7A Chapter 11 & 12 Gravity, Force & Work

Master gravity, force, work, and simple machines! Fun 7th-grade science practice.

What is the force that attracts masses together? Love Gravity Weight Friction When you push a stroller with a baby in it, what type of friction is opposing the motion? Opposing friction Inertia centripetal force Rolling friction Centripetal force always points toward the _ of the circular path of motion. center direction of the object outside The force of Gravity decreases as the distance between the masses _. increases decreases remains the same When the force of Air Resistance equals the force of Gravity, a falling object reaches _ velocity. net mass equilibrium terminal So you drop your textbook with a force of 2 newtons(N)a distance of 1 meter (m) to the floor. Calculate how much wok was done.work = force x distance .5 1 2 2 joules (remember to always use units!!!!) The pivot point on a lever is called a _ . fulcrum epicenter triangle wedge The workbook reviews 6 Simple Machines, they are;Sorry guys this one was not in the knowledge check, you'll have to go back and look at chapter 12. ball and ramp, lever and fulcrum, wheel and axle. Pulley, Gear, Wheel, Ramp, Inclined Plane and Screw Wedge, Wheel, Axle, Gear, Screw, Pulley Inclined Plane, Wedge, Screw, Lever, Wheel Axle, and Pulley If you use a ramp (an inclined plane) to load a fridge into a moving truck, what happens to the amount of work you are doing? You increase the amount of work over a longer distance. You decrease the amount of work over a longer distance. You use the same amount of work over a longer distance. What is a compound machine? multiple simple machines working together a simple machine that compounds (multiples) the work a wheel and axle