Earth's magnetic field is a strong force due to it's magnetic core. Which one of the following is NOT a way in which the magnetic field is used?

• Used with a rock, Lodestone, as a compass.

• 
  Guiding Loggerhead Sea Turtles back to the sea.

• Pushing magma up through the interior of earth.

• 
  Combining with particles from the sun's corona to create light shows at the poles.

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Which object experiences the greatest gravitational force?

• 
• 
• 
• 

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Friction is the force that one surface exerts on another when they rub together. Friction works in the direction opposite to the motion, causing the object to slow down. What is one way you could reduce the friction between two surfaces?

• Carpet the surfaces.

• Put oil on the surfaces.

• 
  Put sand on the surfaces.

• Allow one of the surfaces to rust.

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Which example best demonstrates how unbalanced forces change the speed of an object's motion?

• A child on a bicycle braking at a stop sign.

• A child singing a song.

• A child sitting in a chair reading a book.

• A child walking around the corner of a school hallway.

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Which example best represents an object with balanced forces acting upon it?

• A boat moving through the water.

• A book sitting on a high shelf.

• A wagon rolling down a steep hill.

• A baseball thrown in the air.

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When the net force of opposite forces is zero, the forces are

• Unbalanced
• 
  Not even

• Unleveled
• Balanced

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The moon and other satellites rotate around the earth. Identify the force that keeps these satellites in orbit.

• Wind resistance
• Friction
• Gravity
• Magnetism

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A race car drives around a turn on a flat race track at constant speed. Identify the force that allows the race car to travel around the turn?

• Air resistance applies the force needed.

• 
  No force is required to go around the turn.

• 
  The weight of the car applies the force needed.

• The friction between the tires and the track applies the force needed.

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A book is pushed across the table by a student. The student stops pushing on the book and the book slows down and stops. The force stopping the book is a force known as

• inertia
• friction
• magnetism
• gravity

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The kicker has made contact with the football. In order for the ball to follow the path shown by the dotted line, what must be true of the forces acting on the ball?

• 
  Force 1 must be the greatest.

• 
  Force 2 must be the greatest.

• 
  Force 3 must be the greatest.

• 
  Force 4 must be the greatest.

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