#12 Simple Machine Practice
1. A 6.0 m board is used as a lever. The fulcrum is placed 1.0 m from where the load is placed at one end. Find…
a. IMA
b. The force that should be needed to lift a 2.3 kg load
2. A broom is held so that the top hand is 150.0 cm from the brush end. The lower hand is place 30.0 cm below the top hand. If the top hand is the fulcrum find…
a. IMA
b. If the lower hand exerts 4.6 N of force how much force should the broom push on the dust.
3. When using a simple machine the object is moved 6.40 m every time you move your hand 80.0 m to put work into the machine.
a. What is the IMA?
b. Assuming the machine is ideal how much force must you put into the machine to get 60.0 N out of it?
c. If you need to use 124 N of force to get 310 N out of it what is the AMA?
d. How efficient is this machine?
4. 234 J of work is put into a machine in order to get 152 J of work out. What is the efficiency of the machine?
5. You must pull down 12.0 m on a pulley system to lift a 34 kg mass 2.0 m using 64 N of force. Find the IMA, AMA, and Efficiency of the system.
6. Due to friction the efficiency of board used as an inclined plane to lift a 450 kg box is only 43%. If it is 10.0 m long and is used to raise the box 1.6 m with how much force must you push the box?
7. A car jack raises a car 6.0 mm every time the jack handle is moved 1.2 meters. If it is only 26% efficient find IMA, AMA and the force needed to lift a 1,600 kg car.
8. In the pulley system below a 10.0 N force is needed to lift a 34.5 N load, find…
a. IMA
b. AMA
c. Efficiency
9. Given the pulley system below:
a. Find IMA
b. If the bike has a mass of 12.5 kg how much force would you ideally need to lift it?
c. If the system is 78% efficient what is the AMA?
d. At 78% efficiency how much force is needed to lift the bike?