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Difficulty: EasyNewton's First Law (Inertia)

Based on Newton's First Law of motion, how does an unbelted passenger's body tend to react relative to a vehicle in various situations? Pair each specific vehicle maneuver with the passenger's corresponding initial directional tendency.

  • The vehicle suddenly slams on the brakes.The passenger's body tends to slide or lean forward.
  • The vehicle rapidly accelerates from a dead stop.The passenger's body is pressed backward into the seat.
  • The vehicle makes a sharp, sudden turn to the left.The passenger's body tends to slide or lean to the right.
  • The vehicle cruises at a steady 60 mph on a straight, flat road.The passenger's body experiences no change in perceived direction.

Answer

Braking pairs with sliding forward; accelerating pairs with pressing backward; turning left pairs with leaning right; and steady cruising pairs with no directional change.
Each pair correctly applies the concept of inertia. A passenger's body will always resist changes in the vehicle's speed or direction, maintaining its current state of motion or rest until an unbalanced force acts upon it.

Step-by-Step Solution

1
Analyze the sudden braking scenario.
The passenger's body tends to slide or lean forward.
Due to inertia, an object in motion tends to stay in motion. The car slows, but the passenger's body wants to continue at its original speed.
2
Analyze the rapid acceleration scenario.
The passenger's body is pressed backward into the seat.
An object at rest tends to stay at rest. As the car shoots forward, the passenger's mass resists the forward motion, causing them to lag behind.
3
Analyze the sharp left turn scenario.
The passenger's body tends to slide or lean to the right.
Objects in motion tend to move in a straight line. The car curves left, but the body attempts to travel straight, appearing to move right relative to the vehicle's interior.
4
Analyze the steady cruising scenario.
The passenger's body experiences no change in perceived direction.
With a constant velocity and no change in direction, the net force is zero, and the body remains in equilibrium with the car.

Key Concept

Newton's First Law (Inertia)
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Topics

Newton's First Law (Inertia)

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