Laws of Motion

If a ball of cheese is fired into frictionless space, the amount of force needed to keep it going equals

• twice the force with which it was fired
• the same amount of force with which it was fired
• 1/2 the force with which it was fired
• zero, since no force is requires to keep it moving. 

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Which one needs a greater net force to move, a kilogram of feathers or a kilogram of iron? 

• feathers 
• iron
• same
• depends on their friction

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One object has twice as much mass as another object. The first object also has also twice as much...

• velocity
• gravitational acceleration
• inertia
• all of these

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A(n) __________ is a push or pull.

• newton
• acceleration
• force
• momentum

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When a large truck pushes a small car with a given force, the small car is applying an equal and opposite force on the truck.

• True
• False

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What is Newton's First Law known as? The Law of

• Friction
• Mass
• Inertia
• Gravity

Which has more Inertia? (so need more force to move) 

• Truck
• Ant
• A cat
• A skateboard

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What is required to lift a rocket off the ground?

• Upward forces that are balanced with gravity.

• Airplanes to lift up the rocket.

• This can't happen

• An upward force that is greater than Earth's gravity and air resistance.

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What is Newton's First Law

• F=ma
• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion. 
• Friction 

What is the unit of measurement for force?

• AMP
• Seconds
• Newtons
• Miles

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