Physics Basics Forces

When stopping suddenly, what explains this image?

• Newton's first law
• Newton's second law
• Newton's third law
• Kinetic friction

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NGSS.HS-PS2-1

What explains this difference in acceleration despite an equivalent force?

• Newton's First Law
• Newton's Second Law
• Newton's Third Law
• Newton's Fourth Law

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NGSS.HS-PS2-1

What explains this observation?

• Newton's first law
• Newton's second law
• Newton's third law
• Special relativity

What explains the fact that it takes a lot of effort to start pushing a couch along the carpet, but it is easier to maintain its movement when it is already moving? 

• Static friction is larger than kinetic firction
• Kinetic friction is larger than static friction
• Newton's law of inertia
• F = ma

Which of the following is a scalar quantity

• Velocity
• Force
• Time
• Displacement

A normal force:

• Is the force pair of weight force
• Always acts in the opposite direction to the applied force
• Always acts in a direction perpendicular to the surface
• Is equivalent in magnitude to the weight force.

Weight is measured in ____ and is a _____

• Newtons, Force
• Kg, Force
• Newtons, Mass
• Kg, Mass

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NGSS.HS-PS2-1

If Jane has a reading of 50kg when she stands on the scales on the ground, what would her weight be if she was travelling at a constant velocity of 9.8ms^-1 upwards on a lift?

• 50kg
• 100kg
• 25kg
• None of these answers

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NGSS.HS-PS2-1

Which of the following is incorrect?

• If something is moving at constant velocity, then there are no forces acting upon it.
• Even at the top of its arc, a tennis ball always experiences constant acceleration when it is bounced.
• When an object is in free-fall, it is weightless.
• Newcastle united ARE the best football team!

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NGSS.HS-PS2-1

Which of the following are incorrect when applied to Newton's third law?

• Each force acts on the same object
• Forces are equal in magnitude
• Forces are opposite in direction
• Each force has the same fundamental nature