Force and Motion Review

When was the speed of this moving object at a stop?

• between 0 and 2 hours

• between 1 and 5 hours

• between 4 and 5 hours

• between 6 and 7 hours

Tags

NGSS.MS-PS3-1

Luis rubbed a balloon on his hair and held the balloon next to the wall. He observed the balloon stick to the wall. Which of the following is responsible for the balloon sticking to the wall?

• electric force

• magnetic force

• friction

• gravity

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A contact force is a force that is exerted by an object when it touches another object. Which of the following is an example of a contact force?

• an orange falling from a tree

• a magnet repelling another magnet

• a wood block sliding across the top of a desk

• hair standing up after someone takes off a wool cap

Keesha correctly predicted how long it would take for the object to move 3 feet. If she calculated the speed to be 0.33 ft/sec, what was Keesha’s prediction?

• 7 seconds

• 8 seconds

• 9 seconds

• 10 seconds

Tags

NGSS.MS-PS3-1

Some forces require direct contact, while others, like gravity, act at a distance. Which of the following is NOT influenced by gravity?

• Earth’s tides

• your weight

• Earth’s orbit

• magnetism

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NGSS.MS-PS2-5

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Jasmine is conducting an investigation and moves a magnet near a compass, causing the compass needle to move. However, the magnet never touched the compass. This observation is evidence for which characteristics of magnetic fields?

• They can exert a force across a distance.

• They have a north pole and south pole.

• They are constantly changing direction.

• They can be generated by electricity.

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NGSS.MS-PS2-5

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Which line on the graph shows the object that is traveling with the fastest constant speed?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

Carla pushes a toy car and lets it go. The toy car rolls and gradually comes to a stop. What would make the car stop?

• A force must be applied in a direction pushing the car upward to make the car stop.

• A force must be applied in a direction pulling the car downward causing the car to stop.

• A force must be applied to the car in a direction opposite to that in which it is moving.

• A force must be applied pushing the car forward in the same direction as the moving car.

Tags

NGSS.3-PS2-1

Mr. Williams is giving examples of balanced and unbalanced forces. Which of the following situations is an example of unbalanced forces acting upon an object?

• A rock accelerating as it rolls down a hill.

• A science textbook lying on the floor.

• A car moving constantly at 30 miles per hour.

• A rope being pulled from both sides with equal force.

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Which of the following best describes the forces being applied in this situation?

• The forces are balanced, and the net force is zero.

• The forces are balanced, and the net force is negative.

• The forces are unbalanced, and the force of Horse 1 is greater

• The forces are unbalanced, and the force of Horse 2 is greater

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