Newton's First and Second Law

When forces are applied in different directions, which way will the object move?

• In the direction of the smaller force.

• The object won't move.

• In the direction of the larger force.

• To the side with the most mass.

Which direction will the soccer ball move?

• To the right

• To the left

• Straight up

• It won't move

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What is the net force in this image?

• 50 N

• 200 N

• 1.7 N

• 125 N

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NGSS.MS-PS2-1

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Objects with greater _____ also have more inertia.

• Speed

• Temperature

• Mass

• Friction

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What is net force?

• The force being applied to the left.

• The total of all forces acting upon an object.

• A push or pull.

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The greater the mass of an object is, the greater its inertia, and the greater the force required to change its motion.

• False

• True

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NGSS.MS-PS2-2

What does Newton's first law state?

• A characteristic of a moving object that is related to the mass and the velocity of the object.

• If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposition direction on the first object.

• Acceleration depends on the objects mass and on the net force acting on the object.

• An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.

Newton's first law of motion is also known as the law of inertia.

• True

• False

Inertia is the tendency of an object to resist a change in motion.

• False

• True

A speedboat pulls a 60-kg water skier. The net force that causes the acceleration is 180 N. Thus, the acceleration is 3.0 m/s².

(Hint: Acceleration=Net Force / Mass)

• False

• True

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