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Forces Newton’s Laws
- 1. Forces- Newton’s Laws GCSE Year 11
- 6. Continues at constant speed in a straight line…
- 16. Graph and Results Table for Girder One Calculate the Gradient of the middle line using m = (y2-y1) / (x2-x1) and two points on the line of best fit.
- 24. Sinks it…
- 27. Missed it…
- 28. Circular Motion
- 31. Bucket on a rope Electron around a nucleus Planetary Motion Car turning a corner Tension Electrostatic Gravity Friction Add to the diagrams the direction and name of the force causing the object’s motion +ve
- 33. Gravity On Gravity Off I’m so lonely right now…
Notas do Editor
- An elevator or even a rollercoaster alters this support force – the effect you feel when the elevator or coaster moves up (feel heavier) is because this force is increased, the reverse is true as well. This change in applied force is what makes it so entertaining and exciting! But when you are sitting still, or at rest, these forces are balanced. It’s difficult to grasp the idea that a chair or a table could be applying a force but this is the same as the force you would need to hold up a heavy object in your hand – there is no denying that you are definitely applying a force against its weight.
- You would expect the keeper to apply a push force when he kicks the ball that will change the direction and speed of the ball, but no extra force is applied. No net force is acting on the ball so it moves with constant speed in a straight line. Yes, there is some tiny frictional force and air resistance but on a wet flat surface we can assume it makes little difference.
- Futurama episode when Bender takes a nap in the missile launch tube and ends up getting fired into space while the ship is already going at top speed. Bender can’t slow down, he keeps drifting at that constant speed in a straight line. Out in space what forces would be acting on Bender as he moves further and further away from the space ship? None, there is no resultant or net force yet he keeps moving. The design of cars need to consider streamline, aerodynamics to reduce the air resistance so they can get to a top space with less force from the engine, once the forces are balanced the car can’t go any faster.
- Vancouver Winter Olympics 2010, Men’s ice hockey final – Canada 3, USA 2 after overtime. Sidney Crosby of the Pittsburgh Penguins scores to claim gold for the Canadians The Physics of the slapshot – The link between force and velocity, what were the 4 effects of a force? Change speed, direction, shape or start/stop motion. For the puck during a slapshot, which of these would you consider the force is causing to happen?
- The Father of Classical Physics - Sir Isaac Newton FRS (4 January 1643 – 31 March 1727 [ OS : 25 December 1642 – 20 March 1726]) [1] was an English physicist , mathematician , astronomer , natural philosopher , alchemist , and theologian who is considered by many scholars and members of the general public to be one of the most influential men in human history .
- Air track with light gate sensors and pulley (force of tension in the string = the weight, friction at a minimum) Diagram Results – Force 0.2 N, increase by 0.2 N up to 1 N Change in Velocity, Acceleration, average of three, m/s^2 The same two heading but for an object half the mass.
- Video on left, click to begin
- Handout – graph and results table Each reading is 0.2 N increase Draw a line of best fit for the middle acceleration line.
- The shape of the graph indicates there is a relationship between the two variables. For a straight line graph this is a directly proportional relationship. There is a factor that links the two variables which is represented by the gradient of the graph The factor that links the resultant force acting on an object and the acceleration of the object is its mass.
- Each reading is 0.2 N increase Calculate the gradient
- Newton’s second Law shows the relationship between the size of the force applied, the mass of the object and the rate of change of velocity the object experiences. If the mass stays the same and the force is increased, a bigger acceleration occurs (to balance out the equation) If the mass increases and the force stays the same then the acceleration is smaller
- Handout with Newton’s 2 nd law and these next 2 questions Negative acceleration and two forces acting
- Draw out a force diagram displaying the conditions
- Again a force diagram helps to visualise what is happening, extra force included
- If an object is moving at a constant speed its motion can still be described as accelerating as long as it moves in a circle. The speed is constant but the direction of motion is always changing . How does this stay constant with Newton’s 1 st Law? Acceleration is the rate of change of velocity, a vector, if the direction is changing then the velocity must also be changing. There must then be an unbalanced force causing this change in motion Demo – bucket swung on the end of string. (The few times where a Physics teacher has the chance to show-off!) To keep the bucket moving in a circle the string has to be continually ‘pulled’ in. The force, or tension in the string causes the acceleration of the bucket. Fill the bucket up with water, move from a vertical swing to a horizontal swing. For the water inside the bucket not to move relative to the movement of the bucket, for there to be no change in its relative motion, what must the condition of the forces be on the water? Balanced, the water pushes out against the bucket to counter the reaction force caused by the tension and the bottom of the bucket. Similar to the
- The excitement and thrill of the Round-up, fairground ride where centripetal force is in action! Sometimes called 'Meteorite' or 'Meteor‘ as a kid this was the first ride that I was instantly hooked on, I found it amazing how you could ‘stick’ to the walls, lifting your arms or legs against the force was quite an effort!
- How will the force needed to keep an object moving in a circle vary when… object becomes more massive (the bucket on the end of the rope filled with concrete rather than water)? circular path has a smaller radius (a car trying to turn a corner tighter)? speed of the object is increased (the Moon’s motion around the Earth increases, changing direction faster, larger acceleration)?
- All linked into F = ma, a bigger force is needed to accelerate the object faster
- Click on the green or red boxes to see the different conditions