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May the Force Be With You! May the Force Be Qith You! What is a force? • Force: A push or a pull that acts on an object What different types of forces can you think of? Forces can be categorized: a)Contact Forces: affect things they touch – Tension – force in a wire or rope when pulled. – Friction – slows down motion by rubbing. – Elastic – spring-like object restores itself to its normal shape after alteration. b) Action at A distance Forces: affect things without touching them – Gravitation – attraction between masses. – Electrostatic – force between charged objects. – Magnetic – A field that acts on certain metals. MASS vs WEIGHT • MASS: – the amount of matter in a substance • WEIGHT: – It is the FORCE on an object due to gravity! – Weight = mass x gravity – Measured in Newtons (N) Would you have the same WEIGHT on the Earth as on another planet? W= m x g • Gravity on Earth = 9.81 N/kg • My mass= 80kg • W= m x g • W= 80 kg x 9.81 N/kg =784.8 N • Gravity on the Moon= 1.6 N/kg • Gravity on Jupiter = 27 N/kg Weight = mass x gravity • Increasing the GRAVITY causes an Increase in weight and vice versa DIRECT RELATIONSHIP • The force of WEIGHT is directly related to both mass and gravity!!