Jiji 1 Forces

A contact force is any force that requires contact to occur. Which of the following best describes motion caused by a contact force?

• A toy car rolling down a ramp

• The paper clip being pulled up by a magnet

• An apple falling to the ground from a tree

• The wind blowing leaves across the ground

Based on the map, which area probably produces the most violent storm?

• Area 1

• Area 2

• Area 3

• Area 4

Which example shows an interaction between the hydrosphere and the geosphere?

• Ice from a glacier melts into the ocean

• Wind blows loose particles of sand into a dune

• Decomposers slowly turn a decaying log into soil

• Flowing river water deposits particles that eventually form sedimentary rocks

Forces acting on an object can be balanced or unbalanced. Which of the following is the best example of unbalanced forces acting on an object?

• A book sitting on a high shelf in the classroom.

• A ruler sitting on a desk without being touched.

• A ball speeding up as it rolls down in a straight line.

• An asteroid moving at a constant speed and direction through outer space.

A student designed an investigation to test the effect of car shape on wind resistance. She did this by comparing the speeds of four differently shaped cars rolling on the smooth level immediately after having rolled down the same ramp. All four cars had the same mass and the wheel structure.What was the test variable independent variable in the investigation?

• The speed of the car.

• The shape of the car.

• The length of the ramp.

• The height of the ramp.

Which point in the diagram with the greatest the position from the river occur?

• 1

• 2

• 3

• 4

Why are there significantly more thunderstorms in Florida than in California?

• The state of Florida is smaller than the state of California.

• The air in Florida is more stable than the air in California.

• The air in Florida is more stable than the air in California.

• The ocean currents near Florida are warmer than the ocean currents near California.

A hiker could find some smooth rounded pebbles along the shore of a stream that is flowing down from a mountain. Which of these most likely caused the pebbles to have this appearance?

• Heat from the sun

• Movement of water

• Change in temperature

• Chemicals in the environment

Which process causes hot water released by sea winds to rise and circulate the cold ocean water?

• Potential

• Radiation

• Convection

• Conduction

Which of the following best explains how the atmosphere helps keep earth insulated and warm?

• The atmosphere creates heat as earth moves through the space helping to insulate earth.

• The atmosphere traps the heat generated by earth's core and helps maintain earth's climate.

• That most sphere helps spread the warmth from the water near the equator to other parts of earth.

• The atmosphere helps trap heat energy from the sun and energy radiated from the earth to maintain the climate.