Free Printable Fricition

1.

Friction _____________ motion

a)

Works in the same direction as

b)

Opposes

c)

Has not effect on

d)

Pulls against

2.

True or False: objects that are smooth have LESS friction than objects that are rough

a)

TRUE

b)

FALSE

3.

When you jump out of a plane to go skydiving 🪂 you thankfully have a parachute so you can safely land 🛫. Which answer choice explains why the parachute helps you land safely

a)

While gravity pulls you down very quickly, Air Resistance (fluid friction) pushes back against gravity and your parachute, slowing you down

b)

While gravity pushes you down very slowly, Air Resistance (fluid friction) pulls back against gravity and your parachute, which means you can land safely

c)

When you have a parachute gravity is not able to pull you down as fast as it normally can

d)

The parachute will get caught on something on your way down which will save your life

4.

What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12?

a)

65 N

b)

226 N

c)

175 N

d)

114 N

5.

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?

a)

0.78

b)

0.51

c)

0.78 N

d)

0.58 N

6.

Sally experiences-

a)

Rolling Friction

b)

Sliding Friction

c)

Fluid Friction

d)

Static Friction

7.

Wheels of a shopping cart experience-

a)

Rolling Friction

b)

Sliding Friction

c)

Fluid Friction

d)

Static Friction

8.

Swimming fish experience-

a)

Rolling Friction

b)

Sliding Friction

c)

Fluid Friction

d)

Static Friction

9.

Maximum efficiency is considered only for raising the load

a)

True

b)

False

10.

When coefficient of friction between screw and nut is given we can find directly

a)

Friction angle

b)

Helix angle

11.

If screw thread diameter is 50 mm and pitch is 12 mm, then helix angle in degree is

a)

5.37

b)

2.37

c)

3.37

d)

4.37

12.

If friction angle is greater than helix angle then the screw condition is

a)

Self locking

b)

Angle of repose

c)

non Self locking

d)

None of the choices

13.

Efficiency of self locking screw is always less than what percentage

a)

50

b)

60

c)

75

d)

55

14.

If friction angle is 2 and helix angle is 3.Determine screw jack efficiency (a) %

(Type only value without units, should be an integer)

15.

If pitch is 10 mm and then load is lifted to 200 cm, then no. Of turns required to lift the load is (a)

(Type only value without units, should be an integer)

16.

The efficiency of screw jack for raising the load is

a)

$\frac{\tan\alpha}{\tan\left(\alpha-\phi\right)}$

b)

$\frac{\tan\alpha}{\tan\left(\alpha+\phi\right)}$

c)

$\frac{\tan\alpha}{\tan\left(\phi-\alpha\right)}$

d)

$\frac{\tan\phi}{\tan\left(\alpha+\phi\right)}$

17.

The efficiency of a screw jack is maximum, when

a)

$\alpha=45\degree+\frac{\phi}{2}$

b)

$\alpha=45\degree-\frac{\phi}{2}$

c)

$\alpha=90\degree+\phi$

d)

$\alpha=90\degree-\phi$

18.

The following is not a friction clutch-

a)

1. Fluid clutch

b)

2. Centrifugal clutch

c)

3. Cone clutch

d)

4. Disc clutch

19.

The following is an automatic clutch which is controlled by engine speed-

a)

1. Cone clutch

b)

2. Centrifugal clutch

c)

3. Fluid clutch

d)

4. Disc clutch

20.

The clutch allows the engine to __________ while the vehicle has stopped.

a)

Go faster

b)

Go slower

c)

Disengaged

d)

Engaged

Fricition_Quiz 1

Total questions: 20

Worksheet time: 38mins

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