Forces & Newton's Laws

A book lying on your desk will only move if:

• An unbalanced force acts on it

• A downward force acts on it

• A normal force acts on it

• A friction force on it is reduced

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NGSS.MS-PS2-2

Newton's first law of motion is sometimes called the law of

• Intertia

• Momentum

• Conservation

• Resistance

Consider two rocks with masses of 1 and 10 kilograms. What is the relation between their inertia, masses and weights on earth?

• The inertia, mass, and weight of the 10 kg rock are 10 times greater than those of the 1 kg rock.

• The inertia, mass, and weight of the 10 kg rock are the same as those of the 1 kg rock.

• The inertia, mass, and weight of the 10 kg rock are 10 times lighter than those of the 1 kg rock.

• The inertia, mass and weight of the 1 kg rock are 10 times greater than those of the 10 kg rock.

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NGSS.MS-PS2-4

How is the mass of passengers in a car related to their inertia?

• Passengers with less mass have more inertia

• The inertia decreases with each passenger that enters the car

• Passengers with greater masses have more inertia

• Passengers with medium mass have more inertia.

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NGSS.MS-PS2-2

An object feels two forces. One force has a magnitude of 120 N pulling to the left and the second force has a magnitude of 80 N pulling to the right. If the object's mass is 50 kg, what is its acceleration?

• 
  

  $0.8\ \frac{m}{s^2}$ to the right

• $0.8\ \frac{m}{s^2}$ to the left

• not enough information to calculate

• no movement; forces are balanced

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NGSS.MS-PS2-2

A soccer ball with a mass of 2.10 kg accelerates at 253

 $\frac{m}{s^2}$  the instant it is kicked.  Determine the force applied by the player.  

• 120.5 N

• 531.3 N

• 0.0083 N

• 0 N, the only force is the force of gravity

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NGSS.MS-PS2-2

If the box in the diagram has a mass of 50kg, what will be the acceleration it experiences and in which direction?

• $500\ \frac{m}{s^2}\ upward$

• $250\ \frac{m}{s^{2\ }}\ to\ the\ right$

• $700\ \frac{m}{s^2}downward$

• $0\ \frac{m}{s^2};\ no\ direction$

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NGSS.MS-PS2-2

The graph above shows the different velocities experienced by a car on a drive to work one day. If a force of 2000 N was applied to the car, and assuming no other forces were between point 0 and point A, what is the mass of the car?

• 500 kg

• 133.33 kg

• 33.33 kg

• 120,000 kg

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NGSS.MS-PS2-2

According to Newton's 3rd law of motion, compare the forces experienced by a bug and a car when the bug hits the windshield of the car while the car is moving forward.

• The bug experiences a greater force than the windshield

• The windshield and the bug experience equal forces

• The windshield experiences a greater force than the bug

• The bug and the windshield experience unbalanced forces

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NGSS.MS-PS2-1

The graph shows the weight of 3 objects on the moon as a function of their mass. The acceleration due to gravity on the moon is approximately 1.6 m/s² . A fourth object was found to have a weight of 144 N. What would be the mass of this object?

• 144 kg, because mass and weight are the same on the moon.

• 115 kg, due to the low acceleration of gravity on the moon.

• 90 kg, due to the low acceleration of gravity on the moon

• 0 kg, because objects are weightless on the moon.

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