CP2 – Forces & Motion (p145-155) Velocity-time graph QUESTIONS Q1) how do you calculate speed? Q2) What is happening at each stage on the graph Q3) What is the acceleration during stage A? Q4) What was the total distance travelled during this journey? Define the following: Vector = Velocity = Speed = Acceleration = Displacement = Newton’s First Law 1.) How could you describe the forces acting on this vehicle? 2.) Calculate the resultant force. 3.) If the forces were equal what will happen to the motion of the object? Newton’s Third Law What is Newton’s third law as a simple definition? State the action-reaction pairs for someone sat on a chair How does Newton’s third law allow rockets to fly? Newton’s Second Law – Using F = ma complete the table a b c d e Force (Newtons, N) 200 840 5000 Mass (kilograms, kg) 20 7.0 0.40 Acceleration (meters/second squared, m/s2) 0.80 5.0 6.0 0.20 Calculating momentum Momentum is a measure of the tendency of an object to …………….. moving. Momentum of an object depends upon its ………………… and ………………………… It can be calculated using the equation: ____ = ______ x _____ The unit for momentum is __________ Stopping Distance Write a list of all the factors that would effect thinking and breaking distances Thinking distance Breaking distance Mass and Weight What is the difference between mass and weight? What is the equation for weight? If Sam with a mass of 54kg went to the moon, where gravity is about 1.6N/Kg, what would his weight be?

CP2 – Forces & Motion (p145-155) Velocity-time graph QUESTIONS Q1) speed = distance ÷ time Q2) A = accelerating; B = constant speed; C = accelerating; D = decelerating Q3) 12/3 = 4m/s2 Q4) 102.5m Define the following: Vector = a quantity having direction as well as magnitude Velocity = the speed of an object in a given direction Speed = the distance covered in a specific time Acceleration = rate of change in velocity over a period of time Displacement = the distance an object has travelled in a straight line Newton’s First Law 1.) unbalanced 2.) 1500N 3.) continue at a constant speed, or remain stationary if it was not already in motion Newton’s Third Law For every action there is an equal and opposite reaction The force exerted by the person on the chair; the force exerted by the chair on the person The action of ejected gases pushed from rocket causes an equal and opposite reaction force pushing the rocket forwards Newton’s Second Law – Using F = ma complete the table a b c d e Force (Newtons, N) 16 200 840 2.4 5000 Mass (kilograms, kg) 20 40 7.0 0.4 25000 Acceleration (meters/second squared, m/s2) 0.80 5.0 120 6.0 0.20 Calculating momentum Momentum is a measure of the tendency of an object to stop moving. Momentum of an object depends upon its mass and velocity It can be calculated using the equation: P = m x v The unit for momentum is kg m/s Stopping Distance Write a list of all the factors that would effect thinking and breaking distances Thinking distance Braking distance caffeine Wear of brakes/tyres Tiredness Mass of the car (luggage + passengers Alcohol Road surface Drugs Weather Mass and Weight Mass is the amount of matter in an object; weight is dependent on gravity acting on mass W = m x g 86.4N