Tag: physics

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Questions Related to physics

Multiple choice physics common machines kinds of simple machines inclined plane, wedge, screw and wheel and axle types of simple machines

If a nail requires 3 N force to insert into wood, then the value of force required to insert a screw into wood will be:

  1. Less than 3N

  2. Greater than 3N

  3. 3N

  4. Can't say
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A screw is preferred over a nail to insert into wood because it requires lesser force to insert. Therefore the value of force required to insert a screw in the given question is less than 3 N.

Multiple choice physics common machines kinds of simple machines inclined plane, wedge, screw and wheel and axle types of simple machines

The helical threading of a screw :

  1. increases the mechanical advantage

  2. helps to gain less inclination

  3. holds the wood more firmly than a screw

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
 A small torque applied to a screw  can exert a large axial force on a mass. Therefore, a threaded  component is said to produce a Mechanical Advantage.

(a) Helical threading increases the mechanical advantage.
(b) Also provide less inclination whenever heavy load  act on it.
(c) Helical threading means increasing pitch so it holds wood more firmly than a screw.
Multiple choice physics common machines kinds of simple machines inclined plane, wedge, screw and wheel and axle types of simple machines

A screw is preferred over a nail to insert into wood because :

  1. Screw holds more firmly than a nail.

  2. Less force is needed to insert a screw.

  3. Tip of a screw has more area of contact than nail.

  4. Fulcrum of the screw is at its head.
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

(a) Screw has thread like grip on it so it holds more firmly than a nail.

(b) You have apply  to torque to insert screw which require less force on the other hand nail require huge impulse to insert.
(c) Tip of both has approximately equal area.
(d) Fulcrum is a pivot around a lever turns ,or something that plays a central role. screw has it at its head.

Multiple choice physics common machines kinds of simple machines inclined plane, wedge, screw and wheel and axle types of simple machines

A car develops a force of 400 N and climbs up a vertical distance of 250 m. If the length of the road covered by the car is 5 km, then find the fractional change in load due to the car for the force developed.

  1. 19

  2. 20

  3. 21

  4. 22
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$ MA = \displaystyle \frac{L _{car}}{E _{car}} = \frac{EA}{LA}$
$\displaystyle \frac{L _{car}}{400} = \frac{5000}{250}$
$L _{car} = 8000 N$
Fractional change
$= \displaystyle \frac{L _{car}-E}{E}$
$= \displaystyle \frac{8000 - 400}{400}$
$= \displaystyle \frac{7600}{400}$
$=19$