Motion

Which graph below shows an object slowing down? (Hint: this is speed vs time graph)

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Tags

NGSS.MS-PS3-1

If the unequal opposing forces are applied to the cart at the same time, what will occur?

• The cart will move to the left.

• The cart will move to the right.

• The cart will alternate between moving left 
and right.

• The cart will remain stationary.

Answer explanation

360-270=90 to the right

Tags

NGSS.MS-PS2-2

Which statement best summarizes the scientific concept shown in the cartoon?

• A falling body accelerates at a constant speed.

• The motion of an object is constantly changing due to magnetic forces.

• The force of friction causes an object in motion to move faster.

• A body in motion will remain in motion unless influenced by an outside force.

Answer explanation

1st law of motion, object in motion will continue moving unless there is a force that acts on it.

Tags

NGSS.MS-PS2-2

An object accelerates at 3 m/s² when a 10 N force is applied to it. Which force would cause this object to accelerate at 6 m/s²?

• 5 N

• 10 N

• 20 N

• 30 N

Answer explanation

If 3 m/s2 -> 10 N

then 6 m/s2 -> 20 N

Tags

NGSS.MS-PS2-2

Water comes through a hose and is sprayed by the sprinkler. Which principle best explains why the sprinkler spins?

• Every action has an equal and opposite reaction.

• Solid substances are usually more dense than liquid substances.

• Energy is released when water condenses.

• Most substances expand when heated and contract when cooled.

Answer explanation

3rd law, action/ reaction, water goes one direction then the hose will go the other direction, making the sprinkler spin.

Tags

NGSS.MS-PS2-1

In which diagram would the block of wood have the greatest acceleration?

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Answer explanation

Use F=ma

Tags

NGSS.MS-PS2-2

Which car traveled at an average speed of 20 kilometers per hour?

• A

• B

• C

• D

Answer explanation

speed = distance/ time

60 / 3 = 20

Tags

NGSS.MS-PS3-1

Which object would have the greatest force?

• a 5-kg object accelerating at 10 m/s²

• a 5-kg object accelerating at 20 m/s²

• a 20-kg object accelerating at 4 m/s²

• a 20-kg object accelerating at 3 m/s²

Answer explanation

F= ma, 5x20 = 100 N

Tags

NGSS.MS-PS2-2

A student pushes against a tree with a force of 10 newtons (N). The tree does not move. What is the amount of force exerted by the tree on the student?

• 0 N

• 5 N

• 10 N

• 20 N

Answer explanation

Balanced force

Tags

NGSS.MS-PS2-1

During which time interval was the runner moving at the greatest average speed?

• 0–5 minutes

• 10–15 minutes

• 15–20 minutes

• 25–30 minutes

Answer explanation

the line is more steep during that time interval

Tags

NGSS.MS-PS3-1