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Questions and Answers
A box is resting on a ramp. Which of the following statements best describes the relationship between static friction and the applied force acting on the box?
A box is resting on a ramp. Which of the following statements best describes the relationship between static friction and the applied force acting on the box?
- Static friction decreases as the applied force increases.
- Static friction is constant, regardless of the applied force.
- Static friction increases as the applied force increases, up to a maximum value. (correct)
- Static friction is always greater than the applied force.
Consider a scenario where a wooden block is sliding across a concrete floor. If the surface area of the block in contact with the floor is doubled, how will the sliding friction acting on the block be affected, assuming the weight of the block remains constant?
Consider a scenario where a wooden block is sliding across a concrete floor. If the surface area of the block in contact with the floor is doubled, how will the sliding friction acting on the block be affected, assuming the weight of the block remains constant?
- The sliding friction will be halved.
- The sliding friction will increase by a factor of four.
- The sliding friction will double.
- The sliding friction will remain the same. (correct)
A car is traveling at a constant speed on a straight, level road. Which of the following statements accurately 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 accurately describes the forces acting on the car?
- The forward force from the engine is equal to the sum of the forces of friction and air resistance. (correct)
- The force of gravity is the only force acting on the car.
- There are no forces acting on the car because it is moving at a constant speed.
- The forward force from the engine is greater than the force of friction and air resistance.
An astronaut is on the Moon, which has less gravitational pull than Earth. Which of the following statements is true regarding the astronaut's mass and weight compared to when they are on Earth?
An astronaut is on the Moon, which has less gravitational pull than Earth. Which of the following statements is true regarding the astronaut's mass and weight compared to when they are on Earth?
Two objects with masses m1 and m2 are separated by a distance r. According to the law of universal gravitation, if the distance between them is doubled, the gravitational force between them will:
Two objects with masses m1 and m2 are separated by a distance r. According to the law of universal gravitation, if the distance between them is doubled, the gravitational force between them will:
A feather and a bowling ball are dropped simultaneously in a vacuum (no air resistance). Which of the following statements is true?
A feather and a bowling ball are dropped simultaneously in a vacuum (no air resistance). Which of the following statements is true?
Which of the following is an example of a non-contact force?
Which of the following is an example of a non-contact force?
A student is pushing a heavy crate across a floor. They find that it takes more force to get the crate moving than to keep it moving at a constant velocity. This is because:
A student is pushing a heavy crate across a floor. They find that it takes more force to get the crate moving than to keep it moving at a constant velocity. This is because:
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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Study Notes
- Forces can change the motion of an object
Gravity and Friction
- Essential questions:
- What are some contact forces and some non-contact forces?
- What is the law of universal gravitation?
- How does friction affect the motion of two objects sliding past each other?
Types of Forces
- Force: A push or a pull on an object; forces are measured in newtons (N)
- Two Types of Forces: contact and non-contact
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, Electrical
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 (known as air resistance)
Gravity
- Gravity is an attractive force that exists between all objects that have mass
- Mass: amount of matter is an object
- The more the mass the more gravitational pull
- The greater the distance the less gravitational pull
Weight
- Weight:
- If an astronaut weighs 539N and has a mass of 55 kg on Earth, what variable would change if she was on the moon? (F=ma)
- Her weight would be less on the moon, and her mass would not change
Electrical Force
- Static Charge: unbalanced positive or negative charge on an object
- Opposite charges attract each other
- The same charge repels each other
- Variables that affect electric charge:
- Amount of charge; the more charge, the greater the electrical force attraction or repulsion
- Distance: the more distance the less electron force
Magnetic Force
- Magnet: Object that attracts metal iron
- Magnetic Pole: place on a magnet where the force it applies is the strongest
- Opposite poles attract each other
- The same poles repel each other
- Variables that affect magnetic strength:
- Size of magnet
- Distance: the further away the magnets are the weaker the magnetic force
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Description
Understand the effect of forces on motion, differentiating between contact and non-contact forces such as gravity and friction. Explore the law of universal gravitation and different types of friction including static, sliding and fluid friction. Learn how these forces affect the interaction between objects.
