Forces and Changes in Motion

The ______ the mass of an object, the greater the force needed to overcome the force of gravity.

• greater

• changing of

• absense of

• lesser

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A ball rolling on the grass will slow down and eventually stop due to ______ of friction acting on it.

• unbalanced force

• change

• lack

• balanced force

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What happens when two magnets with the same poles are placed next to each other?

• They will attract.

• They will repel.

• They will not move.

• They will pull together.

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What kind of force will anyone use to remove the weeds from the garden?

• Both pushing and pulling force

• A pushing force

• A pulling force

• Nothing, they will not do anything.

A magnet will attract which of the following objects?

• rubber

• metal

• plastic

• paper

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Brian and Emily are testing different paper airplane designs to see which will allow a plane to go the farthest. Emily folds her plane and attaches a paperclip to the front of it. After she throws the plane, it travels about fifty feet and then starts to fall to the ground.  
 Why does the plane eventually fall to the ground?

• The force of air resistance stops acting on the plane

• The plane was not designed to carry a load like the paperclip

• The force of gravity is greater than the forces keeping the plane in the air

• The paperclip creates a magnetic force that attracts the plane to the ground.

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While Carmen is at the park with her family, she walks up to a wishing well. She throws a penny down the well, and she hears a splash at the bottom. Which of the following best describes what happens as the penny falls?

• The force of gravity is equal to the air resistance acting on the penny

• The magnetic force of the well attracts the penny and causes it to fall even faster

•   The force of friction acts against air resistance, causing the penny to fall even faster

• The force of air resistance acts against gravity, but it is not enough to overcome gravity

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Because the force of gravity is so strong, it appears to attract all objects equally, regardless of mass. Which of the following is illustrated by this idea?

• Earth orbits the Sun in the same amount of time it takes the Moon to orbit Earth

• A rubber ball will bounce much higher than a wooden ball, even if they weigh the same

• Magnets can both repel and attract each other, depending on how they come into contact

• A bowling ball and a peanut will fall to the ground at the same rate when someone drops them

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Which of the following explains why a parachute makes a person falling from a great height fall more slowly?

• The parachute reduces the friction in the air

• The parachute pulls upward, so the fall is slower.

• The parachute causes air resistance, which slows the fall

• The parachute decreases the pull of gravity on the person wearing it

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David and Peter were moving a bookshelf across the carpet in their classroom. Even though they pushed as hard as they could, the bookshelf would only move a few inches at a time.  
Which of the following best explains what happened as they tried to push the bookshelf?

• The force of gravity opposed the motion of the bookshelf

• The force of friction opposed the motion of the bookshelf

• When they tried to push the bookshelf, air resistance acted against them

• When they pushed the bookshelf, the bookshelf pushed back with an equal and opposite force

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