STS 2 PREPARATION

The correct formula for calculating work is ...

• W = F + s

• W = F x s

• W = F/s

• W = s/F

The SI unit of work is ...

• Joule

• Newton

• meter

• Watt

Answer explanation

A student lift a bottle with force of 100 N to a height of 1,5 meters. The amount of work done is ...

• 1,5 J

• 15 J

• 150 J

• 1500 J

1. A box is pushed with a force of 40 N across 5 meters, but due to friction, it only moves 3 meters. The work done on the box is:

• 120 J

• 150 J

• 200 J

• 250 J

Two force, act on an object is shown by the picture. If the box move to the right 2 meters, the work done on the object is ...

• 800 J

• 600 J

• 400 J

• 200 J

Which statements are TRUE?(pick 2)

• Energy can be destroyed

• Energy can not be destroyed

• Energy can be created

• Energy can not be created

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed 
• Energy cannot be created or destroyed, it can only transformed
• Energy can't be created, destroyed or transformed

The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

• mechanical to heat

• sound to mechanical

• potential to kinetic

• kinetic to potential

A wind turbine converts energy as follows:

• Electrical → Kinetic

• Kinetic → Electrical

• Chemical → Nuclear

• Sound → Light

1. A radio consumes 1200 J of electrical energy in 4 minutes. The power of the radio is:

• 5 Watt

• 10 Watt

• 50 Watt

• 300 Watt