Gears

Q.

What will be the direction of motion of other gears when gear 1 moves in the clockwise direction?

1. Gear 2:- Clockwise

   Gear 3:- Anticlockwise

   Gear 4:- Clockwise

2. Gear 2:- Clockwise

   Gear 3:- Clockwise

   Gear 4:- Clockwise

3. Gear 2:- Anticlockwise

   Gear 3:- Clockwise

   Gear 4:- Anticlockwise

4. Gear 2:- Anticlockwise

   Gear 3:- Anticlockwise

   Gear 4:- Anticlockwise

Q.

Question 2 (v)

Fill in the blank:

Motion of wheel of a bicycle is ___.

Q.

A spinning top is an example for ___ Motion.

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Q.

Give an example for following types of motion. [3 MARKS]

1) Linear motion

2) Circular motion

3) Rotational motion

Q. Define the following types of motion:
1) Translational motion
2) Oscillatory motion
3) Circular motion​​​​​​​

Q.
If the smallest gear rotates in clockwise direction, in which direction will the largest gear rotate?

1. Clockwise direction
2. Anti-clockwise direction
3. Move forward
4. Will not rotate at all

Q. What is the difference between circular and rotational motion?

Q.

A machine displaces a load of 125kgf through a distance of 0.30m, while an effort of 12.5kgf acts through a distance of 4.0m. Calculate the velocity ratio.

Q.

When a larger gear is turning a smaller gear, the smaller gear

1. does not rotate

2. rotates faster

3. rotates slower

4. rotates with the same speed

Q.

What is the difference between circular and rotatory motion?

Q.

How is mechanical advantage related to the velocity ratio for an ideal machine?

1. Mechanical advantage is equal to the velocity ratio.

2. Mechanical advantage is always greater than the velocity ratio.

3. Mechanical advantage is always less than the velocity ratio.

4. None of these.

Q. A point on a rotating fan blade is undergoing ___ motion.

Q. Is it possible that an object moving with decreasing speed have constant acceleration?

Q.

Which of the statement is not true for an actual machine?

1. Its mechanical advantage is less than the velocity ratio.

2. Its efficiency is always less than 100%

3. Its mechanical advantage is greater than the velocity ratio

4. The output of the machine is always less than the input

Q.

The tip of the second's hand is in a circular motion with respect to the centre of the clock.

1. True

2. False

Q.

If the number of teeth in the driven gear of a vehicle is less than that of the driving gear, the vehicle

1. Loses speed

2. Gains speed

3. Gains momentum

4. Both (b) and (c)

Q. What is the ratio between mechanical advantage and velocity ratio of a practical machine

Q. Velocity ratio of gear is equal to

1. Number of teeth on driven wheel / number of teeth on driving wheel
2. Number of teeth on driving wheel / number of teeth on driven wheel
3. None
4. Both

Q.

The rod that passes through the center of the pulley is called its

1. 2m

2. 1m

3. 2.5m

4. 1.5m

Q.

Which gear will have the maximum speed of rotation in the system of gears given in the below image?

1. Gear 2

2. Gear 4

3. Gear 3

4. Gear 1

Q. Differentiate between rotational and curvilinear motion.
[2 marks]

Q.

Give two reasons why the efficiency of a single movable pulley is not $100\%$.

Q.

Boojho was riding his bicycle along a straight road. He classified the motion of various parts of the bicycle as (i) rectilinear motion, (ii) circular motion and (iii) both rectilinear as well as circular motion. Can you list one part of the bicycle for each type of motion? Support your answer with reason.

Q. Give two reasons why the efficiency of a single movable pulley is not 100%

Q.

When a larger gear drives a smaller gear, the smaller gear:

1. Rotates with the same speed
2. Rotates slower
3. Does not rotate
4. Rotates faster

Q. Boojho was riding his bicycle along a straight road. He classified the motion of various parts of the bicycle as (i) rectilinear motion, (ii) circular motion and (iii) both rectilinear as well as circular motion. Can you list one part of the bicycle for each type of motion? Support your answer with reason. [3 MARKS]

Q. Name the type of force which acts in the following case:
A boy opens the door.

Q.

Suppose a gear has a yellow mark on one of its teeth. The gear starts moving. What are the motion of the gear and the motion of the yellow mark respectively?

1. Oscillatory motion

2. Circular motion

3. Rectilinear motion

4. Rotational motion

Q. Is circular motion 1 dimensional or 2 dimensional motion?

Q.

A crowbar of length 2.0 m is used as a machine to lift a box of 100 kg f by placing a fulcrum at a distance of 0.1 m from the box. Calculate the Velocity ratio