Forces and Light

Which of the following sentences about friction is NOT correct?

• Friction can make an object get hotter.
• Friction wears car tyres away.
• Friction slows down a ball rolling in grass.
• Friction can speed up a falling object.

What unit do we use to measure mass?

• grams

• kilometers

• Newtons

• litres

The mass of an object is 30 g.  The volume is 5 cm³.  

What is the density of this object?

• 6 g/cm³

• 6 g/mL
• 6 ml

• 6 g

Why do some substances float on water?

• they are warmer than water
• they are cooler than water
• they are more dense than water
• they are less dense than water

What is the equation to calculate speed?

• speed = distance/time

• speed = time x distance

• speed = time/distance

• speed = speed/time

What is the best description of a transparent material?

• no light passes through the material

• some light passes through the material

• all light passes through the material

What can you use to see all the different colors in white light?

• A flashlight

• A shadow

• A camera

• A prism

Which of the following is the correct order in which light travels through the eye?  

• Cornea, Lens, Retina, Pupil, Optic Nerve
• Pupil, Cornea, Lens, Retina, Optic Nerve
• Cornea, Retina, Lens, Pupil, Optic Nerve
• Cornea, Pupil, Lens, Retina, Optic Nerve

For clear vision, an image must be focused exactly on the ________________.

• retina
• pupil
• optic nerve
• lens

Which represents a concave lens?

• A

• B

• A and B

• neither A or B