Review for Physics QZ 10.1-10.2

Energy of motion is called ___.

• kinetic energy

• potential energy

• power

• work

Answer explanation

The correct answer is kinetic energy, which is the energy of motion.

Power is measured in ___.

• joules

• newtons

• ohms

• watts

Answer explanation

Power is measured in watts, which is the correct choice among the given options.

The work-energy theorem states that when work is done on an object, the result is a change in ___.

• energy

• velocity

• power

• work-energy

Answer explanation

The work-energy theorem states that when work is done on an object, the result is a change in energy.

If the velocity of a moving car is doubled, its kinetic energy will be ___.

• halved

• doubled

• tripled

• quadrupled

A worker exerts 45 W of power while lifting a 10.0 N box to a height of 1.0 m. How long does this take?

• 35 s

• 4.5 s

• 0.22 s

• 0.02 s

The equation GPE = mgh represents ___.

• elastic potential energy

• gravitational potential energy

• potential energy

• rotational potential energy

Answer explanation

The equation GPE = mgh represents gravitational potential energy.

The height to which an object has risen is determined by using a reference level, the position where GPE is defined to be ___.

• 0 J

• 1 J

• 2 J

• 3 J

Answer explanation

The correct reference level for GPE is 0 J, as the object's height is measured from this point.

You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required?

• 39 W

• 41 W

• 43 W

• 45 W

Calculate the kinetic energy (KE) of a runner that has a mass of 80.0 kg and is running at a velocity of 8.00 m/s

• 5120 J
• 320. J

• 640. J

• 2560 J

50.0 J of work is done lifting a 20.0 N book in the air. How high was it lifted?

• 2.50 m

• 3.50 m

• 0.400 m

• 25.0 m