Technology (Grade 7) Mechanical systems and Control

1. What is a lever?

• 1. A) A type of wheel

• 2. B) A simple machine used to lift or move objects

• 1. C) A device to create electrical currents

1. What is the purpose of a pulley?

• 1. A) To reduce the speed of an object

• 1. B) To lift or lower heavy objects with less effort

• C) To conduct electricity

1. What is mechanical advantage?

• 1. A) The power generated by a motor

• 1. B) The increase in force achieved by using a machine

• 1. C) A decrease in weight

1. Which of these is NOT a simple machine?

• 1. • A) Lever

• 1. B) Pulley

• 1. • C) Circuit

1. How does a gear system affect speed?

• 1. A) Increases speed

• 1. B) Decreases speed

• 1. • C) Can increase or decrease speed depending on the gear size

Fill in the blank: A (a)   is a simple machine made up of a wheel with a rope that makes it easier to lift heavy objects.

Which simple machine is used to split objects apart?

• A) Pulley

• • B) Lever

• • C) Wheel

• D) Wedge

In a pulley system, adding more pulleys will:

• • A) Increase the force needed

• • B) Decrease the force needed

• • C) Make no difference

• • D) Only increase the height

Which of these is an example of a first-class lever?

• A) A wheelbarrow

• • B) A pair of scissors

• • C) A fishing rod

• • D) A ramp

A system that reduces the amount of effort needed to do work is called a (a)   system.