Wheel and Axle

Q.

(1) Name five things which can roll. (2) Name five things which can slide. (3)Name five things which can both roll and slide.

Q.

Motion of wheel of a bicycle is______________.

Q.

Which of the following is an axial vector?

1. Displacement

2. Velocity

3. Torque

4. Force

Q.

Differentiate between a simple machine and a complex machine.

Q.

Mass of a body is 5 kg. What is its weight?

Q. Name the class of lever to which a crowbar belongs.

Q. Name the class of lever to which a see-saw belongs

Q.

The rod connecting the wheels in any vehicle is called a/an:

1. Lever

2. String

3. Pulley

4. Axle

Q.

List the types of simple machines.

Q.

The uniform plank of a see-saw is 8m long and is supported in the center. A boy weighing 50 kgf sits at a distance of 2.5 m from the fulcrum. Where must another boy weighing 40 kgf sit, so as to balance the plank?

Q. A body executes SHM under the action of F1 force with time period 0.8 s. If there force is changed to F2, it executes time period of 0.6 s. Now both F1 and F2 act simultaneously in the same direction. What is the new Periodic time?

Q. Consider a trolley (hand truck) which is used in a supermarket to hold objects. Which simple machines are a part of the trolley?

1. A pulley and a wheel and axle

2. An inclined plane and a wheel and axle.

3. A wedge and a pulley

4. A lever and a wheel and axle

Q. The mechanical advantage of an actual pulley is less than 1. Give a reason. What is the justification for using the pulley then?

Q.

The handle of a bicycle acts as class one lever

1. True
2. False

Q.

A fire tongs is a lever of :

1. First-order

2. Second-order

3. Third-order

4. None of these

Q. Draw a diagram to illustrate the positions of fulcrum, load and effort, for a nutcracker.

Q.

The handle of a water pump is $90cm$ long from its piston rod. If the pivot handle is at a distance of $15cm$ from the piston rod, calculate the least effort required at its other end to overcome a resistance of $60kgf$.

Q.

Which among the options are the simple machine found in the bicycle ?

1. Wedge

2. Pulley

3. Lever

4. Wheel and axle

Q.

A screwdriver is an example of of a/an

1. pulley

2. inclined plane

3. lever

4. wheel and axle

Q. How does the friction at fulcrum affect the mechanical advantage of a lever?

Q.

Wheel with a rotating axle is an example of a ______ .

1. Simple machine

2. Third class lever

3. Complex machine

4. Pulley

Q. Name the class of lever to which a wheel barrow belongs.

Q. State true or false:
The mechanical advantage of an inclined plane is always greater than 1.

1. True
2. False

Q.

What is lever? State its kinds and support your answer by at least two examples

Q.

Write the similarities and differences between the motion of a bicycle wheel and a ceiling fan that has been switched on. [5 MARKS]

Q.

Which one of the following statement is true for an ideal machine?

1. For an ideal machine, the work done by the machine is always equal to the work done on it.

2. For an ideal machine, the work done by the machine is always greater than the work done on it.

3. For an ideal machine, the work done by the machine is always less than the work done on it.

4. For an ideal machine, the work done by the machine is never equal to the work done on it.

Q.

Which of the following simple machine is used for linear motion?

1. Inclined plane

2. Screw

3. Wheel and axle

4. Wedge

Q. Draw a diagram to illustrate the positions of fulcrum, load and effort, for a pair of forceps.

Q. Give one example to indicate that the application of a force slows down motion.

Q.

Identify the simple machine which is responsible for changing the point of application of force.

1. Screw

2. Wheel

3. Wedge

4. Lever