Exploring Forces

Each sentence describes the effect of a force.

• 1: Magnetism; 2: Normal; 3: Gravity; 4: Friction; 5: Applied

• 1: Gravity; 2: Applied; 3: Friction; 4: Normal; 5: Magnetism

• 1: Applied; 2: Friction; 3: Normal; 4: Magnetism; 5: Gravity

• 1: Friction; 2: Magnetism; 3: Applied; 4: Gravity; 5: Normal

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A worker pushes a large box across the smooth floor of a warehouse. Four forces, labeled A through D, are shown in the diagram.

Which correctly identifies the forces shown?

• Force A: Applied; Force B: Friction; Force C: Gravity; Force D: Normal

• Force A: Friction; Force B: Gravity; Force C: Normal; Force D: Applied

• Force A: Applied; Force B: Normal; Force C: Gravity; Force D: Normal

• Force A: Normal; Force B: Friction; Force C: Applied; Force D: Gravity

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NGSS.MS-PS2-2

Choose the answers that describe the changes to the scenario that would affect Forces B and C. Select all that apply.

• Objects are added to the box to make it much heavier.

• The worker is replaced with someone stronger.

• The worker pushes the box over an uneven or rough floor.

• Objects are removed from the box to make it much lighter.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Identify the true statement(s) about the force that occurs between our planet and the moon that keeps the moon in orbit. Select all that apply.

•  Gravity is an attractive-only force that pulls objects towards other objects.

• Magnetism between Earth and the moon is possible due to the composition of metals within Earth’s core.

• Friction is a contact or non-contact force that increases in strength as distance decreases.

• The greater the mass of an object, the greater the force of its gravity on other objects.

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

According to NASA, our moon moves approximately one inch away from Earth each year. If this pattern continues, how could the increased distance affect the strength of the force between Earth and the moon?

• As distance increases, the strength of the force would increase.

• As distance increases, the strength of the force would weaken.

• The strength of the force would increase and decrease due to other factors.

• The strength of the force would not change, because it is not dependent on distance

Tags

NGSS.MS-PS3-2

As swimmers propel themselves through water, there are a variety of forces at work.
Which forces are acting on the swimmer in the diagram at A and B? Select all that apply.

• Force A is the frictional force known as water resistance that pulls the swimmer backward.

• Force A is the applied force the swimmer uses to propel themselves through the water.

•  Force B is the normal force that is equal to and cancels out the force of gravity pulling the swimmer.

• Force B is the gravitational force pulling the swimmer towards the Earth’s surface.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Identify and explain what forces act as a stationary bicycle rests on the pavement with its rider. Select all that apply.

• The gravitational force of Earth exerts a downward force on the bicycle and its rider.

• Normal force acts equal and opposite to the downward force of the bicycle and rider, and perpendicular to the contact surface.

• Normal forces are applied downward on the bicycle and rider and downward on the pavement during contact.

• Frictional force acts equal to and in the opposite direction of gravity at the time of contact to prevent solid objects from passing through each other.

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NGSS.MS-PS2-4

Two workers at a furniture store are moving a couch to another display. One worker pushes with a force of 150 N and the other pushes with a force of 180 N in the same direction.

What is the net force exerted on the couch?

• 30 N

• 150 N

• 180 N

• 330 N

Tags

NGSS.MS-PS2-2

Two workers at a furniture store are moving a couch to another display. One worker pushes with a force of 150 N and the other pushes with a force of 180 N in the same direction.

Determine whether the forces acting on the couch are balanced or unbalanced.

• The forces are unbalanced because the net force equals zero.

• The forces are balanced because the net force does not equal zero.

• The forces are balanced because the net force equals zero.

• The forces are unbalanced because the net force does not equal zero.

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NGSS.HS-PS2-1

A student in gym class wants to climb the rope attached to the ceiling. They pull with a force of 80 N but do not move off the ground.

What is the net force exerted on the student?

• 0 N

• 40 N

• 80 N

• 160 N

Tags

NGSS.MS-PS2-2