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Questions and Answers
A book rests on a table. Which force opposes the gravitational force acting on the book?
A book rests on a table. Which force opposes the gravitational force acting on the book?
- Sliding friction between the book and the table.
- Fluid friction from the air surrounding the book.
- The normal force exerted by the table on the book. (correct)
- Static friction preventing the book from sliding off the table.
Two objects with different masses are dropped simultaneously from the same height in a vacuum. What can be said about their acceleration?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. What can be said about their acceleration?
- The object with greater mass experiences greater acceleration.
- The object with less mass experiences greater acceleration.
- The acceleration depends on the shape and size of the objects.
- Both objects experience the same acceleration due to gravity. (correct)
How would increasing the distance between two objects affect the gravitational force between them?
How would increasing the distance between two objects affect the gravitational force between them?
- The gravitational force would decrease linearly.
- The gravitational force would increase linearly.
- The gravitational force would increase exponentially.
- The gravitational force would decrease. (correct)
A box is being pushed across a rough floor. What type of friction primarily opposes its motion?
A box is being pushed across a rough floor. What type of friction primarily opposes its motion?
A car is travelling at a constant velocity on a straight, level road. Which of the following statements must be true regarding the forces acting on the car?
A car is travelling at a constant velocity on a straight, level road. Which of the following statements must be true regarding the forces acting on the car?
A skydiver is falling through the air before opening their parachute. Which type of friction is primarily acting upon them?
A skydiver is falling through the air before opening their parachute. Which type of friction is primarily acting upon them?
An astronaut has a mass of 70 kg on Earth. What will their mass be on the Moon?
An astronaut has a mass of 70 kg on Earth. What will their mass be on the Moon?
Which of the following situations involves static friction?
Which of the following situations involves static friction?
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 direct contact.
Friction
Friction
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Static Friction
Static Friction
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Sliding Friction
Sliding Friction
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Gravity
Gravity
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Weight
Weight
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Study Notes
- Forces can change the motion of an object
Gravity & Friction
- Essential questions include contact and non-contact forces, the law of universal gravitation, and how friction affects the motion of sliding objects
Types of Forces
- Force: A push or a pull on an object
- Forces are measured in newtons (N)
Contact Force
- A push or pull on one object by another that is touching it
- Examples: pushing a container, pressing on computer keys, friction
Non-Contact Force
- A push or a pull on one object by another without touching it
- Examples: gravity, magnetic force
Types of Friction
- Friction: 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
- Friction between a surface and a fluid such as water or air (air resistance).
Static Friction vs. Sliding Friction
- Net force = 0N in static friction because the object is not moving
- Net force is not 0N in sliding friction because the object is moving
Gravity, Mass and Distance
- Gravity: An attractive force that exists between all objects that have mass
- Mass: Amount of matter in an object
- The more the mass, the more the gravitational pull
- The greater the distance, the less gravitational pull
Weight vs. Mass
- Weight: The amount of gravitational force exerted on an object: Weight is measured in Newtons
- If an astronaut weighs 539N and has a mass of 55kg on Earth, on the moon their weight would be less
Electrical Force
- Static Charge: An unbalance of positive or negative charge on an object
- Opposite charges attract each other
- Like charges repel each other
Variables that Affect Electric Charge
- Amount of charge influences electrical force: The more charge, the greater the electrical force
- Distance influences electrical force: The more distance, the less electrical force
Magnetic Force
- Magnet: An object that attracts metal iron
- Magnetic Pole: The place on a magnet where the force applied is the strongest
- Opposite poles attract each other
- The same poles repel each other
Variables that Affect Magnetic Strength
- Size of magnet is a factor
- Distance the magnets are apart: The further away the magnets, the weaker the magnetic force
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Description
Explore forces and motion, including contact and non-contact forces like gravity and friction. Learn about static, sliding, and fluid friction, and how they affect an object's motion. Understand the difference between static and sliding friction.