Podcast
Questions and Answers
Which of the following scenarios best exemplifies a non-contact force?
Which of the following scenarios best exemplifies a non-contact force?
- An apple falling from a tree. (correct)
- A person pushing a box across the floor.
- A car colliding with a stationary object.
- A hockey stick hitting a puck.
A book rests on a table. Which of the following forces is primarily responsible for preventing the book from falling through the table?
A book rests on a table. Which of the following forces is primarily responsible for preventing the book from falling through the table?
- Static friction
- Normal force (correct)
- Gravitational force
- Sliding friction
An object is at rest on an inclined plane. What type of friction is primarily responsible for preventing the object from sliding down the plane?
An object is at rest on an inclined plane. What type of friction is primarily responsible for preventing the object from sliding down the plane?
- Static friction (correct)
- Sliding friction
- Fluid friction
- Kinetic friction
Which of the following changes would result in the GREATEST increase in the gravitational force between two objects?
Which of the following changes would result in the GREATEST increase in the gravitational force between two objects?
A 5kg box is pushed with a force of 20N across a horizontal surface. The force of friction is 10N. What is the net force acting on the box?
A 5kg box is pushed with a force of 20N across a horizontal surface. The force of friction is 10N. What is the net force acting on the box?
A car is traveling 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 traveling at a constant velocity on a straight, level road. Which of the following statements MUST be true regarding the forces acting on the car?
If an astronaut weighs 539N on Earth, what would change if they were on the moon?
If an astronaut weighs 539N on Earth, what would change if they were on the moon?
Which of the following situations involves fluid friction as the primary resistive force?
Which of the following situations involves fluid friction as the primary resistive force?
Two objects, one with a mass of 2kg and the other with a mass of 4kg, are separated by a certain distance. How does the gravitational force exerted by the larger mass on the smaller mass compare to the gravitational force exerted by the smaller mass on the larger mass?
Two objects, one with a mass of 2kg and the other with a mass of 4kg, are separated by a certain distance. How does the gravitational force exerted by the larger mass on the smaller mass compare to the gravitational force exerted by the smaller mass on the larger mass?
A car is parked on a hill. Which of the following statements accurately describes the static friction acting on the car?
A car is parked on a hill. Which of the following statements accurately describes the static friction acting on the car?
Flashcards
Force
Force
A push or pull on an object.
Contact Force
Contact Force
A force requiring direct contact between objects.
Non-Contact Force
Non-Contact Force
A force that acts without direct contact.
Friction
Friction
Signup and view all the flashcards
Static Friction
Static Friction
Signup and view all the flashcards
Sliding Friction
Sliding Friction
Signup and view all the flashcards
Fluid Friction
Fluid Friction
Signup and view all the flashcards
Gravity
Gravity
Signup and view all the flashcards
Mass
Mass
Signup and view all the flashcards
Weight
Weight
Signup and view all the flashcards
Study Notes
- Forces can change the motion of an object
Gravity and friction
- Contact forces vs. Non-contact forces
- Examines the law of universal gravitation
- Friction affects the motion of two objects sliding past each other
Types of forces:
- A force constitutes a push or pull on an object
- Two types of forces: contact and non-contact
Contact Force
- A push or pull on one object by another that is touching it
Non-Contact force
- A push or pull on one object by another without touching it
- Examples of non-contact force: gravity, magnetic, and electrical forces
Friction
- Friction resists the motion of two objects that are touching
Types of Friction
- Static Friction: Prevents objects from sliding past each other
- Sliding Friction: Opposes the motion of objects sliding past each other
- Fluid Friction: Operates between a surface and a fluid like water or air (air resistance)
Static Friction
- Is equal to the applied force up until the point movement begins
- Net force in equal in magnitude, but opposite in direction in relation to the object
Sliding Friction
- Is the force that opposes the start of motion
- Net force is equal in magnitude, but opposite in direction in relation to the object
Gravity
- Gravity represents an attractive force existing between all matter
- Mass is the amount of matter in an object
- The more mass, the greater the gravitational pull
Gravity vs distance
- The greater the distance, the less gravitational pull
- Weight amount of gravitational force
- Mass is the amount of matter in an object
Non-contact Force: Electrical
- Static Charge: Is an unbalanced positive or negative charge on an object
- Opposite charges attract each other
- The same charges repel each other
Variables Affecting Electric Charge:
- The greater the charge, the greater the electrical force (attraction or repulsion)
- As distance increases, electrical force lessens
Non-contact Force: Magnetic
- Magnet: An object that attracts metal iron
- Magnetic Pole: The place on a magnet where the force applied is the strongest
- Opposite poles (charges) attract each other
- Like poles (charges) repel each other
Affecting magnetic strength:
- Size of magnet: Larger magnets produce a stronger force
- Distance: The further away magnets are, the weaker the magnetic force
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Explore the fundamental concepts of forces, including contact and non-contact forces like gravity. Understand how friction, including static, sliding, and fluid friction, impacts motion. Learn about the law of universal gravitation.
