Lesson-3 Force Pairs

What is Newton's Third Law of Motion?

• an object at rest stays at rest, and an object in motion will stay in motion until an outside force acts upon it

• the acceleration of an object will be equal to the net force of an object divided by its mass

• for every action, there will be an equal and opposite reaction

• an object that is not moving will stay not moving moving until an unbalanced force acts on it

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If a bird hit your windshield on your car, the force of the car on the bird equals

• the force of the bird on your car.

• the force of the car on the brid

• an elastic collision on the windshield

• a noncontact force acting on the windshield

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Pick the best example of Newton’s third law of motion in action.

• a rock skipping across a lake

• An asteroid continuing to spin because nothing has exerted a force to stop it

• An asteroid moving around the Sun while being pulled toward the Sun

• A rocket accelerating in space as a result of gases and the rocket pushing each other in opposite directions

If you throw a ball into the air, Earth exerts a force on the ball. The ball in the air exerts no force on Earth.

• True; all forces act alone

• False; there will always be a force pair

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What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

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What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N 

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What is the unit to MEASURE force?

• Kilogram

• Meter

• Pounds

• Newton

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A ____________ is a push or a pull on an object.

• friction

• force

• magnet

• gravity

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If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

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Balanced or unbalanced?

• balanced
• unbalanced

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