Year 9 Physics end of year revision

An electric current flowing in one direction is known as a/an

• direct current

• alternating current

• straight line

• I do not know and do not wish to guess.

Click all of the things that are non-renewable energy sources.

• oil

• gas

• nuclear

• biomass

How do you calculate power?

• power = work done

• power = energy transferred / time taken

• power = work done x time taken

• power = energy transferred x time taken

The SI unit for power is...?

• Watts
• Joules
• Newtons
• Meters

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

• Faster at the bottom of the steeper hill

• Faster at the bottom of the less steep hill

• Same speed at the bottom of both hills

• Can’t say without knowing the mass of the marble

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Which of the following statements is true according to the law of conservation of energy?

• Energy cannot be created.

• Energy cannot be destroyed.

• Energy can be converted from one form to another.

• all of these

How will you describe the energy at Point A?

• mostly gravitational potential energy

• mostly kinetic energy

• losing gravitational potential energy, gaining kinetic energy

• losing kinetic energy, gaining gravitational potential energy

A 735kg empty roller coaster is at its starting point whose distance from the ground is 150m. After a while, it moves at point B whose distance from the ground is 120m. What is the kinetic energy of the coaster at point B?

• 1,080,450J

• 864,360J

• 216,090J

• 0J

Tags

NGSS.HS-PS3-1

The SI unit for charge flow is...?

• watts

• joules

• ohms

• coulombs

What is the efficiency of the machine if the input (energy consumed) is 263 J and the output (useful energy) is 142 J?

• 6.26%

• 54%

• 100%

• 260%

Tags

NGSS.HS-PS3-3