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Questions and Answers
What type of motion does the satellite experience in its orbit?
What will happen to the velocities of the skaters after they push off from each other?
Which option best describes the centripetal force?
According to Newton's First Law of Motion, what occurs when an external force acts on an object?
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What describes the reaction force when you push a box with 10 N on a frictionless table?
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Which law explains why a satellite maintains a constant speed in its orbit?
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What is the effect of friction on an object's motion on a frictionless surface?
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When one skater is much lighter than the other during a push-off, what principle is mainly illustrated?
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Which force is primarily responsible for keeping an object moving in a circular path?
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What is the outcome when the net external force on an object is zero?
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Study Notes
Distinctions Between Mass and Weight
- Mass measures the amount of matter in an object and is constant regardless of location.
- Weight is the gravitational force acting on an object, varying with gravitational field strength.
- Mass and weight are not interchangeable; mass does not change based on location.
Average Velocity of a Cyclist
- Average velocity can be calculated as total distance divided by total time.
- If a cyclist covers 60 km in 3 hours, the average velocity is 20 km/h.
Motion of a Car with Constant Acceleration
- A car accelerating from 0 to 20 m/s in 5 seconds continues at a constant velocity of 20 m/s for an additional 10 seconds.
- The motion during the last 10 seconds is categorized as moving with constant velocity, hence acceleration is zero during that period.
Vertical Motion of a Thrown Object
- An object thrown straight up reaches zero velocity at its peak, while acceleration remains constant due to gravity.
- At peak height, the acceleration does not become zero; it is still influenced by gravitational force.
Free Fall of Objects on the Moon
- Objects fall at the same rate in a vacuum due to equal acceleration from gravity, regardless of mass.
- The hammer and feather hit the surface simultaneously on the moon due to lack of air resistance.
Centripetal Acceleration in Circular Motion
- Centripetal acceleration depends on the square of the velocity and the radius of the circle.
- If Bicycle X travels three times faster than Bicycle Y, its centripetal acceleration is nine times greater, not three times.
Characteristics of Satellite Motion
- A satellite in a stable orbit experiences uniform circular motion, maintaining a constant speed while continuously changing direction.
Newton's Laws of Motion
- Newton's First Law states that an object will remain at rest or move at a constant velocity unless acted upon by an external force.
- Newton's Third Law asserts that for every action, there is an equal and opposite reaction.
Reaction Forces in a Frictionless Environment
- When pushing a box on a frictionless table with a force of 10 N to the right, the reaction force is equal and opposite, pushing back to the left with 10 N.
Defining Centripetal Force
- Centripetal force is the force directed towards the center of a circular path that keeps an object in circular motion, opposing inertia.
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Description
Test your understanding of key physics concepts in Module 1-7, focusing on mass and weight distinctions, as well as the conversion of physical quantities using metric prefixes and scientific notation. This multiple-choice quiz will challenge your knowledge and application of these principles.
