Force and Motion Unit Review

If someone running sprints from one side of a field to the other, what are they experiencing?

• distance

• motion

• position

• refraction

How fast an object is moving is its...

• direction

• motion

• position

• speed

When Jackson throws a baseball in a straight path, what two forces cause the ball to eventually stop moving?

• gravity and friction

• mass and ground force

• wind resistance and mass

• negative acceleration and gravity

Tags

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The hummingbird shown here must beat its wings repeatedly to hover over flowers and drink nectar. What force does the beating of the hummingbird’s wings overcome?

• entropy

• gravity

• intertia

• momentum

Tags

NGSS.MS-PS2-4

The moon and other satellites rotate around the earth. Identify the force that keeps these satellites in orbit.

• gravity

• friction

• a strong force

• electromagnetic force

Tags

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Ashley made a paper boat and attached paperclips to the edges. In order to control her boat she used a horseshoe magnet. How is Ashley able to control her boat without touching it?

• The boat is moving with the currents of the water.

• The boat is attracted to the magnet by the force of gravity.

• The boat is attracted to the magnet by the force of magnetism.

• Ashley would not be able to do this without touching the boat.

Tags

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What must occur to a shopping cart at rest in order to make it roll forward?

• A force must be provided to overcome gravity.

• Balanced forces must be acting upon the cart.

• An unbalanced force applied to the cart pushing or pulling it forward.

• The unbalanced force acting upon it must be smaller than that of friction.

Tags

NGSS.MS-PS2-2

Two opposite forces are acting on a box, but the box does not move. What can we say that is true about the affect of the forces on the box?

• It cannot be determined without knowing which man is stronger.

• It cannot be determined without knowing the surface the box is on.

• The forces are balanced. But, the forces acting on the box have increased and the box's motion is affected.

• The forces are balanced. Thus, there is no change in forces acting on the box and the box's motion is not affected.

Changes of motion are caused by...

• all forces.

• strong forces.

• balanced forces.

• unbalanced forces.

Tags

NGSS.MS-PS2-2

A train rolls to a stop along a horizontal track with the conductor applying the brakes. What answer choice BEST explains why this occurred?

• The train ran out of momentum.

• The opposing force of friction stopped the train.

• The natural state of the train is not to be in motion.

• The force of gravity slowed the train until it stopped.

Tags

NGSS.MS-PS2-2