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Questions and Answers
A book rests on a table. Which of the following forces is not acting on the book?
A book rests on a table. Which of the following forces is not acting on the book?
- Static friction, preventing the book from sliding.
- Fluid friction, due to the surrounding air. (correct)
- A normal force, exerted by the table upwards.
- Gravity, pulling the book downwards.
Two boxes with different masses are pushed across a floor with the same applied force. Which box will experience greater acceleration if friction is the same for both?
Two boxes with different masses are pushed across a floor with the same applied force. Which box will experience greater acceleration if friction is the same for both?
- Both boxes will have the same acceleration.
- Acceleration depends on the color of the box.
- The box with the greater mass.
- The box with the smaller mass. (correct)
An astronaut is holding a wrench in space. Which statement accurately describes the forces acting on the wrench?
An astronaut is holding a wrench in space. Which statement accurately describes the forces acting on the wrench?
- Gravity from distant objects still acts on the wrench, but its effect might be small. (correct)
- There are no forces acting on the wrench because it is in space.
- The wrench experiences significant air resistance due to the lack of atmosphere.
- The only force acting on the wrench is the astronaut's grip.
A car is traveling at a constant velocity on a straight, level road. What can you infer about the forces acting on the car?
A car is traveling at a constant velocity on a straight, level road. What can you infer about the forces acting on the car?
A hockey puck slides across an ice rink, gradually slowing down. Which type of friction is primarily responsible for this deceleration?
A hockey puck slides across an ice rink, gradually slowing down. Which type of friction is primarily responsible for this deceleration?
An object's weight on Earth is 98 N. If the gravitational acceleration on the Moon is approximately 1/6th of Earth's, what would be the object's approximate weight on the Moon?
An object's weight on Earth is 98 N. If the gravitational acceleration on the Moon is approximately 1/6th of Earth's, what would be the object's approximate weight on the Moon?
Why is it more difficult to start moving a heavy box than to keep it moving once it's already sliding?
Why is it more difficult to start moving a heavy box than to keep it moving once it's already sliding?
Which of the following scenarios involves a non-contact force?
Which of the following scenarios involves a non-contact force?
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
- 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
- A force is either a push or pull on an object.
- Forces are measured in newtons (N).
Contact force
- A push or a pull on one object by another that is touching it.
- Pushing containers, pressing computer keys and friction are examples of contact force.
Non-Contact Force
- A push or pull on one object by another without touching it.
- Gravity, magnetic and electrical forces are examples of non-contact force.
Types of Friction
- Friction 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 occurs between a surface and a fluid like water, or air resistance.
Static Friction vs. Sliding Friction
- Net Force equals 0N in static friction
Gravity
- An attractive force that exists between objects, all objects that have mass.
- Mass represents the amount of matter in an object.
- The more the mass, the more gravitational pull.
- The greater the distance, the less gravitational pull.
Weight
- If an astronaut weighs 539N and has a mass of 55kg on Earth, the weight will change on the moon.
Static Charge
- Static Charge represents unbalanced positive or negative charge on an object.
- Opposite charges attract each other.
- The same charges repel each other.
Variables Affecting Electric Charge
- The more charge exists, the greater the electrical force (attraction or repulsion).
- The more distance, the less electrical force.
Magnetism
- Magnets attract metal iron.
Magnetic pole
- The magnetic pole is the place on a magnet where the applied force is the strongest.
- Opposite poles (charges) attract each other.
- The same poles (charges) repel each other.
Variables Affecting Magnetic Strength
- The size of the magnet affects strength .
- The further away magnets are, the weaker the magnetic force.
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Description
Explore how forces alter object motion, differentiating between contact and non-contact forces. Learn about universal gravitation and the effects of friction on sliding objects. Discover various types of friction, including static, sliding, and fluid friction.
