9th Contact Force Quiz

Which scenario best demonstrates an example of Newton's first law of motion?

• A shopping cart accelerates when it is pushed.

• A rocket lifts off from a launch pad.

• A car passenger moves forward when a car suddenly stops.

• A man pushes a canoe off the shore and into the water.

Answer explanation

A car passenger moves forward when a car suddenly stops, illustrating Newton's first law: an object in motion stays in motion unless acted upon by an external force. The passenger's inertia causes them to lurch forward.

The table shows the acceleration due to gravity on four different planets. What planet is a person standing on if the person has a mass of 85.0 kg and weighs 305 N?

• Mars

• Mercury

• Venus

• Earth

Answer explanation

To find the planet, use the formula: weight = mass × gravity. Given weight (305 N) and mass (85.0 kg), gravity = 305 N / 85.0 kg = 3.59 m/s². This matches Mercury's gravity, confirming the person is on Mercury.

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Which object has a mass of 15 grams?

• V

• W

• X

• Y

Answer explanation

Object Y has a mass of 15 grams, making it the correct choice among the options provided. The other objects V, W, and X do not have this mass.

What is the mass of object Z?

• 7 grams

• 9 grams

• 11 grams

• 13 grams

Answer explanation

The mass of object Z is 9 grams, as it is the only option that fits the criteria provided in the question. The other choices, 7 grams, 11 grams, and 13 grams, do not match the correct answer.

Which object has the smallest mass?

• V

• W

• X

• Z

Answer explanation

Object V has the smallest mass among the options provided. This conclusion is based on a comparison of the mass values associated with each object.

Which object would require the least amount of force to move?

• A. V

• B. W

• C. Y

• D. Z

Answer explanation

Object V requires the least amount of force to move, likely due to its lighter weight or lower friction compared to the other options. Thus, it is the easiest to move.

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Which explanation BEST supports Newton's second law of motion which states that force = mass x acceleration?

• A. Object Y will accelerate the fastest because it has the largest mass.

• B. Object V will accelerate the slowest because it has the smallest mass.

• C. Object Y will require the most force to move because it has the largest mass.

• D. Object V will require the most force to move because it has the smallest mass.

Answer explanation

Choice C best supports Newton's second law because it correctly states that a larger mass (Object Y) requires more force to achieve acceleration, aligning with the formula: force = mass x acceleration.

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The drawings show four objects that are acted upon by different forces. The arrows represent the forces' direction, and the forces' units are in newtons (N). Based on Newton's law of inertia, which object is moving at a steady speed, assuming that all four objects are moving on a frictionless surface?

• Object 1

• Object 2

• Object 3

• Object 4

Answer explanation

Object 4 is moving at a steady speed because it is not acted upon by any net force, according to Newton's law of inertia. This means it maintains its state of motion on a frictionless surface.

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Which car traveled the greatest distance in the shortest time according to the graph?

• Car A

• Car B

• Car C

• Car D

Answer explanation

Car A traveled the greatest distance in the shortest time, as indicated by its steepest slope on the graph, representing the highest speed compared to the other cars.

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Which car had the slowest speed according to the graph?

• Car A

• Car B

• Car C

• Car D

Answer explanation

According to the graph, Car C had the lowest speed compared to the other cars. This is evident as its speed value is the least among Car A, Car B, and Car D, confirming that Car C is the correct answer.

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