2.2 Resultant force = 15 – 10 = 3a + 5a = Try these sums

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Presentation transcript:

2.2 Resultant force 6 + 5 = 15 – 10 = 3a + 5a = Try these sums 26 April 2017 6 + 5 = 15 – 10 = 3a + 5a = 100N – 50N = 40 – 40 = 100N – 200N = 50kN – 25kN = 1kN – 500N = Try these sums

2.2 Resultant force 6 + 5 = 11 15 – 10 = 5 3a + 5a = 8a 26 April 2017 6 + 5 = 11 15 – 10 = 5 3a + 5a = 8a 100N – 50N = 50N 40 – 40 = 0 100N – 200N = -100N 50kN – 25kN = 25kN 1kN – 500N = 500N (1k = 1000)

2.2 Resultant force What is a resultant force? 26 April 2017 What is a resultant force? What happens if the resultant force is zero? What happens if there is a resultant force? Voyager 2 was launched in 1974. Since then it has had no main rocket engine to power it. The spacecraft is now at the edge of the Solar System travelling at 60 000 mph! How can it keep going?

Resultant force A single force used to represent all the forces on an object. Resultant = 10N 10N 20N What is the missing resultant force? 10N = ? 20N

Newton’s 1st Law of motion When the resultant force on an object is zero: An object stays still Has a constant velocity Explain how a skater carries on moving with no effort on ice. Which force is zero on ice?

When the resultant force is not zero the object changes its velocity. What happens when the: Weight is more than the Lift force? Lift is more than the Weight? Weight equals the Lift?

Accidents Draw a diagram to show the lorry hitting the car. Include: The direction the lorry was travelling The force needed to stop the lorry The force on the car.

Investigation Use a trolley to look at Newton’s 1st Law. When the resultant force on an object is zero: An object stays still Has a constant velocity Use a trolley to look at Newton’s 1st Law. How can you get the trolley to move at a constant speed? Which forces must be balanced for this to happen? books Trolley

Key Points Start Resultant Force Effect on object 1 At rest Zero Copy this table Start Resultant Force Effect on object 1 At rest Zero Stays at rest 2 Moving Velocity stays the same 3 In direction of movement. Accelerates 4 Against direction of movement Decelerates