Physics Written Response Concepts

Newton's ​ (a)   Law states that objects in motion tend to stay in motion, and objects at rest tend to stay at rest unless acted upon by an outside force.

• First
• Second
• Third

Answer explanation

This is the "I'm Chillin" Law, objects will continue to do whatever they are currently doing until they are forced to stop or do something else.

Newton's ​ (a)   Law states that Force is equal to the Mass times the Acceleration (f = ma).

• First
• Second
• Third

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NGSS.MS-PS2-2

Newton's ​ (a)   Law states that for every action there is an equal and opposite reaction.

• First
• Second
• Third

Answer explanation

This is the "Face Slap" law. If you were to slap Mr. Sam in the face, it would be accurate to say that Mr. Sam's face also slapped your hand with the same amount of force.

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NGSS.MS-PS2-1

Two runners are running around a track in different directions. The runners have the same ​ (a)   but they do not have the same ​ (b)   .

• speed
• velocity

Answer explanation

Velocity is speed in a specific direction. The two runners are running at the same speed, but different velocities because they are running in different directions.

All objects on Earth accelerate downward at 10 m/s² due to gravity. However, if I drop a bowling ball and a feather at the same time, the bowling ball will hit the ground first. Why?

• The bowling ball is heavier.

• Wind resistance has a greater effect on the bowling ball.

• Wind resistance has a greater effect on the feather.

• The feather is lighter.

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NGSS.MS-PS2-4

A ball is dropped off of a tower. How fast is the ball accelerating after 3 seconds?

• 3 m/s²

• 30 m/s²

• 10 m/s²

Answer explanation

All objects accelerate at 10 m/s². While the ball's SPEED would be 30 m/s², the rate of acceleration is always 10 m/s².

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

If I were to throw a ball straight up at 70 m/s², how long would it be before the upward velocity of the ball is 0 m/s²?

• 7 minutes

• 7 seconds

• 70 seconds

• 10 m/s²

Answer explanation

Gravity is pulling the object downward at 10 m/s². Therefore, the ball loses 10 m/s² of speed every second. After 7 seconds the speed of the ball would be 0 m/s².

Tags

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According to Newton's Third Law, if I run into a wall, the wall will hit me back with an equal amount of force. Why do I bounce back but the wall stays still?

• The wall is stronger than me.

• The wall is bigger than me.

• The wall has more height than me.

• The wall has more mass than me.

Answer explanation

It is true that the wall is hitting me with the same amount of force. However, the wall has much more mass than me. Therefore, the effect of the wall hitting me is much greater than the effect of me hitting the wall.

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NGSS.MS-PS2-1

If I hit a golf ball in space, the ball will travel forever (assuming it doesn't encounter gravity or another object). Would it be accurate to say the ball will accelerate forever?

• Yes, as long as nothing stops it.

• No, it will eventually slow down due to wind resistance.

• Yes, there is no limit to how much an object can accelerate in space.

• No, the acceleration is limited by how much force the ball is hit with.

Answer explanation

Acceleration is limited by force and by mass. If a golf ball is hit in space, it will reach a maximum acceleration based on how much force it was initially hit with.

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Mass is a measure of how many​ (a)   are in an object. This number ​ (b)   change based on location.

• kilograms
• pascals
• atoms
• does not
• does

Answer explanation

Mass is unaffected by location or gravity. If I have a box with 10 marbles in it, and I fly that box to the moon, it will still have 10 marbles in it.

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