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diamong [38]
3 years ago
7

What is the difference between a contact force and a field force?

Physics
1 answer:
yuradex [85]3 years ago
7 0

Answer:

A contact force requires two objects to be touching, a field force works at a distance

Explanation:

- A contact force is a force that requires the two objects to be touching. An example of contact force is the frictional force: in fact, frictional force only occurs if the surfaces of the two objects involved touch each other, otherwise it is not present.

- A field force is a force that acts on a distance, i.e. the objects involved do not need to touch. Examples of field force are the gravitational force and the electric force: in fact, an object with mass m experiences a force of gravity when it is near a planet, but this force is present also when the object is not touching the planet. Similarly, electric charges experience an electric force when they are close to other electri charges, even when they are separated by a certain distance r. For this non-contact forces, we use the concept of field to identify the region of space in which an object experiences that force.

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The position of an electron is given by , with t in seconds and in meters. At t = 3.99 s, what are (a) the x-component, (b) the
egoroff_w [7]

Answer:

A. Vx = 3.63 m/s

B. Vy = -45.73 m/s

C. |V| = 45.87 m/s

D. θ = -85.46°

Explanation:

Given that position, r, is given as:

r = 3.63tˆi − 5.73t^2ˆj + 8.16ˆk

Velocity is the derivative of position, r:

V = dr/dt = 3.63 - 11.46t^j

A. x component of velocity, Vx = 3.63 m/s

B. y component of velocity, Vy = -11.46t

t = 3.99 secs,

Vy = - 11.46 * 3.99 = -45.73 m/s

C. Magnitude of velocity, |V| = √[(-45.73)² + 3.63²]

|V| = √(2091.2329 + 13.1769)

|V| = √(2104.4098)

|V| = 45.87 m/s

D. Angle of the velocity relative to the x axis, θ is given as:

tanθ = Vy/Vx

tanθ = -45.73/3.63

tanθ = -12.6

θ = -85.46°

7 0
3 years ago
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iris [78.8K]

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Hope this helps! :D
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