1. 2_5 Falling Objects Force = mass x ___________ Speed = _______ time Velocity is _______ in a given _________ Acceleration = ________________ time 13 March 2016 What are the missing terms?

2. 2_5 Falling Objects Force = mass x acceleration Speed = distance time Velocity is speed in a given direction. Acceleration = Change in velocity time 13 March 2016

3. 2_5 Falling Objects What is the difference between mass and weight? What is the terminal velocity? 13 March 2016 The World record downhill skiing record is 250.7 km/h! How does this suit allow the skier to achieve this?

4. Mass and Weight Weight (N) = mass (kg) x gravitational field strength (N/kg) Earth g = 10 N/kgMars g = 4 N/kgMoon = 1.6 N/kg If an object has a mass of 60kg on the Earth how much does it weigh on each of the places shown above? Weight on Earth = Weight on Mars = Weight on the Moon =

5. Falling objects Free fall – only weight acts on an object. Acceleration = gravitational field strength. In a fluid drag increases as speed increases.

6. Velocity-time graph 1.Why is there a difference in the 2 lines? 2.What is the terminal velocity in a liquid? Velocity, m/s Time, s 3.0 2.5 2.0 1.5 1.0 0.5 0.0 00.050.100.150.200.25 falling in air Falling in liquid

7. 2_5 Falling objects Summary 1.The weight of an object is the force of gravity on it. 2.An object falling freely on Earth accelerates at about 10m/s 2. 3.An object falling in a fluid eventually reaches its terminal velocity.

8. Mass and Weight Mass measures how much of something there is. More mass makes it harder to accelerate an object. Weight measures how much a mass is attracted to another e.g. towards the Earth. Weight (N) = mass (kg) x gravitational field strength (N/kg)