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Questions and Answers
What is meant by deceleration?
Deceleration refers to a decrease in speed or a negative acceleration.
Suggest one reason why the car does not begin to decelerate at t = 0.
The brakes may not have engaged immediately, or the driver might not have applied enough force on the brakes.
What property of a distance–time graph corresponds to speed?
The slope of the graph represents speed.
Using Fig. 1.1, determine the initial speed v of the car.
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Explain why the deceleration of the car is greater than m.
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Explain why the deceleration is not constant.
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Study Notes
Deceleration and Forces
- Deceleration is the rate of decrease of speed.
- The car does not decelerate immediately because of a delay in the braking system, such as the reaction time of the driver.
- The distance-time graph shows the speed of the car because the gradient of the distance-time graph is equal to the speed.
- The initial speed of the car is calculated by finding the gradient of the graph between the points 0 and 1 second.
- Since the resistive force is constant, the deceleration of the car is greater than F/m because the frictional force between the tires and the road also acts in the opposite direction of motion.
- Deceleration is not constant because the frictional force between the tires and the road changes as the speed of the car changes.
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Description
This quiz explores the concepts of deceleration and the forces acting on a car during braking. It covers how speed changes over time, the role of friction, and how to interpret distance-time graphs. Test your understanding of these fundamental principles of physics.
