What direction is the force that the driver exerts on the car? backwards What force is required to accelerate an object of 3kg at 2m/s2? Your answer should include: 6N / 6 What is the weight of an object of mass 15kg on the Earth (gravitational field strength 9.81 N/kg)? Your answer should include: 147.15N / 147.15 What is the mass of an object that weighs 70N on the moon, where the gravitational field strength is 1.6N/kg? Your answer should include: 43.75kg / 43.75 Terminal VelocityĪs an object falls, it’s speed changes due to the changing forces acting on it.Īt first the weight is greater than the air resistance and so the sky-diver speeds up. What direction is the force that the car exerts on the driver? forwards A car accelerates forwards. F = maĬalculate the resultant force on an object of mass 6kg when it has an acceleration of 3m/s 2Ī car accelerates forwards. Newton’s 2nd law is often represented by an equation (you DO need to remember this equation in your exam). Or, to achieve equal acceleration a greater force will be needed for the truck due to its larger mass. The acceleration of an object is directly proportional to the force acting on it, and inversely proportional to it’s mass.įor example, if the same force is applied to these vehicles, the motorbike will accelerate faster due to its smaller mass. Newton’s 2nd law applies to objects that have a resultant force acting on them (and so their motion is changing) G = gravity (N/kg) Newton’s 2nd Law of Motion The relationship between mass, weight and gravity is described in this equation (you DO need to remember this for your exam): W = mg However, his weight is different in those locations because of the different gravitational field strength. Gravity – The force of attraction between objectsįor example, the mass of an astronaut is the same whether on the Earth, the moon or in outer space because there is the same amount of matter in the body of the astronaut.
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