Chapter 4: Newton's Laws of Motion
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