Stopping Distances OALH

Do Now

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1. State Newton’s third law

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2.State the two possibilities for an objects motion if the resultant force acting on it is 0N

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3. State 3 non-contact forces

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4.Write the equation linking force, mass and acceleration

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5.Calculate the uncertainty of these measurements: 5, 6, 4, 12

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Explain why, despite the moon exerting an equal and opposite force on the earth, the earth doesn’t orbit the moon

Key Knowledge LCWC

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What is the equation used to calculate stopping distance?

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Describe the forces acting on the car during thinking distance

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Describe the forces acting on the car during braking distance

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Whatis thinking distance?

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What is braking distance?

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What factors can affect braking distance?

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What is the equation used to calculate stopping distance?

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Describe the forces acting on the car during thinking distance

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Describe the forces acting on the car during braking distance

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Whatis thinking distance?

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What is braking distance?

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What factors can affect braking distance?

Recall Quiz

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Which of these statements is true?

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Thinking distance is the…

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A car travels 7m during a the driver’s reaction time, then a further 23m whilst the car is braking. What was the cars stopping distance?

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A car travels 46m whilst the car is braking. The total stopping distance was 56m. What was the cars thinking distance?

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List 5 factors that can affect braking distance

We Do

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A person drives a car A around a racetrack at 60m/s, the car in front breaks down so the driver needs to stop the car immediately. Car B is the same car as car A and also must stop immediately, but was driving at 30m/s. Assuming the driver’s reaction time is the same in both cars, explain in which car the stopping distance will be greater.

You Do

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Two cars are driving at 20m/s along a motorway. There is a queue of traffic up ahead so both react and step on the brakes at the same time. Car A has new tyres, whereas car B’s tyres are old and worn. Explain which car will have the shortest stopping distance.

You Do Challenge

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A car and a lorry are both travelling at 40mph. A traffic light turns red and both drivers react and step on the brakes. Both vehicles have new brakes and tyres. Explain which vehicle will have a shorter stopping distance.

Plenary

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1.Calculate stopping distance when thinking distance is 15m and braking distance is 40m

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2.Calculate braking distance when thinking distance is 20m and the stopping distance is 80m

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1. State Newton’s third law

2.State the two possibilities for an objects motion if the resultant force acting on it is 0N

3. State 3 non-contact forces

4.Write the equation linking force, mass and acceleration

5.Calculate the uncertainty of these measurements: 5, 6, 4, 12

Explain why, despite the moon exerting an equal and opposite force on the earth, the earth doesn’t orbit the moon

What is the equation used to calculate stopping distance?

Describe the forces acting on the car during thinking distance

Describe the forces acting on the car during braking distance

Whatis thinking distance?

What is braking distance?

What factors can affect braking distance?

What is the equation used to calculate stopping distance?

Describe the forces acting on the car during thinking distance

Describe the forces acting on the car during braking distance

Whatis thinking distance?

What is braking distance?

What factors can affect braking distance?

Which of these statements is true?

Thinking distance is the…

A car travels 7m during a the driver’s reaction time, then a further 23m whilst the car is braking. What was the cars stopping distance?

A car travels 46m whilst the car is braking. The total stopping distance was 56m. What was the cars thinking distance?

List 5 factors that can affect braking distance

Two cars are driving at 20m/s along a motorway. There is a queue of traffic up ahead so both react and step on the brakes at the same time. Car A has new tyres, whereas car B’s tyres are old and worn. Explain which car will have the shortest stopping distance.

A car and a lorry are both travelling at 40mph. A traffic light turns red and both drivers react and step on the brakes. Both vehicles have new brakes and tyres. Explain which vehicle will have a shorter stopping distance.

1.Calculate stopping distance when thinking distance is 15m and braking distance is 40m

2.Calculate braking distance when thinking distance is 20m and the stopping distance is 80m

3.Define thinking distance