U1 Lessons 2-3

Which of the following is an “old” idea that Newton was taught while he was in school?

• The planets revolve around the sun.

• Earth is the center of the solar system.

• Math that describes the motion of the planets.

• Gravity is a force that acts on objects in a solar system.

How did Newton develop his scientific laws?

• He studied the work of Greek philosophers.

• He created new ideas based on a few lucky guesses.

• He wrote them all down after dreaming about them.

• He combined the ideas and observations of many other scientists.

In science, force refers to

• a moving object.

• the way objects interact.

• a push or pull on an object.

• a description of an object's movement.

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When do forces always occur?

• when two objects interact

• when two objects are in motion

• when one object is larger than another

• when two objects are of the same size

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Forces are described using

• speed and direction.

• motion and distance.

• strength and direction.

• strength and distance.

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Newton’s third law of motion states that when an object exerts a force on a second object, the second object

• exerts a weaker force in the opposite direction.

• exerts a stronger force in the opposite direction.

• exerts a force with equal strength in the same direction.

• exerts a force with equal strength in the opposite direction.

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In the example of a swimmer interacting with a wall, the swimmer

• exerts a force on the wall only.

• exerts no force on any object.

• exerts a force on herself only.

• exerts a force on both herself and the wall.

A force pair is

• two interacting forces that exert a single force.

• two interacting objects that exert a single force.

• two interacting forces that act on different objects.

• two interacting objects that act on different forces.

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Two pendulums colliding are an example of

• a force pair where both forces can be seen.

• a force pair where only one force can be seen.

• a force pair where the forces cancel each other out.

• a force pair where the strength of forces is doubled.

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Newton was able to verify that his third law was correct by

• creating a new mathematic equation to calculate force.

• rolling balls of different size down a hill to test their speeds.

• experimenting with pendulums of different sizes and materials.

• dropping objects from different heights and seeing how fast they fall.