Podcast
Questions and Answers
Which of the following scenarios best demonstrates a non-contact force?
Which of the following scenarios best demonstrates a non-contact force?
- A hockey player striking a puck with a stick.
- An apple falling from a tree due to Earth's gravity. (correct)
- A carpenter hammering a nail into a piece of wood.
- A student pushing a book across a table.
A box is resting on a ramp. What type of friction is primarily responsible for preventing the box from sliding down the ramp?
A box is resting on a ramp. What type of friction is primarily responsible for preventing the box from sliding down the ramp?
- Rolling friction
- Fluid friction
- Sliding friction
- Static friction (correct)
Considering the relationship between mass, distance, and gravitational force, what would happen to the gravitational force between two objects if the mass of one object doubles and the distance between them also doubles?
Considering the relationship between mass, distance, and gravitational force, what would happen to the gravitational force between two objects if the mass of one object doubles and the distance between them also doubles?
- It would be twice as great.
- It would be half as great. (correct)
- It would be four times greater.
- It would remain the same.
An astronaut has a weight of 882 N on Earth. If the gravitational force on the Moon is approximately 1/6th of Earth's, what would be the astronaut's approximate weight on the Moon?
An astronaut has a weight of 882 N on Earth. If the gravitational force on the Moon is approximately 1/6th of Earth's, what would be the astronaut's approximate weight on the Moon?
A car is traveling at a constant speed on a straight, level road. Which of the following statements best describes the forces acting on the car?
A car is traveling at a constant speed on a straight, level road. Which of the following statements best describes the forces acting on the car?
Which of the following is an example of fluid friction significantly affecting motion?
Which of the following is an example of fluid friction significantly affecting motion?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. What will happen?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. What will happen?
A student is trying to move a heavy cabinet across a carpeted floor. They apply a force but the cabinet does not move. What type of friction is opposing their applied force?
A student is trying to move a heavy cabinet across a carpeted floor. They apply a force but the cabinet does not move. What type of friction is opposing their applied force?
If the distance between two magnets is tripled, how does the magnetic force between them change, assuming the poles remain the same?
If the distance between two magnets is tripled, how does the magnetic force between them change, assuming the poles remain the same?
An electric motor uses the interaction between electric and magnetic forces to function. Which of the following best describes this interaction?
An electric motor uses the interaction between electric and magnetic forces to function. Which of the following best describes this interaction?
Flashcards
Force
Force
A push or pull on an object, measured in newtons (N).
Contact Force
Contact Force
A force that requires direct contact between objects.
Non-contact Force
Non-contact Force
A force that acts between objects without them physically touching.
Friction
Friction
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Static Friction
Static Friction
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Sliding Friction
Sliding Friction
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Fluid Friction
Fluid Friction
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Gravity
Gravity
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Mass
Mass
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Weight
Weight
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Study Notes
Forces Overview
- Forces may change the motion of an object
- Chapter 2 discusses Gravity & Friction
- Chapter 19 discusses Electric Forces
- Chapter 20 dicusses Magnetic Forces
Contact Forces
- A force is a push or pull on an object and is measured in newtons (N)
- Contact force involves an object pushing or pulling on another object by touching it
- Pushing a container, pressing on computer keys, and friction are examples of contact forces
Non-Contact Forces
- Non-contact force involves an object pushing or pulling on another object without touching it
- Gravity, magnetic, and electrical forces are examples of non-contact forces
Friction
- Friction resists the motion of two objects that are touching
Types of Friction
- Static friction prevents objects from sliding past each other
- Sliding friction opposes the motion of objects sliding past each other
- Fluid friction exists between a surface and a fluid such as water or air (air resistance)
- In static friction an applied force of 100N results in static friction of -100N for a net force of 0N
- With sliding friction an applied force of 200N results in sliding friction of -70N for a net force of 130N
Gravity
- Gravity is an attractive force that exists between all objects with mass
- Mass is the amount of matter in an object
- Mass affects gravity, the more mass, the more gravitational pull
- Distance effects gravity, the greater the distance, the less gravitational pull
Weight vs Mass
- Weight is the amount of gravitational force exerted on an object and is measured in newtons (N)
- If an astronaut weighs 539N and has a mass of 55kg on Earth, their weight would be less on the moon
Non-contact Electrical Force
- Static charge is unbalanced positive or negative charge on an object
- Opposite charges attract each other
- The same charges repel each other
- The amount of charge affects electric charge: The more charge the greater the electrical force (attraction or repulsion)
- Distance affects electric charge, the more distance the less electrical force
Non-contact Magnetic Force
- A magnet is an object that attracts metal iron
- A magnetic pole is a place on a magnet where the force it applies is the strongest
- Opposite poles (charges) attract each other
- The same poles (charges) repel each other
- The size of a magnet affects magnetic strength
- Distance affects magnetic strength: the further away the magnets are the weaker the magnetic force
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