8.6c

According to Newton’s first law of motion, an object that is moving will change its motion only if what kind of forces act on it?

• Constant forces

• Unbalanced forces

• Strong forces

• Gravitational forces

Tags

NGSS.MS-PS2-2

An object is moving to the right at a constant velocity. What will happen if a force of 20 N starts acting on it in the opposite direction?

• The object’s velocity will increase.

• The object’s velocity will decrease.

• The object will come to a stop.

• The object will move at the same velocity.

Tags

NGSS.MS-PS2-2

In which of the following situations would the force shown, acting on a sphere of the given mass, result in the greatest acceleration?

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• 
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Tags

NGSS.MS-PS2-2

A ball thrown into the air starts out with an initial upward velocity, but eventually slows and stops before falling back to the ground. Which of the following contributes the most to the change in motion of the ball?

• The initial force with which the ball is thrown

• The downward force of gravity

• The resistance against the atmosphere

• The increase of inertia

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Safety belts protect people in cars in the event of an accident because, according to Newton’s laws of motion, when an impact causes the car to suddenly change its motion -

• the people in the car will continue to move in the same direction and at the same speed as before the impact.

• the speed of the car always increases, giving it greater force since the mass will remain the same.

• the speed of the people always increases, since now they have not one but two forces acting on them.

• the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What amount of force needs to be applied to a 20-kg bowling ball to give it an acceleration of 5 m/s2?

• 4 N

• 25 N

• 100 N

• 250 N

Tags

NGSS.MS-PS2-2

Examine the table provided. Which of the objects is producing the greatest force? (Click the image to enlarge it)

• Basketball

• Football

• Racquetball

• Golf ball