# Physics P3

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• Created by: Clia
• Created on: 24-04-16 17:08
What is speed?
The distance travelled in a certain time
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How do you calculate acceleration?
Acceleration = Change in Speed / Time Taken
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Explain how to calculate speed from a distance-time graph?
The speed is the gradient of the increasing or decreasing flat lines
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What is the acceleration of a car from rest to a speed of 14m/s in 0.4sec
Acceleration = change in speed / time = (14-0) / 0.4 = 35m/s
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What is terminal speed?
The terminal speed is when both weight and air resistance are balanced so you fall at a constance speed
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What is the equation for Stopping Distance?
Stopping Distance = Thinking Distance + Braking Distance
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What are the two main factors that affect Thinking Distance?
1. How fast you are going 2. Your concentration (affected by tiredness, drugs, alcohol and distractions
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What are the four main factors that affect Braking Distance?
1. How fast you ar going 2. How heavily loaded the vehicle is 3. How good your brakes are 4. How good the grip is
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A 65kg Kangaroo is moving in a straight line at 10m/s. Calculate its momentum?
Momentum = Mass x Velocity = 65 x 10 = 650kg m/s
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Name the 3 main car safety features and describe how one helps to reduce the forces acting in accidents?
1. Crumple Zones- crumple and change shape on impact, increasing the time taken for the car to stop. 2. Air Bags- slow you down more gradually. 3. Seat Belts- stretch slightly, increasing time taken for the wearer to stop.
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What is G.P.E and the definition?
Gravitational Potential Energy and is energy due to height of an object
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What is Kinectic Energy and the equation?
Energy of movement. Kinetic Energy = 1/2 x mass x speed
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What do falling objects convert?
They convert G.P.E. into K.E.
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What is the equation for power and what is it measured in?
Power = Work Done / Time Taken. It is measured in Watts (J/s)
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A cars engine exerts a driving force of 1900N when travelling at a speed of 25m/s. Find its power output?
Power = Force x Speed = 1900 x 25 = 47 500 W (=47.5kW)
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## Other cards in this set

### Card 2

#### Front

How do you calculate acceleration?

#### Back

Acceleration = Change in Speed / Time Taken

### Card 3

#### Front

Explain how to calculate speed from a distance-time graph?

### Card 4

#### Front

What is the acceleration of a car from rest to a speed of 14m/s in 0.4sec

### Card 5

#### Front

What is terminal speed?