Physics Quiz

According to the ancient Greeks, why does smoke rise from a campfire?

• Smoke experiences retrograde motion.

• Smoke’s nature is to move upward.

• Smoke wanders.

• The warm air associated with smoke is less dense.

The formula s = d/t is used for calculating _________.

• average speed

• displacement

• instantaneous speed

• velocity

Which of the following is a contact force?

• electric force

• friction force

• gravitational force

• magnetic force

Which object remains in its current state unless acted upon by a net external force?

• an object at rest

• an object in motion

• an object with constant velocity

• all the above

Driving a car 100 m requires the same amount of _________ as pushing it 100 m by hand.

• power

• power and energy

• time

• work

We use simple machines in order to

• increase energy output.

• decrease the amount of work we do.

• make work easier to do.

• do all the above.

In a second-class lever,

• the fulcrum is between the input force and the output force.

• the input force and fulcrum are in the same location.

• the input force is between the fulcrum and the output force.

• the output force is between the input force and the fulcrum.

Using a first-class lever to move a rock, you exert 25 N of force to move the lever 3.0 m. If you are using a lever with an IMA of 4.3, how far is the rock lifted?

• 0.70 m

• 5.8 m

• 8.3 m

• 12.9 m

You use 500 N of force to push a cabinet that weighs 1875 N up to the top of the ramp. How much work did you do?

• 2000 J

• 7500 J

• 9000 J

• 33 750 J

Which temperature scale currently uses the boiling point of water as a fiduciary point?

• Celsius

• Fahrenheit

• Kelvin

• All the above use the boiling point as a fiduciary point.