Laws of Motion and Simple Machines

When you drop an item, what is the force that pulls it to the ground?

• mass

• acceleration

• gravity

• distance

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1. What of these are used to describe motion?

• time, force, gravity

• resistance, force, time

• friction, direction, resistance

• distance, time, direction

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Jenny is roller blading on a flat sidewalk. She stopped moving and keeps rolling. What will cause her to slow down and stop?

• motion

• gravity

• speed

• friction

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NGSS.MS-PS3-5

A plastic bag glides slowly to the ground. What force is acting on it?

• force

• air resistance

• gravity

• low mass

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What is an example of a balanced force?

• sitting in a chair

• riding a bike down a hill

• sledding down a hill

• pushing a cart up a ramp

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The outdoor ice rink is bumpy after snowy conditions. How will this surface with more friction affect an ice skater?

• It will help them skate faster

• it will cause less wear on the skate

• It will require the skater to work harder to skate

What unit do you use to measure force?

• milliliters

• Newtons

• grams

• miles per hour

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Which simple machine changes the direction of the force needed to move an object up or down?

• pulley

• inclined plane

• lever

• wedge

How do simple machines help get work done?

• they make people lazy and not have to do anything

• they make the work harder

• they reduce the amount of force needed to do work

• they make people stronger

Pick the example of a wheel and axle:

• opening a curtain

• turning a key in a lock

• twisting off a cap

• pedaling a tricycle

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