Force and Motion

A bowling ball with a mass of 70 g is rolling across a flat surface at 80

meters per minute. Another bowling ball with mass of 35 g is rolling

across the same surface at 40 meters per minute. Which best explains

why the 35-g ball rolls at a slower speed?

• More force is used to roll the 35-g ball.

• More force is used to roll the 70-g ball.

• The greater mass of the 70-g ball causes it to roll faster.

• The smaller mass of the 35-g ball causes it to roll more slowly.

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NGSS.MS-PS2-2

A child rides a wagon down a hill. Eventually, the wagon comes to a stop.

Which is most responsible for causing the wagon to stop?

• gravity acting on the wagon

• friction acting on the wagon

• the mass of the wagon

• the mass of the child

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NGSS.MS-PS2-2

NGSS.MS-PS3-5

A pencil falls off of a desk. What moves the pencil toward the floor?

• mass

• friction

• gravity

• speed

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NGSS.3-PS2-1

NGSS.5-PS2-1

A book is being pushed across a table. If an equal force is applied to the

book in the opposite direction, which will most likely be the result?

• The book will increase in speed.

• The book will decrease in speed.

• The book will fall off the side of the table.

• The book will continue moving at the same speed

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

If a small rock and a large rock are both thrown at a wall at exactly the

same speed, which rock would most likely cause more damage to the

wall?

• The large rock would cause more damage because the force would be

  spread out on a larger area.

• The large rock would cause more damage because it has a greater

  mass, making the momentum greater.

• The small rock would cause more damage because it has a smaller

  mass, making the momentum greater.

• The small rock would cause more damage because all of the force

  would be concentrated on one small area.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Marcus traveled west for 2 hours at 50 mph. He then traveled east for

another hour at 25 mph. How many total miles did Marcus travel? (speed

= distance ÷ time)

• 25 miles

• 75 miles

• 125 miles

• 150 miles

This graph shows how a delivery truck traveled in one workday. How far did the truck travel from hour 4 to hour 5 of its delivery schedule?

• 0 km

• 50 km

• 100 km

• 150 km

A hot air balloon is floating in the atmosphere. If a burst of hot air were

blown up into the balloon, which would most likely occur?

• The balloon would rise.

• The balloon would descend.

• The balloon would travel sideways.

• The balloon would remain in the same place.

James and Roy compare the motion of two balls by rolling them across

the floor and recording the time it takes them to travel the same

distance. Ball X travels the distance in 15 seconds. Ball Y travels the

distance in 11 seconds. Which best compares the motion of the two

balls?

• Ball X travels faster than Ball Y.

• Ball Y travels faster than Ball X.

• Both balls travel at the same speed.

• Both balls travel at a constant speed.

Maria pulled an empty cart to the library. When she leaves the library, the

cart is full of books. How does the force of friction on the cart change?

• The force of friction increases because there is more mass.

• The force of friction decreases because there is more air pressure.

• The force of friction increases because the force of gravity decreases.

• The force of friction stays the same because Maria is still pulling the

  cart with the same force.

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NGSS.MS-PS2-2