Newton's Third Law

A book is at rest on a table. There is a force of gravity acting downward on the book. The action force is. The Earth causing a downward force on the book. What is the reaction force?

• The book stays on the table

• The table acts upwards on the book

• The book causes an upward force on the Earth

• The book moves through the table towards earth

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NGSS.MS-PS2-4

Josh pushes their friend, Erika, rightwards on a frictionless surface. The action force comes from Josh when Josh applies a force to the right on Erika. What is the reaction force?

• Erika causes a leftwards force on Josh

• Josh moves left

• Erika Moves right

• There is friction force acting on Erika to balance out the applied force from josh

Tags

NGSS.MS-PS2-1

Based on newton's 3rd law, when forces are equal and opposite will they have equal and opposite accelerations?

• Yes, since force causes acceleration equal force means equal acceleration

• No, equal and opposite forces cancel out causing the object to not accelerate

• No, acceleration depend on mass and acceleration. The objects could have equal force but different net force or different masses

• Yes only if the net force is equal to each other. Then the acceleration will be equal

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following statements best describe Newton's 3rd law?

• For every action, there is a reaction

• When forces balance out, it is due to a reaction force

• For every force acting on an object, there is an equal and opposite force acting on the object that caused the force.

• Forces on a singular object balance out

Tags

NGSS.MS-PS2-1

How many objects are required in order for a force to occur?

• 1

• 2

• 3

• 4

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NGSS.MS-PS2-1

What is an action and reaction pair?

• The forces that balance each other out on a free body diagram

• A pair of forces that act on different objects. The forces are equal in amount and opposite in direction

• A movement that is caused by another movement

• Description of events that explain the scenarios unfolding from observation

Tags

NGSS.MS-PS2-1

A ball falls to earth. What two objects are interacting to cause the force of gravity?

• The ball and the air

• The ball is causing force of gravity by itself

• The ball and the Earth

• The ball an the person that dropped the ball

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

When objects fall to earth due to the gravitational field of earth, if the force acting on the earth and the object is equal and opposite, why doesn't the earth accelerate upwards?

• There isn't any force acting on the earth

• Gravity was invented by the government to make people believe they are trapped on earth

• It does accelerate upwards at 9.8 m/s^2. We just don't notice because we are on earth

• The mass of the earth is so large, the acceleration is negligible

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NGSS.MS-PS2-4

NGSS.MS-ESS1-2

How are we able to walk forwards?

• We apply a force forwards with our feet that causes us to move

• We spin the earth with our feet. It makes us look like we are moving forwards when the earth is actually just moving backwards

• Walking isn't real. We are all in a simulation

• We apply a force downwards and backwards on the ground. The reaction force from the ground causes an upper ward and forward force on our body

A car is driving to the left on a road. Which of the following would be the action and reaction pair for the normal force acting on car

• The car has a force acting upwards on the car, therefore the car stays on the ground

• The action force is the force of gravity acting on the car, the reaction force is the normal force acting on the car

• Action force is the normal force acting on the car. Reaction is the car flying upwards at 9.8 m/s^2

• The action force is the normal force acting upwards on the car from the surface. The reaction force is the downwards force acting on the surface from the car

Tags

NGSS.MS-PS2-4