction between your feet and the floor.

• The friction between your feet and the floor changes from kinetic to static friction.

• The friction between your feet and the floor changes from sliding

• The water increases the friction between your feet and the floor

These two factors determine the strength of the force of friction

• how hard the surfaces push together and the types of surfaces involved

• how big the objects are and how hard you push them

• how fast the objects are going and on what planet

• speed and light

What will happen if we don’t have friction?

• Life would be very easy.

• We can walk easily.

• We will float.

• We can’t walk