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Stopping distance is braking distance and reaction distance.

# Forces - Forces and Braking

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Understanding braking forces is an important part of being able to drive. Knowing approximately how far it will take you to stop is not just important for yourself, but also for the safety of other road users.

1.
A car stops in 20 m when traveling at 30 kilometers per hour. If the car is traveling at 40 kilometers per hour, how far does the car take to stop?
20m
26m
27m
30m
Some questions regarding braking can be answered by using nothing more complicated than simple ratios to calculate distances
2.
What can affect a vehicle's braking distance?
Worn brakes
Worn tires
All of the above
Braking distance can be severely reduced by any of the above which is why it is important to regularly check for brake and tire wear. It is also important to leave a larger gap between cars in poorer weather conditions. Speed also affects the braking distance so it is also important to leave a larger gap between cars moving at high speeds
3.
What can affect a driver's reaction time?
Drink
Drugs
Tiredness
All of the above
The other factor is distraction - talking to passengers, using their cell phone, loud music and so on
4.
Which of the following statements is true?
The greater the speed of a vehicle, the greater the braking force needed to stop it within a certain distance
The smaller the speed of a vehicle, the greater the braking force needed to stop it within a certain distance
The greater the speed of a vehicle, the less braking force is needed to stop it within a certain distance
The greater the mass of a vehicle, the less braking force is needed to stop it within a certain distance
The driver needs to push the brake pedal harder. This could lead to the dangerous situation where the force of braking locks up the wheels. When this happens, the driver has little control over the vehicle. To avoid this danger, most vehicles are now equipped with anti-locking braking systems
5.
Which statement is true?
When the brakes are applied, work done by friction between the brake and wheel increases the kinetic energy of the vehicle and decreases the temperature of the brakes
When the brakes are applied, work done by friction between the brake and wheel reduces the kinetic energy of the vehicle and increases the temperature of the brakes
When the brakes are released, work done by friction between the brake and wheel reduces the kinetic energy of the vehicle and increases the temperature of the brakes
When the brakes are applied, work done by friction between the brake and wheel reduces the kinetic energy of the vehicle and decreases the temperature of the brakes
Energy can only be transferred, so the kinetic energy of the car needs to be transferred into another form - in this case the heat in the brakes
6.
If a car is traveling at a steady speed, what can be said of the driving and resistive forces acting on the car?
In equilibrium
Driving forces are twice as large as the resistive forces
Resistive forces are twice as large as the driving forces
There are no resistive forces acting on the car at a steady speed
Whenever forces are in equilibrium, motion is either unchanging or the object is stationary
7.
What is braking distance?
The distance traveled in 10 seconds when a car is accelerating
The distance traveled while the brakes are applied
The distance required to accelerate to 100mph
The energy required to stop in a given distance
Faster speeds mean greater braking distances are required. Careful drivers therefore leave more of a gap between their vehicle and the one in front at higher speeds
8.
What is the greatest resistive force a car experiences when no braking forces are applied?
Air resistance
Passenger weight
Stones
Rain
This is created as the vehicle collides with air molecules
9.
What is stopping distance?
Braking distance
Reaction time
Braking distance and reaction distance
Reaction distance
The stopping distance is the distance the car will travel in total. This takes into consideration how long it takes a driver to react to a situation and consequently the distance traveled during this period. It also takes into consideration the distance the car takes to stop once the brakes have been applied
10.
If a driver's reaction time is 0.2 s and the braking time when their car is traveling at 10 m/s is 10 s, how far does the car travel before it comes to rest?
100m
101m
102m
103m
At a speed of 10 m/s, the car travels one meter every 0.1 second so with a thinking time of 0.2 seconds, the car will have traveled 2 meters. That is then added to the 100m that it travels during the other 10 seconds required for it to stop
Author:  Martin Moore