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Deceleration and Forces

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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.

v = 20 m/s Signup and view all the answers

Explain why the deceleration of the car is greater than m.

The resistive force from the brakes is greater than the mass times the gravitational acceleration acting on the car. Signup and view all the answers

Explain why the deceleration is not constant.

The resistive forces can vary depending on factors like brake intensity and road conditions. Signup and view all the answers

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.