unit 1 module I

An airplane leaves New York to fly to Los Angeles. It travels 3,850 km in 5.5 hours. What is the average speed of the airplane?

• 700 km

• 700 hours

• 700 km/hour

• 700 hours/km

The law of universal gravitation says all bodies attract each other. If you drop a cup, it falls to Earth. Why doesn't the gravitational attraction between your hand and the cup keep the cup from falling?

• The law of universal gravitation only applies to planets in space.

• There is a gravitational attraction between you and the cup, but Earth's gravity

  is stronger, so Earth's gravity pulls the cup down.

• The gravitational attraction between you and the cup is so strong that the force pushes the cup down.

• There is no gravitational attraction between you and the cup, so Earth's gravity pulls the cup down.

  Houghton Mifflin

• car 1

• car 2

• car 3

• car 4

• The net force is acting in an upward direction.

• The net force is acting to the left.

• The net force is moving to the right.

• The net force is zero and all the forces are balanced.

• The satellite would continue to orbit Earth.

• The satellite would fall to Earth.

• The satellite would move into space in a straight line.

• The satellite would stop moving.

Julia is in a car with her father. The car is undergoing centripetal acceleration. What is happening to the car?

• The car is changing direction at a constant speed.

• The car is changing direction and speeding up.

• The car is stopping suddenly.

• The car is slowing down.

12 Rajiv made a model of a boat. When he places it in water, it sinks. According to Archimedes' principle, why does the boat sink?

• A The boat is too small.

• The buoyant force is less than the boat's weight.

• The buoyant force is equal to the boat's weight.

• The buoyant force is greater than the boat's weight.