QCAA Physics Unit 3

Which list contains only vector quantities?

• Weight, velocity, acceleration

• acceleration, force, speed

• charge, momentum, impulse

• colour charge, electric field, force

A bowling ball is rolled off the edge of a building. At the exact moment the bowling ball dropped off the edge of the building, a basketball was dropped straight down from the same height. Assuming air resistance is negligible.

Select the statement that is true:

• The bowling ball will land before the basketball.

• The basketball and the bowling ball travel the same

  horizontal distance as they fall.

• The basketball and the bowling ball will reach the same velocity just before they land.

• The basketball and the bowling ball will reach the same vertical velocity just before they

  land.

Calculate the mass of an object that weighs 528 𝑁 on a planet where g = 1.6 m/s/s

• 0.003 N

• 330 Kg

• 330 N

• 0.003 Kg

Select the true statement about an object in uniform circular motion:

• Uniform circular motion is caused by a centrifugal force acting on the object

• A free body diagram of an object in uniform circular motion shows a centripetal force acting inward and a centrifugal force acting outward.

• A free body diagram of an object in uniform circular motion shows a centripetal force

  acting outward and a centrifugal force acting inward.

• The centripetal force is the net force acting on an object in uniform circular motion.

Select the true statement:

• The gravitational constant, G is the same regardless of which planet you are on.

• Acceleration due to gravity, g is the same regardless of which planet you are on.

• Acceleration due to gravity, G is the same regardless of which planet you are on.

• The gravitational constant, g is the same regardless of which planet you are on.

If the mass of the moon was doubled,

• the gravitational force of the moon on the Earth would double, but the gravitational force of the Earth on the moon would remain the same.

• the gravitational force of the Earth on the moon would double, but the gravitational force of the moon on the Earth would remain the same.

• Both the gravitational force of the Earth on the moon and the gravitational force of the moon on the Earth would double.

• Both the gravitational force of the Earth on the moon and the gravitational force of themoon on the Earth would remain the same

If the distance between the Sun and the planet Mars was doubled,

• the gravitational force of the Sun on Mars would be unchanged.

• the gravitational force of the Sun on Mars would reduce by a factor of 2.

• the gravitational force of the Sun on Mars would reduce by a factor of 4.

• the gravitational force of the Sun on Mars would be squared.

If the mass of a satellite doubles, and its speed remains unchanged, the radius of its orbit

• Doubles

• halves

• squares

• remains the same

Electromagnetic radiation is

• radiant vacuums consisting of synchronised oscillations of electric and magnetic fields, or electromagnetic waves, propagated at the speed of light in an energy field

• radiant magnets consisting of synchronised oscillations of electric and magnetic fields, or electromagnetic waves, propagated at the speed of light in a vacuum

• radiant energy consisting of synchronised oscillations of electric and magnetic fields, or electromagnetic waves, propagated at the speed of light in a vacuum

• radiant electricity consisting of synchronised oscillations of electric and magnetic fields, or electromagnetic waves, propagated at the speed of light in a vacuum

An electron moving through a vacuum with a constant velocity

• creates neither an electric field nor a magnetic field

• creates an electric field but no magnetic field

• creates a magnetic field but no electric field

• creates both an electric field and a magnetic field