Here are the answers to your questions based on Newton's Laws of Motion:
- You exert a net force of 4 N to the right on an object with a mass of 8 kg, and the object will accelerate at 0.5 m/s² to the right.
Answer: b. Newton's Second Law of Motion
This law states that force equals mass times acceleration (F = ma). In this case, the net force causes the object to accelerate.
- A hockey puck slides on ice.
Answer: a. Newton's First Law of Motion
This law states that an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net external force. The puck continues to slide due to inertia until a force (like friction) acts on it.
- My car hits a mosquito, and the mosquito hits back, equally.
Answer: c. Newton's Third Law of Motion
This law states that for every action, there is an equal and opposite reaction. The car exerts a force on the mosquito, and the mosquito exerts an equal force back on the car.
- Mrs. Hankinson has a zero total external forces acting on her - she keeps moving at a constant velocity, if she is already moving.
Answer: a. Newton's First Law of Motion
This law indicates that an object will remain at rest or move in a straight line at constant speed unless acted upon by a net external force. Since there is no net external force, she continues moving at a constant velocity.
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