Science Challenge

What is the flow of electric charge called?

• electric current

• electricity flow

• power movement

• charge stream

Name the unit used to measure electric current.

• Ohms

• Watts

• Volts

• Amperes (A)

What is the SI unit of electric potential difference?

• joule

• volt

• ohm

• ampere

Define resistance in an electrical circuit.

• Resistance in an electrical circuit is the opposition to the flow of current.

• Resistance in an electrical circuit is the speed of current flow.

• Resistance in an electrical circuit is the absence of current flow.

• Resistance in an electrical circuit is the facilitation of current flow.

What type of simple machine is a seesaw?

• pulley

• wheel

• lever

• screw

Which simple machine is used to lift heavy objects?

• Screw

• Wheel and axle

• Pulley

• Lever

What is the purpose of a pulley?

• To play music

• To change the direction or magnitude of a force

• To increase the temperature of a room

• To cook food faster

Name the simple machine that consists of a wheel with a rope or chain around it.

• Gear

• Lever

• Screw

• Pulley

What is the mechanical advantage of an inclined plane?

• Height of incline / Length of incline

• Width of incline / Height of incline

• Weight of object / Force applied

• Length of incline / Height of incline

Explain how a lever works in terms of force and distance.

• A lever works by dividing the force applied through the distance from the pivot point.

• A lever works by reducing the force applied through the distance from the pivot point.

• A lever works by keeping the force constant regardless of the distance from the pivot point.

• A lever works by multiplying the force applied through the distance from the pivot point.