**Yr 10 Motion & Forces**

Speed and Velocity

Distance - time Graphs

Velocity - Time graphs

For an object moving at a steady speed in a straight line, the distance it travels and the time it takes are related as:

A straight diagonal line means an object is travelling at constant speed. The steeper the slope of the graph, the greater the speed it represents. Boys should be able to calculate the gradient of a distance-time graph.

Resistive Motion

F=ma

Sound Barrier

How fast is Usain Bolt?

What about in Kmh?

Tricky Extension Qu.

Ticker Timers

Usain Bolt V-t graph

Extension Question

Stopping Distance

F= ma & Resistive Motion

Velocity, acceleration and Graphs

**Lesson 1**

**Lesson 2**

**Lesson 3**

Stopping Distance

Tricky Extension Qu.

Effective steering?

Intelligent braking

An arrow is fired vertically into the air at 30m/s. Given that the acceleration due to gravity is 10m/s^2

how fast is the arrow moving after 1s,2s,3s,4s....?

How long does it take the arrow to reach maximum height?

What is the average speed, therefore what is the maximum height reached?

Draw a velocity time graph for the motion

What is the value of the area under the graph

Supersonic Freefall - Red Bull Stratos CGI

Draw the velocity time graph for an object falling from a height of 45m to the ground on earth?

Ignore air resistance

How do special forces parachute with large bags and not damage themselves when landing?

Close-proximity wing suit flying

Why do object fall at the same rate if their weight is different?

Dropping objects in the worlds largest vacuum chamber

Draw the velocity time graph for a parachutist falling earth, opening their parachute and then landing

Add to the graph the resultant forces at each point

Draw a distance time graph if you have time

ANS

Experiment Part 1:

Stupid Driving

Sketch the velocity time graph of a car traveling at 20m/s coming to a halt. The drive reacts to the danger in 0.5s and takes a further 4s to come to a halt. What is the de-acceleration of the car and the total stopping distance?

Monkey and Hunter