Forces and Motion

An engineer wanted to design a floor for a warehouse. Workers in the warehouse would need to push heavy boxes across the floor. The engineer tested four different materials by sliding a box across the surface and measuring the distance it took the box to stop.

Which of the following best explains which material would work best for the warehouse floor?

• The tile because it had the least friction.

• The wood because it would be easiest to push the boxes on.

• The dirt because it has the least friction.

• The asphalt because it has the most friction.

Tags

NGSS.MS-PS2-2

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

Students were asked to design and build K’NEX car powered by a rubber band. Their car is shown. Which of the following improvements would most likely improve the speed of their car?

• Add more K’NEX pieces to increase the mass.

• Add lubrication to decrease the friction.

• Add a sail to decrease the friction.

• Add larger tires to increase the volume.

Tags

NGSS.MS-PS2-2

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Which of the following best explains the motion of the car represented by section "D" of the graph?

• The car is going faster than it was in section "B"

• The car is stopped in section "D"

• The car is moving on level ground in section "D"

• The car is higher than it was in section "B"

A fifth grade class has a model car race. The students were divided into 4 groups. Each group built a model car for the race. Below are the results of the race. Which car won the race?

• Car 1

• Car 2

• Car 3

• Car 4

Shown are two magnets. Which of the following best explains what magnet "B" will do if it is free to move.

• The force of gravity will pull it to the left.

• The magnetic force will pull it to the left.

• The force of gravity will push it to the right.

• The magnetic force will push it to the right.

Tags

NGSS.3-PS2-2

NGSS.3-PS2-3

If an unbalanced force acts on an object at rest, the object will move in the direction of the force. Which of the following best models an object with unbalanced forces acting on it?

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Tags

NGSS.MS-PS2-2

What should she use as the independent variable in her investigation?

• Time

• Force

• Mass

• Speed

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

The arrows in the diagrams shown represent the size and direction of the forces that are acting on a cart. Different forces were applied to carts. The mass of each cart is the same.

If the carts started at rest, which one would speed up the most in a direction to the right of the page?

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Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Students are racing model cars they designed and built. Which design improvement would most likely increase the speed of the car?

• Put oil on the nails on which the wheels turn to decrease the friction.

• Decrease the size of the wheels so they can grip better.

• Increase the size of the wheels so they can grip better.

• Put glue on the nails on which wheels turn to increase the friction.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

What is a force?

• a push or pull

• speed or acceleration 

• potential or kinetic energy

• balanced or unbalanced force

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1