# Newton's First Law of Motion. The Meaning of Inertia

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4.5Newton's First Law of Motion. The Meaning of Inertia

## Newton's First Law of Motion. The Meaning of Inertia Revision Questions

1. A 30 kg cart is moving along a horizontal surface. The friction coefficient between the floor and the cart's wheels is 0.4. What is the magnitude of the horizontal force acting at the cart in order to meet the conditions of Newton's First Law of Motion? Take g = 10 N/kg. 1. 300 N
2. 120 N
3. 72 N
4. 12 N

2. How many times more inert is a 800 kg rock than a 2 mg feather?

1. 400 times
2. 400 000 times
3. 40 million times
4. 400 million times

3. In which of the following situation the Newton's First Law of Motion is being applied?

1. A bullet fired at 400 N force from a gun at the beginning of its flight
2. A 40 kg girl sliding down a waterslide at increasing velocity
3. A pilot falling from an airplane before opening the parachute
4. A moving car whose speedometer always shows the value 80 km/h

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