Forces Review

In science, force refers to

• a moving object.

• the way objects interact.

• a push or pull on an object.

• a description of an objects movement.

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When do forces always occur?

• when two objects interact

• when two objects are in motion

• when one object is larger than another

• when two objects are of the same size

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Forces are described using

• speed and direction.

• motion and distance.

• strength and direction.

• strength and distance.

Which unit is used to measure the strength of forces?

• kilowatt (kW)

• megajoule (MJ)

• newton (N)

• pascal (Pa)

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Different strengths of forces can be modeled using

• arrows of different lengths.

• scales that measure different forces.

• a table of different numerical values.

• a graph of different numerical values.

Newton’s third law of motion states that when an object exerts a force on a second object, the second object

• exerts a weaker force in the opposite direction.

• exerts a stronger force in the opposite direction.

• exerts a force with equal strength in the same direction.

• exerts a force with equal strength in the opposite direction.

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In the example of a swimmer interacting with a wall, the swimmer

• exerts a force on the wall only.

• exerts no force on any object.

• exerts a force on herself only.

• exerts a force on both herself and the wall.

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The net force on an object is found by...(same direction)

• adding the forces.

• dividing the forces.

• subtracting the forces.

• multiplying the forces.

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The net force of forces 15 N and 30 N is ______. (in the same direction)

• 2 N

• 15N

• 45 N

• 450 N

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For forces acting in opposite directions, the net force is found by

• adding the forces.

• dividing the forces.

• subtracting the forces.

• multiplying the forces.

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