Gravity and Friction Test Prep

Friction is a

• CONTACT force

• NONCONTACT force

Gravity is a

• CONTACT force

• NONCONTACT force

USING A MAGNET is a

• CONTACT force

• NONCONTACT force

KICKING A BALL is a

• CONTACT force

• NONCONTACT force

What is the main difference between a contact force and a noncontact force?

• A contact force works without touching another object, while a noncontact force does not.

• A contact force works by touching another object, while a noncontact force does not.

• A contact force pushes an object, while a noncontact force pulls an object.

• A noncontact force pushes an object, while a contact force pulls an object.

  
  

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Ball 1 has a mass of 10 g. Ball 2 has a mass of 30 g. Which prediction tells how gravity will act on the balls when dropped?

• The pull of gravity will be the same on each ball.

• The pull of gravity will not act on either ball.

• The pull of gravity will be greater on ball 1.

• The pull of gravity will be greater on ball 2.

Which of the following statements best describes a POSITIVE ACTION?

• a force that works WITH the force of gravity

• a force that works AGAINST the force of gravity

Which of the following statements describes an object in free fall?

• Multiple forces act on the object at the same time.

• The object is pulled downward by a single force acting on it.

• The object can move in multiple directions as it falls.

A force that acts when an object ROLLS across a surface.

• sliding friction

• rolling friction

• fluid friction

A force that acts when 2 objects RUB against each other.

• sliding friction

• rolling friction

• fluid friction