Newton's Laws of Motion

Forces occur in pairs. The first force is called the action force. The second force would be called the:

• moving force

• momentum force

• reaction force

• kinetic force

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NGSS.MS-PS2-1

If you are wearing roller skates and you push against a wall, you roll backwards. Why?

• The wall is bigger than you are, so it pushes you with a greater force than you push it.

• Every action has an equal and opposite reaction.

• There is no friction between your roller skates and the floor.

• You and the wall have opposite charges, so the wall repels you

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NGSS.MS-PS2-1

An object is accelerating when _______________.

• it is not moving

• it is spinning around

• it is changing speed or direction

• it continues at the same speed

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NGSS.MS-PS2-2

Suppose an astronaut floating in space throws a rock. What will happen to the rock?

• It will continue to move in the same direction but will eventually slow down and stop.

• It will continue to move in the same direction, speeding up as it moves.

• It will continue to move at constant speed in the same direction until it is acted on by another force.

• It will go into orbit around the astronaut.

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NGSS.MS-PS2-2

NGSS.MS-PS3-1

When one figure skater pushes on another, both skaters move in opposite directions. Which of Newton's laws of motion best explains why this occurs?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Fourth Law

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NGSS.MS-PS2-1

A satellite in orbit is considered to be accelerating because:

• A satellite in orbit is considered to be accelerating because:

• it keeps moving faster and faster.

• it is constantly changing its direction of motion.

• it is moving in a straight line with a constant speed.

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Suppose you were to fill a balloon with air then let go of it without tying it closed. What causes the balloon to fly away?

• Your breath contains helium, which is lighter than air.

• The balloon's movement is the reaction to the force of air escaping.

• The warm air from your breath is less dense than the cooler air around the balloon, and warm air always rises.

• The air around the balloon is under higher pressure, so it pulls the balloon forward.

What is the mass of a stone that accelerates at the rate of 2 meters/second^2 when a force of 500 N is placed on it?

 $F=ma;\ \ a=\ \frac{f}{m}\ ;\ or\ \ \ m\ =\frac{f}{a\ \ }$  

• 25 kg

• 250kg

• 1,000kg

• 2,000kg

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NGSS.MS-PS2-2

While you’re ice-skating with your friends, you push off from one end of the rink and slide forward. Based on Newton’s first law of motion, what is true?

• You will lose your balance and fall over before you reach the middle of the ice rink

• You will continue to slide across the ice until a force makes you stop or change direction.

• The force of gravity will make you keep your velocity until your friends make you stop.

• The size of your ice skates will determine how quickly or slowly you travel across the ice.

What is inertia?

• the amount of force necessary to make an object at rest start moving

• an object’s velocity combined with its friction

• what keeps an object steady, whether at rest or moving at the same velocity

• the amount of friction necessary to slow down an object in motion