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Questions and Answers
What is the force on an object that goes from 35 m/s to 85 m/s in 20 seconds and has a mass of 148 kg?
What is the force on an object that goes from 35 m/s to 85 m/s in 20 seconds and has a mass of 148 kg?
370 N
Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s².
Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s².
48 N
What is the sprinter's average acceleration during a race when he increases from 5.0 m/s to 7.5 m/s over a period of 1.25 s?
What is the sprinter's average acceleration during a race when he increases from 5.0 m/s to 7.5 m/s over a period of 1.25 s?
2 m/s²
A motorcycle has a mass of 250 kg and a velocity of 68 m/s. What is its momentum?
A motorcycle has a mass of 250 kg and a velocity of 68 m/s. What is its momentum?
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What is the acceleration of an object with a mass of 200 kg that is acted upon by a force of 3,000 N?
What is the acceleration of an object with a mass of 200 kg that is acted upon by a force of 3,000 N?
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What is the distance and displacement of a truck that travels to and from a stone quarry located 2.5 km east?
What is the distance and displacement of a truck that travels to and from a stone quarry located 2.5 km east?
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What is the average speed of a cross-country runner who runs 10 km in 40 minutes?
What is the average speed of a cross-country runner who runs 10 km in 40 minutes?
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What was the acceleration of a runner who went from 6 m/s to 2 m/s in 2 seconds?
What was the acceleration of a runner who went from 6 m/s to 2 m/s in 2 seconds?
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What is the velocity of a dog that travels 250 meters east in 8 seconds?
What is the velocity of a dog that travels 250 meters east in 8 seconds?
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What is the current momentum of a large truck loaded with scrap steel weighing 14 metric tons and traveling at an average speed of 48 km/h?
What is the current momentum of a large truck loaded with scrap steel weighing 14 metric tons and traveling at an average speed of 48 km/h?
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What was the speed of James who rode his bike for 0.65 hours and traveled 8.45 km?
What was the speed of James who rode his bike for 0.65 hours and traveled 8.45 km?
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What is the momentum of a 10-kg wagon moving at a speed of 25 m/s?
What is the momentum of a 10-kg wagon moving at a speed of 25 m/s?
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What is the total distance and displacement of a dog that travels north for 18 meters, east for 8 meters, south for 27 meters, and west for 8 meters?
What is the total distance and displacement of a dog that travels north for 18 meters, east for 8 meters, south for 27 meters, and west for 8 meters?
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How far did Brittany travel if she drove at a speed of 85 km/h south for 4 hours?
How far did Brittany travel if she drove at a speed of 85 km/h south for 4 hours?
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What is the mass of an object that has a force of 89 N and an acceleration of 25 m/s²?
What is the mass of an object that has a force of 89 N and an acceleration of 25 m/s²?
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What is the force acting on an object with a mass of 2,489 kg and an acceleration of 6.25 m/s²?
What is the force acting on an object with a mass of 2,489 kg and an acceleration of 6.25 m/s²?
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What distance did the driver of a pickup truck travel at a velocity of 75.0 km/h for 33 minutes?
What distance did the driver of a pickup truck travel at a velocity of 75.0 km/h for 33 minutes?
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How far does a high-speed train travel with an average speed of 227 km/h for 2 hours?
How far does a high-speed train travel with an average speed of 227 km/h for 2 hours?
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What is the acceleration of a 300-N force acting on a 25-kg object?
What is the acceleration of a 300-N force acting on a 25-kg object?
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What is the momentum of a 10.0 kg dog chasing a rabbit north at 6.0 m/s?
What is the momentum of a 10.0 kg dog chasing a rabbit north at 6.0 m/s?
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What is Newton's first law of motion also called?
What is Newton's first law of motion also called?
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The statement 'to every action, there is an equal and opposite reaction' is attributed to which law?
The statement 'to every action, there is an equal and opposite reaction' is attributed to which law?
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What law states that the unbalanced force acting on an object equals the object's mass times its acceleration?
What law states that the unbalanced force acting on an object equals the object's mass times its acceleration?
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Which of the following best illustrates balanced forces?
Which of the following best illustrates balanced forces?
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__ forces acting on an object cause the object to accelerate.
__ forces acting on an object cause the object to accelerate.
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If Sally sits on a rock, her weight is an action force. Describe its reaction force.
If Sally sits on a rock, her weight is an action force. Describe its reaction force.
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Friction is a force that ______ motion between two surfaces that are touching each other.
Friction is a force that ______ motion between two surfaces that are touching each other.
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At the same speed, why is a bowling ball harder to stop than a soccer ball?
At the same speed, why is a bowling ball harder to stop than a soccer ball?
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Why is your weight less on the Moon than on Earth, but your mass is the same?
Why is your weight less on the Moon than on Earth, but your mass is the same?
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The size of the gravitational force between two objects depends on their ____ and ____.
The size of the gravitational force between two objects depends on their ____ and ____.
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What law states that every object maintains constant velocity unless acted on by an unbalanced force?
What law states that every object maintains constant velocity unless acted on by an unbalanced force?
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A tug-of-war that results in one team pulling the other across the line is an example of ___ forces.
A tug-of-war that results in one team pulling the other across the line is an example of ___ forces.
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An object in motion at a constant velocity will change its motion only if a(n) ____ force acts on it.
An object in motion at a constant velocity will change its motion only if a(n) ____ force acts on it.
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What law states that for every action force there is an equal and opposite reaction force?
What law states that for every action force there is an equal and opposite reaction force?
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The _____ velocity is the highest velocity that will be reached by a falling object.
The _____ velocity is the highest velocity that will be reached by a falling object.
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In a car crash, ____ could cause you to crash into the windshield.
In a car crash, ____ could cause you to crash into the windshield.
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Of the following, the greatest gravitational force would occur between:
Of the following, the greatest gravitational force would occur between:
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When the forces acting on an object are ____, the net force is zero.
When the forces acting on an object are ____, the net force is zero.
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When objects are moved further apart from each other, what happens to the force of gravity?
When objects are moved further apart from each other, what happens to the force of gravity?
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According to Newton's second law of motion, what does a larger force acting on an object cause?
According to Newton's second law of motion, what does a larger force acting on an object cause?
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Study Notes
Motion and Forces Essentials
- Force calculation includes mass and acceleration; example: 370 N is calculated for an object transitioning from 35 m/s to 85 m/s.
- To find force: multiply mass by acceleration; for a 12 kg object with 4 m/s² results in 48 N.
- Average acceleration of a sprinter moving from 5.0 m/s to 7.5 m/s in 1.25 seconds is 2 m/s².
- Momentum is the product of mass and velocity; a motorcycle with a mass of 250 kg moving at 68 m/s has a momentum of 17,000 kg·m/s.
- The acceleration of a 200-kg object acted upon by a 3,000 N force is calculated at 15 m/s².
Distance and Displacement
- Total distance traveled is the sum of all path lengths, as shown in a truck traveling to and from a quarry: 5 km distance, 0 km displacement.
- Average speed for a runner completing 10 km in 40 minutes is 0.25 km/min.
- A dog traveling 250 meters in 8 seconds has a velocity of 31.25 m/s.
- A truck loaded with scrap weighs 14 metric tons and had zero momentum after stopping to refuel.
Motion Calculations
- A cyclist traveling 8.45 km in 0.65 hours achieves a speed of 13 km/h.
- The momentum of a 10 kg wagon moving at 25 m/s is 250 kg·m/s.
- A dog’s travel resulting in 61 m distance and 9 m displacement after changing directions showcases the difference between the two concepts.
Newton's Laws of Motion
- Newton's first law, or the Law of Inertia, asserts that an object remains in its state of motion unless acted upon by an unbalanced force.
- The force exerting an action has an equal and opposite action; this is the essence of Newton's third law.
- Unbalanced forces cause acceleration; a tug-of-war where one team wins is an example.
- Balanced forces result in a net force of zero, keeping an object in motion.
Gravitational Force and Acceleration
- Mass and distance between two objects dictate the gravitational force; larger distances result in decreased gravitational force.
- A bowling ball is harder to stop than a soccer ball due to its greater mass at the same speed.
- The concept of terminal velocity describes the maximum speed a falling object can achieve, stabilizing due to equal force of gravity and air resistance.
Everyday Applications
- Inertia explains why passengers may crash into windshields during sudden stops.
- Weight differs on the Moon compared to Earth due to variations in gravitational pull, while mass remains constant.
- A common misconception is the relation of gravitational forces between various objects; the moon and Earth have the greatest gravitational attraction compared to smaller objects.
Fundamental Concepts
- Friction acts against motion, resisting sliding between surfaces in contact.
- The greater the force, the greater the acceleration an object will experience, indicating a direct relationship according to Newton's second law.
- Continuous motion at constant velocity will only change when influenced by an unbalanced force, confirming the inertia principle in everyday occurrences.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of motion and forces with these flashcards. Each card presents a scenario requiring you to calculate force and acceleration based on given parameters. Perfect for physics students looking to reinforce their understanding of these concepts.
