Force and Pressure Test

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Force and Pressure Test - 33

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Question 1
1 / -0

Which of the following force doesn't change with distance?

A
Electrostatic force

B
Gravitational force

C
Frictional force

D
Magnetic force

Solution

Gravitational, magnetic and electrostatic forces follow the inverse square law, i.e., the forces vary inversely as square of the distance. But frictional force does not depend on distance.
Question 2
1 / -0

It is better to use a sharp tipped nail than a blunt nail because :

A
The tip with the smallest area will produce a higher pressure when a force is applied.

B
A sharp tipped nail needs a larger force to drive it into the wooden surface

C
The sharp tip saves cost as less raw materials are required to make such nails

D
The sharp tip has a spiralling effect when the nail is hit on the head

Solution

Sharp tipped nail have a low area of contact which results in more amount of pressure even for a small amount of force, whereas blunt nail has more area of contact so it would provide less pressure for the same applied force. As pressure and area of contact are inversely related.
Hence option (A) is correct
Question 3
1 / -0

The pressure exerted by a women wearing shoes with pointed heels is ...... than what an elephant with one foot can exert on ground :

A
Much lesser

B
Much greater

C
Both equal

D
None of these

Solution

The pressure exerted by a women wearing shoes with pointed heels is much greater than what an elephant with one foot can exert on ground. This because of lesser area of contact of pointed heels.
Question 4
1 / -0

Fill in the blank.
Dams are ____ at the base.

A
thicker

B
thinner

C
same

D
can't say

Solution

$$Pressure=\frac{Force}{Area}$$
So pressure is inversely proportional to area of contact.
That is why area at base of dam is more as compared to the top so there is less pressure on base so it will be safe.
Question 5
1 / -0

It is easier to cut with a sharp knife than with a blunt one, This is because

A
sharp knife exerts more pressure

B
sharp knife exerts less pressure

C
both knives exert equal pressure

D
sharp knife has a better grip

Solution

It is easier to cut with a sharp knife than with a blunt one,
Blunt Blades have larger area compared to the sharp-edged blade.
Thus the applied force produces a lower pressure in case of blunt blades, which makes it difficult to cut the object.
Question 6
1 / -0

Which of the following has infinite range?

A
Gravitational force

B
Electromagnetic force

C
Strong nuclear force

D
Both a and b

Solution

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Question 7
1 / -0

Ask a friend to drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt you?

A
Because the nail has a sharp point and thus, exert less pressure on wood

B
The force is exerted on the wood, thus it has no effect on out head

C
The relatively large mass of the books and block on your head resists being moved

D
Action-reaction forces cancel out each other

Solution

The hammer delivers a big force for a very short time. That force on a very small nail may change its velocity quickly (big acceleration with big force because of small mass.)
However the big force does not last long enough to change the speed of the pile of books much (big force, big mass, small acceleration.) Therefore the pile of books does not transmit much force on to your heard because they have large inertia .
Question 8
1 / -0

A box exerts a force of $$420N$$ on a floor. The bottom of the box has an area of $$0.7m^2$$. What is the pressure exerted by the box on the floor?

A
$$600 Pa$$

B
$$500 Pa$$

C
$$400 Pa$$

D
$$700 Pa$$

Solution

Given, force, $$F=420N$$; area$$=0.7m^2$$;
Pressure, $$P=?$$
Pressure, $$P=\displaystyle\frac{Force}{Area}=\frac{F}{A}=\frac{420}{0.7}=600Pa$$
Question 9
1 / -0

The same force acting on a smaller area exerts a larger pressure, and a smaller pressure on a larger area.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Answer is A.

The same force acting on a smaller area exerts a larger pressure, and a smaller pressure on a larger area. This is the reason why a nail has a pointed tip, knives have sharp edges and buildings have wide foundations.
For example, When standing, a person will sink more into sand than when he lies flat stretched on sand. The body weight acts on a smaller area, in standing position, than when the person lies stretched over a larger area.
Hence, the statement is true.
Question 10
1 / -0

A force $$\displaystyle F_{1}$$ accelerates a particle from rest to a velocity v. Another $$\displaystyle F_{2}$$ decelerates the same particle from v to rest, then:

A
$$\displaystyle F_{1}$$ is always equal to $$\displaystyle F_{2}$$

B
$$\displaystyle F_{2}$$ is greater than $$\displaystyle F_{1}$$

C
$$\displaystyle F_{2}$$ may be smaller than, greater than or equal to $$\displaystyle F_{1}$$

D
$$\displaystyle F_{2}$$ cannot be equal to $$\displaystyle F_{1}$$

Solution

We cannot say anything about the magnitude of the forces because it is not mentioned by how much time each of the forces has taken to increase/decrease the velocity.

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Re-Attempt Weekly Quiz Competition

Force and Pressure Test - 33

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Force and Pressure Test - 33

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SHARING IS CARING

Question 1

Electrostatic force

Gravitational force

Frictional force

Magnetic force

Solution

Question 2

The tip with the smallest area will produce a higher pressure when a force is applied.

A sharp tipped nail needs a larger force to drive it into the wooden surface

The sharp tip saves cost as less raw materials are required to make such nails

The sharp tip has a spiralling effect when the nail is hit on the head

Solution

Question 3

Much lesser

Much greater

Both equal

None of these

Solution

Question 4

thicker

thinner

same

can't say

Solution

Question 5

sharp knife exerts more pressure

sharp knife exerts less pressure

both knives exert equal pressure

sharp knife has a better grip

Solution

Question 6

Gravitational force

Electromagnetic force

Strong nuclear force

Both a and b

Solution

Question 7

Because the nail has a sharp point and thus, exert less pressure on wood

The force is exerted on the wood, thus it has no effect on out head

The relatively large mass of the books and block on your head resists being moved

Action-reaction forces cancel out each other

Solution

Question 8

$$600 Pa$$

$$500 Pa$$

$$400 Pa$$

$$700 Pa$$

Solution

Question 9

True

False

Ambiguous

Data insufficient

Solution

Question 10

$$\displaystyle F_{1}$$ is always equal to $$\displaystyle F_{2}$$

$$\displaystyle F_{2}$$ is greater than $$\displaystyle F_{1}$$

$$\displaystyle F_{2}$$ may be smaller than, greater than or equal to $$\displaystyle F_{1}$$

$$\displaystyle F_{2}$$ cannot be equal to $$\displaystyle F_{1}$$

Solution

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