PHYSICS MIDDLE SCHOOL

Select the correct answer.Which statement about forces is true?
A.
Forces are defined by strength but not direction.
B.
Forces are defined by direction but not strength.
C.
Forces are defined by both strength and direction.
OD. Forces act only on objects that are in contact.

Answers

Answer 1

Answer:

Answer:

Explanation:

Force is a vector quantity. So, it has magnitude and direction which can also be describe as strength and direction

Answer 2

Answer:

Answer:

Explanation:

Force has both direction and magnitude due to it being a vector quantity. Think of it this way--if I push you, what will happen to you?

Doesn't it depend on 1) how hard I pushed you, and 2) what direction I pushed you? Did I push you towards the wall? Towards a bed? How hard? Hard enough for you to fall?

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In an experiment,the group that is exposed to the variable to be tested is called

Which form of carbon in the figure above is the hardest

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Which terms refer to the smallest pure substances? A. mixtures and alloys B. molecules and atoms C. elements and isotopes D. metals and nonmetals

Answers

b. molecules and atoms

Where are the three parts of an atom located

Answers

An atom has an electron, proton, and a nucleus.

Electrons are negatively charged.
Protons are positively charged.
Neutrons are neutrally charged.

Which object moves in simple harmonic motion?\a stretched rubber band with an mass
b rolling ball going down a hill
c moving car
d orbiting satellite

Answers

Answer:Stretched rubber band with an mass

Explanation:

Simple harmonic motion requires a restoring force.

Simple harmonic motion should be periodic.

Option A:

When a rubber band is stretched,the internal forces of the rubber band pulls the band inside.So,internal forces are the restoring forces in a rubber band.

The motion is periodic as well since the the rubber band makes to an fro motion expanding ans contracting.

So,this performs SHM.

Option B:

There is no restoring force and no periodicity.

So,this is not SHM.

Option C:

There is no restoring force and no periodicity.

So,this is not SHM.

Option D:

There is periodicity but no restoring force.

So,this is not SHM.

2. A force of 24x10² N exists between a positive charge of 8x10-5C and a positive charge of 3x10C.What distance separates the charges?

Answers

Answer: 94.9 metres

Explanation:

Given that,

Force between the two charges (F) = 24x10² N

Negative charge (q1) = 8x10-5C

Positive charge (q2) = 3x10C

Distance between charges (r) = ?

Apply the formula for

F= (kq1q2) / r²

Recall that k is Coulomb's constant with a value of 9 × 10^9 Nm2C−2

Then,

24x10² N = (9 × 10^9 Nm2C−2 x 8x10-5C x 3x10C) / r²

24x10² N = (2.16 x 10^7) / r²

r² = (2.16 x 10^7 / 24x10² N)

r² = 9000

To get the value of r, find the square root

r = √9000

r = 94.868m (rounded to the nearest tenth as 94.9m)

Thus, a distance of 94.9 metres separates the charges.

Which of the following is an example of mattera.leaves
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which of the following is an example of chemical property to matter
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b.ability to break
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d.ability to freeze