Topic 2 Lesson 4 Friction and Gravitational Interactions

The bumpy pattern on the soles of shoes is called the tread. Melanie and Keisha are at the store looking at the treads on different basketball shoes. They want new shoes so that they do not slide on the basketball court. Which of these situations produces the most friction between the shoes and the floor?

• a girl with a less mass wearing shoes with more tread

• a girl with a less mass wearing shoes with less tread

• 
  a girl with greater mass wearing shoes with more tread

• a girl with greater mass wearing shoes with less tread

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An astronaut in space might feel weightless, but there still is a gravitational attraction between the astronaut and Earth. Which two factors affect this gravitational attraction?

• the masses of Earth and the astronaut

• the weight of Earth and the astronaut

• the rotation of the Earth

• the distance between Earth and the astronaut

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David delivers meals to elderly people once a week. He uses a cart to move the meals. The cart has four smooth wheels. Which type of friction acts between the cart wheels and the sidewalk?

• sliding friction

• rolling friction

• 
  fluid friction

• static friction

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Daphne is a pilot for a package delivery service. As her plane takes off and travels away from the Earth’s surface, its gravitational potential energy increases. Which three factors affect the plane’s gravitational potential energy?

• mass, volume, surface area

• mass, fluid friction, height

• acceleration due to gravity, mass, height

• height, acceleration due to gravity, volume

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Miguel learned about the difference between mass and weight. He wanted to investigate what he would weigh at different locations in our solar system. He used this table to organize data he found out about Earth, the moon, Neptune, and Mercury. He needs to fill out the rest of the table.

How would Miguel's mass on Neptune compare to his mass on Earth?

• Greater
• Less
• Cannot be determined
• The same

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What is the force that acts between two objects due to their mass?

• magnetic force

• electric force

• frictional force

• gravitational force

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Which of the following is an example of a contact force?

• Friction

• Electricity

• Magnetism

• Gravity

What is the SI unit of force?

• Newton (N)

• Second (s)

• Meter (m)

• Kilogram (kg)

Which of the following is an example of a non-contact force?

• Tension

• Gravity

• Friction

• Magnetism

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