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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 car moving down a road.
- A book resting on a table.
- An apple falling from a tree. (correct)
- A hand pushing a cart.
A box is at rest on a ramp. What type of friction is primarily responsible for preventing the box from sliding down?
A box is at rest on a ramp. What type of friction is primarily responsible for preventing the box from sliding down?
- Static friction (correct)
- Sliding friction
- Fluid friction
- Rolling friction
How does increasing the distance between two objects affect the gravitational force between them?
How does increasing the distance between two objects affect the gravitational force between them?
- Decreases the gravitational force. (correct)
- Does not affect the gravitational force.
- Increases the gravitational force.
- Doubles the gravitational force.
An astronaut has a mass of 60 kg on Earth. What happens to their mass when they travel to the Moon?
An astronaut has a mass of 60 kg on Earth. What happens to their mass when they travel to the Moon?
A 10 kg object is sliding across a floor with an applied force of 50N. If the friction force is 10N, what is the net force acting on the object?
A 10 kg object is sliding across a floor with an applied force of 50N. If the friction force is 10N, what is the net force acting on the object?
Which of the following is an example of fluid friction?
Which of the following is an example of fluid friction?
If object A has twice the mass of object B, how does the gravitational force of object A on object B compare to the gravitational force of object B on object A?
If object A has twice the mass of object B, how does the gravitational force of object A on object B compare to the gravitational force of object B on object A?
What distinguishes weight from mass?
What distinguishes weight from mass?
Consider a scenario where a heavy box is pushed across a rough floor. Initially, a large force is required to start the box moving. Once it is moving, less force is needed to keep it moving. This is because:
Consider a scenario where a heavy box is pushed across a rough floor. Initially, a large force is required to start the box moving. Once it is moving, less force is needed to keep it moving. This is because:
A feather and a bowling ball are dropped simultaneously in a vacuum. Which of the following statements is correct?
A feather and a bowling ball are dropped simultaneously in a vacuum. Which of the following statements is correct?
Flashcards
Force
Force
A push or pull on an object, measured in newtons (N).
Contact Force
Contact Force
A force requiring direct contact between objects.
Non-Contact Force
Non-Contact Force
A force that acts between objects without direct contact.
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 are two broad categories
- The law of universal gravitation describes gravity
- Friction impacts the motion of two objects sliding past each other
Types of Forces
- Force is a push or a pull on an object
- Forces are measured in newtons (N)
Contact Force
- A contact force is a push or pull on one object by another that is touching
- Examples include pushing a container, pressing on computer keys, and friction
Non-Contact Force
- A non-contact force is a push or pull on one object by another without touching
- Examples include gravity, magnetic force, and electrical force
Types of Friction
- Friction is a force that resists the motion of two objects that are touching
Static Friction
- Static friction prevents objects from sliding past each other
Sliding Friction
- Sliding friction opposes the motion of objects sliding past each other
Fluid Friction
- Fluid friction is the friction between a surface and a fluid such as water or air (air resistance)
Static Friction vs Sliding Friction
- Static friction: Static friction -100N, Applied force 100N, Net Force = 0N
- Sliding friction: Sliding friction -70N, Applied force 200N, Net Force = 130N
Gravity
- Gravity is an attractive force that exists between all objects that have mass
- Mass is the amount of matter in an object
- The more the mass, the more the gravitational pull
Distance
- The greater the distance, the less gravitational pull
Weight vs Mass
- Weight is the amount of gravitational force exerted on an object and measured in newtons (N)
- If an astronaut weighs 539N and has a mass of 55kg on Earth, her weight would be less on the moon
Electrical Force
- Static Charge: unbound positive or negative charge on an object
- Opposite charges attract each other
- The same charges repel each other
Variables that affect electric charge
- The more the charge, the greater the electrical force (attraction or repulsion)
- The more distance, the less electrical charge
Magnetic Force
- Magnet: object that attracts metal iron
- Magnetic Pole: 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
Variables that affect magnetic strength
- Size of magnet
- Distance: the further away the magnets, the weaker the magnetic force
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Description
Explore types of forces, including contact and non-contact forces. Understand gravity, friction, static friction, and sliding friction and how they impact the motion of objects. Forces are measured in newtons (N).
