Wedges

Q.

An uniform metre scale of weight 50 gf is balanced at 40 cm mark when a weight of hundred 100 gf is suspended at 5 cm mark. Where must a weight of 80 gf be suspended to balance meter scale?

Q.

(a) What is a wedge? Give three practical examples of a wedge.

(b) What for a wedge is employed commonly?

Q.

A wedge is a simple machine that can be used to split objects.

1. True

2. False

Q.

Two inclined planes combine to give a ___ .

Q. A ___________ is a simple machine that can be used to split objects.

1. wedge
2. pulley
3. wheel and axle
4. inclined plane

Q.

Define the mechanical advantage of an inclined plane.

1. M.A = Inclined length/Vertical height

2. M.A = Effort/Load

3. M.A = 1

4. M.A = Vertical height/Inclined length

Q.

Which of the following machines act as a wedge?

1. Axe.

2. lever

3. Wheels

4. Inclined plane

Q. The ship cuts through the water because its front is shaped like a/an:

1. Inclined plane
2. Lever
3. Wedge
4. Pulley

Q. A wet open umbrella is held vertical & is whirled about the handle at uniform rate of 21 rev in 44 sec . if the rim of umbrella is a circle of 1 m in diameter & the height of the rim above the floor is 4. 9 m , then the angular speed of umbrella?

Q.

Which simple machine is used to split or pierce materials like logs of wood?

1. inclined plane

2. wedge

3. screw

4. crowbar

Q.

A force of $5kgf$ is required to cut a metal sheet. A shear is used for cutting a metal sheet; its load arm is $5cm$ long while its effort arm is $10cm$ long. What effort is needed to cut a sheet?

1. 2.5 kgf

2. 3.0 kgf

3. 5.0 kgf

4. 2.0 kgf

Q.

Scissors constitute of which simple machines?

1. Pulley and lever

2. Wedge and lever

3. Pulley and inclined plane

4. Wedge and pulley

Q. Which of the following is not the component of a pulley?

1. Fulcrum
2. Wheel
3. Load
4. Rope

Q.

A wedge possesses ______ inclined planes.

1. 0

2. 3

3. 2

4. 4

Q.

A wedge is a simple machine that can be used to split objects.

1. True

2. False

Q.

A lever works on the principle of _____

1. moments

2. velocity

3. speed

4. acceleration

Q.

The fixed point about which the lever turns is called ____.

1. fulcrum

2. effort

3. load

4. load arm

Q.

Observe the given figure and calculate the resistance (R) offered by the nut when the effort of 45 N is applied.

1. 135 N

2. 140 N

3. 120 N

4. 160 N

Q. A single pulley acts as force multiplier.

1. False
2. True

Q.

Sneha has to lift a load of mass 50 kg to a height 1m. She can exert a maximum effort of 250 N, so she uses an inclined plane to lift the load up. What should be the minimum length of the plank used by her?

1. 1m

2. 2.5m

3. 2m

4. 1.5m

Q. Which of the following requires a pulling force?

1. Zipping
2. Climbing a rope
3. Putting on socks
4. Lifting a pen
5. Opening fridge
6. Kicking a ball
7. Swimming
8. Throwing a stone

Q. ntQ. A smooth wedge A is fitted in a chamber hanging from a fixed ceiling near the earths surface. A block B placed at the top of the wedge takes time T to slide down the length of the wedge and the cable supporting the chamber is broken at the same instant, the block will ben nt(a) take a longer time T to slide down the wedgen nt(b) take a time shorter than T to slide down the wedgen nt(c) remain at the top of the wedgen nt(d) jump off the wedgen

Q.

A uniform metre scale is kept in equilibrium. It is supported at the 60 cm mark and a mass M is suspended from the 90 cm mark as shown in the figure. What is the relation between the weight of the scale and the weight of mass M?

1. The weight of the scale is greater than that of the weight of mass M.

2. The weight of the scale is lesser than that of the weight of mass M.

3. The weight of the scale is equal to than that of the weight of mass M.

4. The weight of the mass is zero.