A skateboarder is gliding at 5.5 m/s and has a mass of 70.0 kg. What is the skateboarder’s momentum?

• 385 kg m/s

• 14.0 kg m/s

• 5.2 kg m/s

• 77.0 kg m/s

Tags

NGSS.HS-PS2-2

Hydroelectric and wind energies are both indirect forms of _______ energy.

• solar

• kinetic

• potential

• geothermal

Tags

NGSS.HS-PS3-3

The SI unit of power is the

• Joule.

• Newton.

• Newton-meter.

• watt.

A machine is classified as a compound machine if it

• Has moving parts.

• Has an IMA greater than 1.

• Is made up of two or more simple machines.

• Is very efficient.

According to Newton's second law of motion, the force acting on an object equals the mass of the object times

• the acceleration of the object

• the momentum of the object

• the velocity of the object

• the weight of the object

Tags

NGSS.HS-PS2-1

Potential energy that depends on an object's height is called _______ potential energy.

• kinetic

• elastic

• gravitational

• chemical

Thermal energy depends on what three factors?

• spring constant, configuration, and phase

• change in temperature, buoyant force, and nuclear energy

• mass, change in temperature and heat capacity

• length, heat capacity, and shape

When an unbalanced force acts on an object,

• the object's motion does not change.

• the object accelerates.

• the weight of the object decreases.

• the inertia of the object increases.

Tags

NGSS.HS-PS2-1

One kilometer equals 1000 m. What does the prefix kilo- mean?

• 10

• 100

• 1000

• 10,000

What was the purpose of the diode in the charging circuit for our electric cars?

• it allowed current to go in both directions so excess voltage in the charged battery can ‘drain out’

• it only allowed current to go in one direction so the voltage in the charged battery does not ‘drain out’

• it kept the circuit cool

• it increased the voltage