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Questions and Answers
An astronaut has a mass of 75 kg on Earth. What would their mass be on the Moon?
An astronaut has a mass of 75 kg on Earth. What would their mass be on the Moon?
- Varies significantly depending on the astronaut's location on the Moon.
- 75 kg, as mass remains constant regardless of gravitational force. (correct)
- Approximately 12.5 kg, due to the Moon's lower gravity.
- 0 kg, as there is no gravity on the Moon.
Two people are pulling a box in the same direction. One person is pulling with a force of 150 N, and the other is pulling with a force of 200 N. What is the resultant force on the box?
Two people are pulling a box in the same direction. One person is pulling with a force of 150 N, and the other is pulling with a force of 200 N. What is the resultant force on the box?
- 50 N in the direction of the smaller force.
- 350 N in the direction of the applied forces. (correct)
- 50 N in the direction of the larger force.
- 350 N in the opposite direction of the applied forces.
A book is resting on a table. Which of the following statements best describes the forces acting on the book?
A book is resting on a table. Which of the following statements best describes the forces acting on the book?
- Only the gravitational force is acting on the book.
- The gravitational force is greater than the normal force.
- The book experiences an unbalanced force, causing it to accelerate downwards.
- The gravitational force is equal to and opposite the normal force, resulting in balanced forces. (correct)
A rocket accelerates upward from Earth. Which statement accurately describes the forces acting on the rocket?
A rocket accelerates upward from Earth. Which statement accurately describes the forces acting on the rocket?
Which of the following situations would result in an object moving at a constant velocity?
Which of the following situations would result in an object moving at a constant velocity?
Flashcards
Periodic Table
Periodic Table
An organized chart of all known elements by atomic number and properties.
Force
Force
A push or pull that can change the motion of an object.
Measuring Forces
Measuring Forces
Using a spring balance or Newton meter to quantify a force.
Balanced Forces
Balanced Forces
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Resultant Force
Resultant Force
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Study Notes
- Forces describe an interaction that, when unopposed, will change the motion of an object.
- Forces can cause objects to start moving, stop moving, speed up, slow down, or change direction.
Measuring Forces
- Forces are measured in newtons (N).
- A newtonmeter (or force meter) is used to measure forces, often employing a spring whose extension is proportional to the force applied.
Balanced and Unbalanced Forces
- Balanced forces are equal in size and opposite in direction, resulting in no change in motion.
- Unbalanced forces are not equal in size and/or direction, resulting in a change in motion.
- If forces are balanced, an object either remains at rest or continues to move at a constant velocity.
- If forces are unbalanced, an object accelerates in the direction of the resultant force.
Resultant Forces
- The resultant force is the single force that has the same effect as all the individual forces acting on an object.
- To find the resultant force of forces acting in the same direction, you add them together.
- To find the resultant force of forces acting in opposite directions, you subtract the smaller force from the larger force.
- When forces act at an angle, vector addition is used to find the resultant force (more complex).
Mass and Weight
- Mass is the amount of matter in an object, measured in kilograms (kg).
- Weight is the force of gravity acting on an object, measured in newtons (N).
- Weight can be calculated using the formula: Weight = mass × gravitational field strength (W = mg)
- Gravitational field strength (g) varies depending on the location (e.g., on Earth, g ≈ 9.8 N/kg).
- Mass remains constant regardless of location, but weight changes depending on the gravitational field strength.
Space
- Space is the boundless three-dimensional extent in which objects and events have relative position and direction.
- It is studied extensively in astronomy and astrophysics.
- Key aspects of space include celestial objects, gravitational forces, and the vacuum of space.
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Description
Understand forces and their impact on motion. Balanced forces result in no change in motion, while unbalanced forces cause acceleration. Learn about measuring forces in newtons and determining resultant forces.
