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3 years ago

Which are examples of contact forces?

Chemistry

1 answer:

lesantik [10]3 years ago

8 0

Answer:

Contact force is a force that requires a contact between two bodies and is ubiquitous in nature

Explanation:

The force is distributed in two categories i.e

Contact force

Non-Contact force

Contact Forces are the forces which is requires a contact between two bodies to occur.

The Types of contact forces are given below:

Frictional Force

Tension Force
Normal Force
Air Resistance Force
Applied Force
Spring Force

Some common daily examples of the contact force are

Frictional force between the tyres of a moving vehicle and the road.
Air flowing in opposite direction of a moving object.
Pushing a table with hand and the friction between its base and floor.
Stretching a rubber band with hands etc.

Also non-contact forces are Gravitational force, Electrical force and Magnetic force.

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Read 2 more answers

If the half-life of a radioactive element is 4 days, how long will it take for three- fourths of a sample of the element to deca

Jlenok [28]

Answer:

$\boxed{\text{8 da}}$

Explanation:

The question will be easier to solve if we interpret it as, " How long will it take until one-fourth of a sample of the element remains,?"

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After one half-life, half (50 %) of the original amount will remain.

After a second half-life, half of that amount (25 %) will remain, and so on.

We can construct a table as follows:

$\begin{array}{cccl}\textbf{No. of} & & \textbf{Fraction} & \\\textbf{half-lives} & \textbf{t/da} & \textbf{remaining} & \\1 & 4 & \dfrac{1}{2} & \\\\2 & 8 & \dfrac{1}{4}& \\\\3 & 12 & \dfrac{1}{8}& \\\end{array}$

$\text{We see that 8 da is two half-lives, and the fraction of the element remaining is $\frac{1}{4}$.}\\\text{It takes $\boxed{\textbf{8 da}}$ for three-fourths of the element to decay}$

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