Worksheet # 1 - Newtons Laws of Motion If the statement is true ... - Free Printable
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Step-by-step solution for: Worksheet # 1 - Newtons Laws of Motion If the statement is true ...
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Show Answer Key & Explanations
Step-by-step solution for: Worksheet # 1 - Newtons Laws of Motion If the statement is true ...
Let's go through each question in the worksheet and solve it step by step, explaining the reasoning behind each answer.
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1. _________ Newton's first law of motion states that an object will not experience a change in motion unless acted upon by a(n) balanced force.
- Answer: False
Corrected word: *unbalanced*
Explanation: Newton’s First Law (Law of Inertia) says that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force. Balanced forces cancel out and do not cause acceleration.
✔ Corrected statement: "Newton's first law of motion states that an object will not experience a change in motion unless acted upon by an unbalanced force."
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2. _________ To increase acceleration of an object, you reduce its mass or increase the applied force.
- Answer: True
Explanation: From Newton’s Second Law: $ F = ma $ → $ a = \frac{F}{m} $. So, to increase acceleration ($a$), you can either increase force ($F$) or decrease mass ($m$). This statement is correct.
✔ No change needed.
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3. _________ Newton's third law of motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the same direction.
- Answer: False
Corrected word: *opposite*
Explanation: Newton’s Third Law states that for every action, there is an equal and opposite reaction. The forces are equal in magnitude but act in opposite directions.
✔ Corrected statement: "...in the opposite direction."
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4. _________ Resistance to change in motion is called stasis.
- Answer: False
Corrected word: *inertia*
Explanation: Resistance to change in motion is called inertia, not stasis. Stasis means a state of rest or no change, but it's not the scientific term for resistance to motion.
✔ Corrected statement: "Resistance to change in motion is called inertia."
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5. _________ Action and reaction forces acting in opposite directions do cancel out because they act on different objects.
- Answer: False
Corrected word: *do not*
Explanation: Action and reaction forces act on different objects, so they do not cancel out. Forces only cancel if they act on the same object. For example, when you push a wall, the wall pushes back equally, but these forces act on different bodies — yours and the wall’s — so they don't cancel.
✔ Corrected statement: "Action and reaction forces acting in opposite directions do not cancel out because they act on different objects."
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6. _________ If you lean against a wall, the wall pushes back on you with a(n) weaker force.
- Answer: False
Corrected word: *equal*
Explanation: According to Newton’s Third Law, the wall pushes back with an equal and opposite force. The force is not weaker; it’s exactly equal in magnitude.
✔ Corrected statement: "...with an equal force."
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7. Newton’s second law of motion states that an object’s acceleration depends on its ____________ and on the net force acting on it.
- Answer: mass
Explanation: Acceleration is inversely proportional to mass: $ a = \frac{F}{m} $. So, the greater the mass, the less the acceleration for the same force.
✔ Answer: mass
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8. Acceleration is measured in ____________.
- Answer: meters per second squared (m/s²)
Explanation: Acceleration is the rate of change of velocity over time: $ \text{m/s} ÷ \text{s} = \text{m/s²} $
✔ Answer: m/s²
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9. Force is measured in a unit called the ____________.
- Answer: newton (N)
Explanation: One newton is defined as the force required to accelerate a 1 kg mass at 1 m/s²: $ 1\, \text{N} = 1\, \text{kg·m/s²} $
✔ Answer: newton
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10. The smaller the mass of an object, the ____________ its inertia.
- Answer: less
Explanation: Inertia is directly related to mass. Less mass → less resistance to changes in motion → less inertia.
✔ Answer: less
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11. Newton’s second law of motion describes the relationship among force, mass, and acceleration. Write the equation.
- Answer: $ F = ma $
Explanation: This is the standard form of Newton’s Second Law: Net force equals mass times acceleration.
✔ Answer: $ \boxed{F = ma} $
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12. How does the diagram at the right illustrate Newton’s third law of motion?
*(Diagram shows a foot kicking a soccer ball)*
- Answer: When the foot kicks the soccer ball, the foot exerts a force on the ball, and the ball exerts an equal and opposite force on the foot. This is an example of Newton’s Third Law: for every action, there is an equal and opposite reaction. The forces are equal in magnitude but act on different objects (the ball and the foot).
✔ Sample Answer:
The diagram illustrates Newton’s third law because when the foot applies a force to the soccer ball, the ball applies an equal and opposite force back on the foot. These two forces are action-reaction pairs.
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1. False → unbalanced
2. True
3. False → opposite
4. False → inertia
5. False → do not
6. False → equal
7. mass
8. m/s²
9. newton
10. less
11. $ F = ma $
12. The foot exerts a force on the ball, and the ball exerts an equal and opposite force on the foot — demonstrating action-reaction pairs.
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Let me know if you'd like this formatted as a printable answer key!
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True/False Section
1. _________ Newton's first law of motion states that an object will not experience a change in motion unless acted upon by a(n) balanced force.
- Answer: False
Corrected word: *unbalanced*
Explanation: Newton’s First Law (Law of Inertia) says that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force. Balanced forces cancel out and do not cause acceleration.
✔ Corrected statement: "Newton's first law of motion states that an object will not experience a change in motion unless acted upon by an unbalanced force."
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2. _________ To increase acceleration of an object, you reduce its mass or increase the applied force.
- Answer: True
Explanation: From Newton’s Second Law: $ F = ma $ → $ a = \frac{F}{m} $. So, to increase acceleration ($a$), you can either increase force ($F$) or decrease mass ($m$). This statement is correct.
✔ No change needed.
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3. _________ Newton's third law of motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the same direction.
- Answer: False
Corrected word: *opposite*
Explanation: Newton’s Third Law states that for every action, there is an equal and opposite reaction. The forces are equal in magnitude but act in opposite directions.
✔ Corrected statement: "...in the opposite direction."
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4. _________ Resistance to change in motion is called stasis.
- Answer: False
Corrected word: *inertia*
Explanation: Resistance to change in motion is called inertia, not stasis. Stasis means a state of rest or no change, but it's not the scientific term for resistance to motion.
✔ Corrected statement: "Resistance to change in motion is called inertia."
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5. _________ Action and reaction forces acting in opposite directions do cancel out because they act on different objects.
- Answer: False
Corrected word: *do not*
Explanation: Action and reaction forces act on different objects, so they do not cancel out. Forces only cancel if they act on the same object. For example, when you push a wall, the wall pushes back equally, but these forces act on different bodies — yours and the wall’s — so they don't cancel.
✔ Corrected statement: "Action and reaction forces acting in opposite directions do not cancel out because they act on different objects."
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6. _________ If you lean against a wall, the wall pushes back on you with a(n) weaker force.
- Answer: False
Corrected word: *equal*
Explanation: According to Newton’s Third Law, the wall pushes back with an equal and opposite force. The force is not weaker; it’s exactly equal in magnitude.
✔ Corrected statement: "...with an equal force."
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Fill in the Blank
7. Newton’s second law of motion states that an object’s acceleration depends on its ____________ and on the net force acting on it.
- Answer: mass
Explanation: Acceleration is inversely proportional to mass: $ a = \frac{F}{m} $. So, the greater the mass, the less the acceleration for the same force.
✔ Answer: mass
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8. Acceleration is measured in ____________.
- Answer: meters per second squared (m/s²)
Explanation: Acceleration is the rate of change of velocity over time: $ \text{m/s} ÷ \text{s} = \text{m/s²} $
✔ Answer: m/s²
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9. Force is measured in a unit called the ____________.
- Answer: newton (N)
Explanation: One newton is defined as the force required to accelerate a 1 kg mass at 1 m/s²: $ 1\, \text{N} = 1\, \text{kg·m/s²} $
✔ Answer: newton
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10. The smaller the mass of an object, the ____________ its inertia.
- Answer: less
Explanation: Inertia is directly related to mass. Less mass → less resistance to changes in motion → less inertia.
✔ Answer: less
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11. Newton’s second law of motion describes the relationship among force, mass, and acceleration. Write the equation.
- Answer: $ F = ma $
Explanation: This is the standard form of Newton’s Second Law: Net force equals mass times acceleration.
✔ Answer: $ \boxed{F = ma} $
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12. How does the diagram at the right illustrate Newton’s third law of motion?
*(Diagram shows a foot kicking a soccer ball)*
- Answer: When the foot kicks the soccer ball, the foot exerts a force on the ball, and the ball exerts an equal and opposite force on the foot. This is an example of Newton’s Third Law: for every action, there is an equal and opposite reaction. The forces are equal in magnitude but act on different objects (the ball and the foot).
✔ Sample Answer:
The diagram illustrates Newton’s third law because when the foot applies a force to the soccer ball, the ball applies an equal and opposite force back on the foot. These two forces are action-reaction pairs.
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✔ Final Answers Summary:
1. False → unbalanced
2. True
3. False → opposite
4. False → inertia
5. False → do not
6. False → equal
7. mass
8. m/s²
9. newton
10. less
11. $ F = ma $
12. The foot exerts a force on the ball, and the ball exerts an equal and opposite force on the foot — demonstrating action-reaction pairs.
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Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of newton first law worksheet.
