10 HOTS Multiple Choice – Simple Machines (Levers)

A board is used as a seesaw. A load of 60 N is placed 0.5 m from the fulcrum. If a child wants to balance the load by applying a force of 30 N, at what distance should the child sit from the fulcrum?

• 0.3 m

• 0.5 m

• 1 m

• 2 m

Ani places a stone of 80 N at a distance of 0.25 m from the fulcrum. She wants to lift the stone using only a 20 N effort. What effort arm length is required?

• 0.5 m

• 1 m

• 2 m

• 4 m

A lever is balanced when F × 0.6 m = 40 N × 0.3 m. If the load is increased to 50 N, to keep the lever balanced Ani must change the effort to what value?

• 15 N

• 20 N

• 25 N

• 30 N

Budi moves the load closer to the fulcrum so it is easier to lift. This causes which change?

• The effort arm becomes longer

• The required effort becomes larger

• The load arm becomes shorter

• The fulcrum changes position

For a lever, 25 N × 0.8 m = W × 0.4 m. If the load position is moved to 0.5 m, the effort needed to keep the lever balanced is approximately what value?

• 20 N

• 25 N

• 30 N

• 40 N

A lever is used to pull out a nail. If the effort arm is made twice as long, what happens?

• The required effort becomes twice as large

• The required effort becomes half as large

• The load becomes lighter

• The fulcrum also becomes longer

A lever is used to lift a 100 N load. If the load arm is 0.25 m and the effort arm is 1 m, which statement is correct?

• The required effort is 100 N

• The required effort is 50 N

• The required effort is 25 N

• It cannot be lifted

In an experiment, students vary the length of the effort arm to reduce required effort. From the results, the smallest effort occurs under which condition?

• The effort arm is shortest

• The load arm is longest

• The effort arm is longest

• The load is heaviest

For a lever, a 120 N load is 0.2 m from the fulcrum. If a student wants to lift it with an effort of only 30 N, what is the minimum effort arm length required?

• 0.4 m

• 0.6 m

• 0.8 m

• 1 m

Rina placed the load too far from the fulcrum so a very large effort is required. What is the best solution to reduce the required effort?

• Move the load even farther

• Shorten the effort arm

• Move the load closer to the fulcrum

• Increase the load’s weight