Unit 1 Review

Displacement vectors of 5 km north, 3 km east, 2 km south, and 3 km west combine to a total displacement of

• 3 km north

• 13 km west

• 0 km

• 2 km south

Examine Figure 11-1 above. If you were standing under the tree, which object would appear to be moving?

• the tree

• the airplane

• the boy

• the building

Instantaneous speed is measured

• at the starting point

• when the object reaches its destination

• at a particular instant.

• over the duration of the trip.

An object that is accelerating may be

• slowing down.

• gaining speed.

• changing direction.

• all of the above

A passenger in the rear seat of a car moving at a steady speed is at rest relative to

• the other side of the road.

• a pedestrian on the corner ahead.

• the front seat of the car.

• a bird flying in the other direction.

The property of matter that resists changes in motion is called

• friction.

• gravity.

• inertia.

• weight

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The acceleration due to gravity on the surface of Mars is about one-third the acceleration due to gravity on Earth’s surface. The weight of a space probe on the surface of Mars is about

• nine times greater than its weight on Earth’s surface

• three times greater than its weight on Earth’s surface

• one-third its weight on Earth’s surface.

• the same as its weight on Earth’s surface.

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The universal force that is effective over the longest distance is

• electromagnetic.

• strong nuclear.

• weak nuclear.

• gravity.

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The centripetal force acting on a satellite in orbit

• acts as an unbalanced force on a satellite

• changes the direction of the satellite.

• is a center-directed force.

• all of the above

Tags

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NGSS.MS-PS2-4

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On what principle are hydraulic systems based?

• Bernoulli’s principle

• the Newton

• Pascal’s principle

• Archimedes' principle