Tag: a little effort, lot of work

Quizzes (2) Questions (46)

Questions Related to a little effort, lot of work

Multiple choice physics a little effort, lot of work motion in application common machines introduction to simple machines

The law of a certain lifting machine is $P =W/50+ 1.5$. The velocity ratio of the machine is 100. Find the maximum possible mechanical advantage and maximum possible efficiency of the machine

  1. 50 and 50%

  2. 50 and 60%

  3. 60 and 60%

  4. 60 and 50%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The law of the machine is P = W/50 + 1.5. The maximum mechanical advantage is the reciprocal of the coefficient of W, which is 50. Efficiency is (Mechanical Advantage / Velocity Ratio) * 100, so (50/100) * 100 = 50%.

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

In a wheel-and-axle :

  1. wheel rotates freely on axle

  2. wheel is fixed to the axle

  3. direction of the force remains same'

  4. mechanical advantage is always more than one
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a wheel-and-axle, the wheel and the axle are rigidly connected so that they rotate together around the same axis.

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

Wheel-and-axle and rope move in :

  1. Same direction

  2. Opposite direction

  3. Perpendicular direction

  4. There is no relation between the two
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a wheel-and-axle system, the rope wrapped around the axle moves in the same direction as the rotation of the wheel.

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

In a wheel-and-axle :

  1. Wheel rotates freely on axle

  2. Wheel is fixed to the axle

  3. Direction of the lbrce remains same

  4. Mechanical advantage is always more than one
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A wheel-and-axle is defined by the wheel and axle being fixed together so that they rotate as a single unit.

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

In the wheel and axle arrangement,wheel and axle and the rope move in:

  1. same direction

  2. opposite direction

  3. perpendicular direction

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a wheel-and-axle system, when the wheel rotates in one direction, the rope attached to the axle moves in the opposite direction relative to the pulling force required to wind it.