Isaac Newton and Forces

According to Newton, what kinds of objects are affected by gravity?

• Only objects inside the earth's atmosphere, like apples.

• Only objects that orbit the sun, like planets.

• Only objects with a lot of mass, like human beings.

• All objects in the universe.

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How is the moon's orbit around the earth related to an apple falling from a tree?

• The earth's gravity keeps the moon in orbit, and also pulls objects toward the ground.

• The earth, the moon, and an apple are all spherical, so they all have gravity.

• The moon's gravity holds apples on tree branches, while the earth's gravity pulls apples toward the ground.

• The moon's gravity affects bodies of water; the earth's gravity affects solid objects.

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What is true about all forces?

• They are unbalanced

• They involve more than one object

• They cause objects to move

• They cancel each other out

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If the net force on an object is zero, what can you conclude?

• The object is not accelerating

• The object is not touching anything

• The object is not moving

• The object is slowing down

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Which would be the correct location of drag in this diagram?

• A

• B

• C

• D

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What can you infer about an object moving at a constant velocity?

• No forces are acting on it

• Gravity is exerting the strongest force on it

• The forces acting on it are in balance

• It is stationary

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Acceleration occurs when an object is subjected to a(n):

• Force

• Balanced force

• Unbalanced force

• Contact force

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What is true of non-contact forces?

• They are always stronger than contact forces

• They always drive two objects farther apart

• They become weaker with distance

• They can not make two objects touch

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Which of the following statements is always true?

• An object at rest has no forces acting on it

• Unbalanced forces lead to a change in speed or direction

• Gravity always leads to an unbalanced force

• The net force on a moving object can never be zero

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What will happen if you're in a car, and the driver slams on the brake?

• You will stop moving.

• You will continue moving forward.

• You will gradually slow down.

• You will speed up.

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