Chapter 4: Newton's Laws of Motion

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An object moves with a constant velocity. Which of the following cannot be true for the object?

A single force acts on the object

An object accelerates when it experiences a non-zero net force. Which of the following statements is always true?

The object's acceleration is in the same direction as the net force that acts upon it

A model rocket of mass, m, is fired upward from a launch pad with some initial speed, v. A gravitational force is exerted on the rocket

at all points in its motion

A race car moving quickly around a track collides with a mosquito, which splatters on the car's windshield. Which object experiences a greater magnitude impact force?

both experience the same force

A race car moving quickly around a track collides with a mosquito, which splatters on the car's windshield. Which object experiences a greater magnitude acceleration?

the mosquito

When you sit in a chair there is necessarily a reaction force to the gravitational force acting on your body. Which of the following best describes this reaction force?

the force of gravity you exert on the Earth


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