Physical Science B - Accommodated Final
1) A gardener moves 5 kilograms bag of soil at an average acceleration rate of 4 m/s to her flower bed, a distance of 5 meters. How much work does the gardener do? Equations - Work = Force x Distance, Force = mass x acceleration
a. 100 n
b.22n
2) It takes 1000 N of force to lift a go kart onto a work table. If the mechanic uses a pulley with a mechanical advantage of 4 to lift the kart, how much force is needed?
a.4000 n
b.250 n
3) What is the advantage of class 3 lever?
a. It increases the distance over which a force needs to be applied
b. It decreases the distance over which a force needs to be applied
4) One end of the lever is pushed down 2 meters to lift a heavy bag up to a surface 1 meter off the ground. If it takes 1000 N of force to lift the bag directly, what amount of force is needed to lift it with the lever?
a. 500 n
b. 2000 n
5) A team of students builds a lever as a science project. They expend 100 Joules of energy to lift some bricks with the lever. If 60 Joules of energy are applied to the bricks, what is the lever’s efficiency?
a. 160%
b. 60%