The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

A scooter weighs 120kg f. Brakes are applied so that wheels stop rolling and start skidding. Find the force of friction if the coefficient of friction is 0.4.

A

60kg f

B

48kg f

C

25kg f

D

32kg f

The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ $$\sqrt {\frac{{{\text{gra}}}}{{\text{h}}}} .$$

A

Less than

B

Greater than

C

Equal to

D

None of these

Consider the following statements.
A 4-wheel vehicle moving in a sharp circular path at high speed will
1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards
Which of these statements are correct?

A

Only 1 and 3

B

Only 2 and 4

C

only 2 and 3

D

Only 1 and 4

If b is the wheel track of a vehicle and h is the height of centre of gravity above road surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be

A

Less than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and greater than co-efficient of lateral friction

B

Less than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and also less than co-efficient of lateral friction

C

Greater than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and less than co-efficient of lateral friction

D

Greater than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and also greater than coefficient of lateral friction

If the car is moving on the level road at a speed of 50 km/h has a wheelbase 4 m, a distance of C.G. from ground 800 mm and distance from rear wheels is 1.2 m. Coefficient of friction is 0.8. What is the retardation if the brakes are applied to all wheels?

A

7.8 m/s2

B

6.8 m/s2

C

5.8 m/s2

D

4.8 m/s2

If the car is moving on the level road at a speed of 50 km/h has a wheelbase 4 m, a distance of C. G. from ground 800 mm and distance from rear wheels is 1.2 m. Coefficient of friction is 0.8. What is the retardation if the brakes are applied to the front wheels?

A

3.4 m/s²

B

2.4 m/s²

C

1.4 m/s²

D

4.4 m/s²

If the car is moving on the level road at a speed of 50 km/h has a wheelbase 3 m, a distance of C.G. from ground 700 mm and distance from rear wheels is 1.1 m. Coefficient of friction is 0.7. What is the retardation if the brakes are applied to the rear wheels?

A

3.7 m/s²

B

2. 7 m/s²

C

1.7 m/s²

D

4.7 m/s²

If the car is moving on the level road at a speed of 50 km/h has a wheelbase 4 m, a distance of C. G. from ground 800 mm and distance from rear wheels is 1.2 m. Coefficient of friction is 0.8. What is the retardation if the brakes are applied to all wheels?

A

7.8 m/s²

B

6.8 m/s²

C

5.8 m/s²

D

4.8 m/s²

Assuming that a vehicle is taking a left turn, The gyroscopic couple acting on the vehicle has a tendency to _____ the inner wheels and ____ the outer wheels.

A

Press, Lift

B

Lift, Press

C

Press, Press

D

Lift, Lift

The skidding of vehicles, while sudden brakes are applied, is avoided through _______

A

antilock braking system

B

engine management system

C

automatic car parking system

D

driving system

The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

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