Newton's Laws and Weight

What is the net force acting on a 1.0 kg object moving at a constant velocity?

• 0 N

• 1 N

• 9.8 N

• The forces keep changing

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NGSS.HS-PS2-1

Zayed and Khalid are ice skating. Zayed pushes Khalid, whose mass is 50 kg, with a force of 5.0 N. What is Khalid’s resulting acceleration?

• 5 m/s²

• 10 m/s²

• 1 m/s²

• 0.1 m/s²

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NGSS.HS-PS2-1

Complete the following statement: “Newton’s Second Law states .......................................................................... ”

• if object A exerts a force on object B then object B exerts an equal but opposite force on object A.

• the acceleration of an object is equal to the net force acting on the object divided by the mass of the object.

• an object continues to move with uniform velocity unless an external force acts upon it.

• the square of an object’s Force is proportional to the cube of the object’s acceleration.

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Which of the following best summarizes Newton’s first law of motion?

• Every action has an equal but opposite reaction.

• Force is equal to mass times acceleration.

• Inertia

• E = mc²

Inertia is the tendency of an object

• to resist changes in velocity.

• to cause changes in velocity.

• to cause acceleration to mass

• to create mass on an object with acceleration

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What is the weight of an astronaut who has a mass of 90 kg on the moon? (Note: acceleration due to gravity of the moon is 1.62 N/kg)

• 145.8 N

• 91.62 kg

• 90 N

• 90 Kg

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NGSS.HS-PS2-4

A 75 kg person stands on a weighing scale in an elevator. The scale reads 820 N. What is the magnitude of the elevator’s acceleration?.

• 11 m/s²

• 6.5 m/s²

• 1.13 m/s²

• 0.20 m/s²

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NGSS.HS-PS2-1

Which of the following best describes weightlessness?

• When your apparent weight is equal to your actual weight on earth.

• It does not happen to an object in free fall.

• When your apparent weight is not zero.

• When there are no contact forces acting to support you.

The amount of drag force experienced by a moving object is dependent on which of the following?

• The density and viscosity of the fluid it travels through only.

• The surface area of the object and the density of the fluid that it travels through.

• The weight of the object and the size of gravity it experiences.

• The color of the object and the viscosity of the fluid it travels through.

In the image below we can see a skydiver who is said to have reached terminal velocity. Which of the following best outlines the concept of terminal velocity?

• A skydiver when he/she starts to jump from a plane

• A skydiver when he/she accelerate at constant rate towards the Earth

• A skydiver when he/she reaches constant velocity when weight equals to drag

• A skydiver when he/she opens the parachute

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