3rd QT Science 6 - Review

Which of the following statements best describes friction?

• It is a force that occurs between solids.                                  

         

• It is a force that occurs only on rough surfaces                        

• It is a force that occurs between solids and liquids.

             

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

Why can’t a ball roll continuously on a rough surface?

• The rough surface is not made for balls to roll.

• The force which enables the ball to move is released.

• The rough texture of the surface blocks the movement of the ball

• The rough texture of the surface permits the movement of the ball.

What eventually happens to a moving object when it moves along a surface?

• It will continuously move.

• It will stop immediately

• It will eventually slow down and stop.

• It will move either to the right or left side and stop.

Which moves fastest on a flat surface?   

           

• Ball     

•   Wooden box 

•  Block of wood 

• Sheet of paper

A bicycle moves faster on a cemented road than on a bumpy road. Why?

• Friction is greater on a cemented road.

• There is no friction on a cemented road.

• Friction is lesser on a cemented road

• The bicycle can roll only on a cemented road.

Which shows that friction is undesirable?

• Pushing furniture

• Walking on wet floors

• Lighting a matchstick

• Approaching a stoplight

Which of the following statements best describes gravity?

• a force that pulls objects toward each other

• a force that opposes the motion of objects that touch as they move past each

• a measure of the force of gravity on an object

• a measure of the amount of matter in an object

If the distance between two bodies is doubled, the gravitational force between them is _____.

• doubles

• reduces to half

• remains constant

• reduces to one-fourth

Which of these will feel the biggest gravitational pull on earth?

• A 1000-kg elephant

• A 100-kg boxer

• A 100-g mouse

• A 10-kg bicycle

A baseball and a sheet of paper are dropped at the same time from the same height. What will occur if there is no air resistance?

• The baseball will land first.

• The baseball will float slowly through the air.

• The paper will float slowly through the air.

• The baseball and the paper will land at the same time.