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 student pushing a heavy box across the floor.
- A carpenter hammering a nail into a piece of wood.
- The friction between a bicycle's tires and the road.
- An apple falling from a tree due to gravitational attraction. (correct)
A book rests on a table. Which force prevents the book from moving downwards?
A book rests on a table. Which force prevents the book from moving downwards?
- Static friction (correct)
- Applied Force
- Sliding friction
- Gravity
How would reducing the distance between two objects impact the gravitational force between them?
How would reducing the distance between two objects impact the gravitational force between them?
- The gravitational force would remain the same.
- The gravitational force would decrease proportionally to the decrease in distance.
- The gravitational force would increase. (correct)
- The gravitational force would decrease.
A car is moving at a constant velocity. Suddenly, the driver applies the brakes. What type of friction primarily opposes the car's motion?
A car is moving at a constant velocity. Suddenly, the driver applies the brakes. What type of friction primarily opposes the car's motion?
If an astronaut's mass is 60 kg on Earth, what will their mass be on the Moon?
If an astronaut's mass is 60 kg on Earth, what will their mass be on the Moon?
You are pushing a box across a floor. You increase your pushing force, but the box's acceleration doesn't increase proportionally. What is the most likely cause?
You are pushing a box across a floor. You increase your pushing force, but the box's acceleration doesn't increase proportionally. What is the most likely cause?
Which of the following best explains why a feather falls slower than a rock in Earth's atmosphere?
Which of the following best explains why a feather falls slower than a rock in Earth's atmosphere?
Two identical boxes are placed on different surfaces: one on smooth ice and the other on rough asphalt. If the same force is applied to each box, which box will accelerate more, and why?
Two identical boxes are placed on different surfaces: one on smooth ice and the other on rough asphalt. If the same force is applied to each box, which box will accelerate more, and why?
A spacecraft is traveling through deep space, far from any significant gravitational sources. What force is primarily acting upon it?
A spacecraft is traveling through deep space, far from any significant gravitational sources. What force is primarily acting upon it?
A student is trying to move a heavy crate across a floor. They initially apply a small force, but the crate doesn't move. They gradually increase the force until the crate suddenly starts sliding. What explains this?
A student is trying to move a heavy crate across a floor. They initially apply a small force, but the crate doesn't move. They gradually increase the force until the crate suddenly starts sliding. What explains this?
Flashcards
Force
Force
A push or pull on an object, measured in newtons (N).
Contact Force
Contact Force
A force when objects touch. Examples: pushing a box, friction.
Noncontact Force
Noncontact Force
A force that acts without direct contact. Examples: gravity, magnetic force, electric force.
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 can change the motion of an object.
Gravity and Friction
- Contact forces and non-contact forces exist.
- There is a law of universal gravitation.
- Friction affects the motion of two objects sliding past each other.
Types of Forces
- Force is a push or pull on an object measured in newtons (N).
Contact Force
- A push or pull on one object by another that is touching it.
- Examples are pushing a container, friction, and pressing on computer keys.
Noncontact Force
- A force that one object can apply to another object without touching it such as gravity, magnetic, and electrical forces.
Types of Friction
- Friction is a force that resists the motion of two objects that are touching.
- Static friction prevents objects from sliding past each other.
- Sliding friction opposes the motion of objects sliding past each other.
- Fluid friction occurs between a surface and a fluid like water or air (air resistance).
- When static friction is applied the net Force is 0N.
- When sliding friction is applied the net Force is 130N.
Gravity
- Gravity is an attractive force that exists between all objects that have mass.
- Mass is defined as the amount of matter in an object.
- The more mass, the more gravitational pull.
- The change in distance will result in less gravitational pull.
Weight vs Mass
- Weight is the amount of gravitational force exerted on an object.
- Weight is measured in newtons (N)
- For an astronaut weighing 539N with a mass of 55 kg on Earth, their weight would change on the moon, but their mass would remain the same assuming they neither gained nor lost any body mass.
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 determines the electrical force of attraction or repulsion.
- The distance determines the electrical force.
Magnetic Force
- A magnet is an object that attracts metal iron
- A magnetic pole is a location on a magnet where the force is the strongest
- Opposite poles (charges) attract each other.
- The same poles (charges) repel each other.
- Magnetic strength is impacted by the size of magnet.
- Magnetic strength is impacted by the distance between magnets.
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