Question

5. The diagram shows the horizontal forces on a car travelling to the right along a level road. air resistance and friction 550N driving force 950N
(a) How can you tell that the car is accelerating?
(b) What is the resultant force of car?
(c) Describe how the horizontal forces on the car change when the driver applies the brakes ​

Answer 1

(a) The car will accelerate when the applied force (driving force) is greater that frictional force.

(b) The resultant force of the car is 400 N.

(c) The net horizontal forces on the car becomes zero when the driver applies brakes.

Acceleration of the car

The car will accelerate when the applied force (driving force) is greater that frictional force.

Resultant force of the car

The resultant force of the car is calculated as follows;

∑F = 950 - 550

∑F = 400 N

Horizontal forces on the car

The net horizontal forces on the car becomes zero when the driver applies brakes.

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