Science Exam Practice (Systems in Action)

Which of the following is not a contact force?

• Spring Forces

• Frictional Forces

• Air Resistance Forces

• Static Forces

The best way to reduce friction is to add a...

Which force depends on the force of gravity?

• Mass

• Weight

• Magnetism

• Static electricity

(Work output ÷ Work input) x 100% This equation is used to find...

Which of these are part of the criteria to evaluate a system

• Efficiency

• Safety

• Quality

• Cost

• Automation

What is productivity?

• The amount by which a machine can multiply the input force

• The amount by which a machine can multiply the output force

• How well a machine can work

• The amount of output that is produced per unit of time

Wei uses a pulley system to lift a box. She pulls the rope a distance of 3m, using a force of 50N. If work done on the box is 120J, what is the efficiency of the pulley system?

Which classes of lever(s) are the input force and the output force in the same direction? Answer like this: 5th class and 4th class (not the correct answer)

What is not a way in which a machine makes work easier?

• Increasing the distance

• Increasing the force

• Increasing the energy

• Changing the direction

What class of lever is this diving board?

• 1st class

• 2nd class

• Double class

• 3rd class