Review Test Semester 1

Which of the following is not a scientific question?

• Why do roller coaster travel faster down taller hills?

• What caused the extinction of the dinosaurs?

• How can we get more energy from the sun?

• Who is the greatest scientist known to history?

Johannes Kepler's laws of planetary motion most influenced —

A.

Newton's law of gravitation

B.

Galileo's discovery of the Jovian moons

C.

Copernicus' heliocentric model of the solar system

D.

Cavendish's determination of the gravitational constant

• Cavendish gravitational constant

• Newton's law of gravitation

• Copernicus' heliocentric model of the solar system.

• Galileo's discovery of the Jovian moons.

A student reads several news articles about wind power, nuclear plants, and solar energy. Each article states alternative energy sources are needed because -

• the supply of fossil fuel is diminishing

• there is no limit to the supply of fossil fuels

• the energy needs of the world are decreasing

• the population of the world is decresing

Which of the following statements is an example of a hypothesis?

• If the length of a pendulum increases, the period of the pendulum will increase.

• If the length of a pendulum increases, the period of the pendulum will increase.

• Based on this study, children who attend preschool have better grades in elementary school.

• All living things are composed of cells

The diagram below shows a pendulum at two different positions in its path. The pendulum started from rest at position A.

What best describes the change in energy as the pendulum moves from A to B?

• The potential energy is increasing.

• The thermal energy is decreasing.

• The kinetic energy is increasing.

• The total energy is decreasing.

A 64-kg skateboarder on a 2.0-kg skateboard is on top of a ramp with a vertical height of 5.0 m. Which of the following is closest to the skateboarder's maximum kinetic energy at the bottom of the ramp?

• 1750 J

• 6125 J

• 12,250 J

• 24,500 J

Which of the following situations is an example of kinetic energy being transformed into potential energy?

• Throwing a ball high into the air

• Dropping a ball from a ladder

• Rolling a ball on the ground

• Holding a ball in the air without moving it

Calculate the potential energy of a 6 kg bowling ball suspended 3 m above the surface of the Earth.

• 0.2 J

• 2 J

• 18 J

• 176.4 J

The work-energy theorem indicates which of the following?

• The work done is equal to the total potential energy.

• The work done is equal to the total kinetic energy.

• The work done is equal to the change in potential energy.

• The work done is equal to the change in kinetic energy.

A ball is swinging at a constant speed in a horizontal circle on the top of a level lab table. Which of the following is the direction of the velocity of the ball?

• Inward along the radius.

  B.

• Outward along the radius.

  C.

• Tangent to the circle, in the direction of motion.

• Along the circumference of the circle, in the direction of motion.