Exit Check 2.2 - 3rd Law

2.2.2

Watch as Blake begins to run. What happens to the sheets of paper under his feet? Why?

• Blake runs so fast that the paper appears to move backwards but actually stays still

• When Blake moves forward, the air moved into the space he had been and pushes the paper around.

• When Blake pushes backwards on the paper the paper pushes forward on him. The paper moves backward and Blake moves forward.

• Newton was wrong.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1

2.2.2

When you jump up, you push the earth downwards. Why does this cause you to move upwards?

• You don't move upwards, you stay where you are and push the earth down. The earth isn't standing on anything so it easily moves.

• The question is wrong because you can't push the earth downwards. To jump you pull yourself upwards.

• Don't overthink it. It just works.

• When you push down on the earth it pushes back up on you. The upward force of the earth in reaction to your downward push makes you move up.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-4

2.2.2

How does a rocket accelerate out in space where it has nothing to push against?

• The rocket pushes super hot gas backwards. The reaction pushes it forward.

• The rocket makes fire which can create force without a reaction force.

• It is not possible to accelerate in space.

• Rocket is never alone, he always has Groot.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1

2.2.1

A player throws a ball. Which of the following correctly describes the applied and reaction forces?

• The player pushing on the ball is the applied force. The ball pushing on the player is the reaction force.

• The ball pushing on the player is the applied force. The player pushing back on the ball is the reaction force.

• The player's hand moving is the applied force. The ball moving is the reaction force.

• The player pushing on the ball is the applied force. The wind pushing on the ball is the reaction force.

Answer explanation

This question links to success criteria 2.2.1: I can identify action and reaction forces.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1

2.2.1

A book sits on a table. Gravity pulls the book down but the book is not moving. What is the reaction force?

• The table pushes up on the book (Normal Force).

• Friction pushes up whenever the book is moving. (Frictional Force)

• The book pulls itself up. (Magical force)

• The moon's gravity pulls up to keep the book on the table (gravitational force).

Answer explanation

This question links to success criteria 2.2.1: I can identify action and reaction forces.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.2.1

When you drop a rubber ball on the floor it bounces back. During the bounce, which of the following describes the applied and reaction forces correctly?

• The ground pulled the ball down (applied force), but the air pushes it back up (reaction force).

• Gravity pulled the ball down (applied force), and when it hits the ground, the ground pushes it back up (reaction force).

• The air pushes the ball upward (applied force) while the person pushes it down (reaction force).

• Darth Vader pulls it down (applied force), but Obi-wan pushes it up (reaction force).

Answer explanation

This question links to success criteria 2.2.1: I can identify action and reaction forces.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1

2.2.3

When a bug hits a car's windshield the bug goes splat but the car does not. If the forces on them are equal, why does this happen?

• The car is moving faster than the bug, so it doesn't get damaged.

• The force on the bug is larger because the car is larger

• Bugs can go splat from a much smaller force so equal force splats the bug and not the car

• Newton was wrong

Answer explanation

This question links to success criteria 2.2.3: I can identify why the same force can have differing effects on different objects.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1

2.2.3

When you push down on the earth to jump, you move from the reaction force but the earth does not. Why?

• Earth is the only thing creating forces, so you move.

• The forces are equal, but it is easier to move you than the Earth, so you move.

• You made the force by pushing down, so you move - there is no force on the Earth.

• The forces are not equal. Earth is much stronger than you

Answer explanation

This question links to success criteria 2.2.3: I can identify why the same force can have differing effects on different objects.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-2

2.2.3

No matter how hard a horse pulls on a cart, the cart must pull back with exactly the same force according to Newton’s Third Law.  Why does the cart move forward instead of the horse moving backward?

• Horses can't move backward no matter what.

• The cart has wheels which allow it to move more easily.

• The horse and cart do not pull with the same force. The horse is pulling harder, so the cart goes forward.

• The cart pushes the horse forward.

Answer explanation

This question links to success criteria 2.2.3: I can identify why the same force can have differing effects on different objects.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.2.2

A person steps out of the boat and onto the dock. As the person moves forward onto the dock, the boat moves backward. Which statement best describes the backward motion of the boat as the person steps forward?

• The backward motion of the boat is the reaction to the action of the person stepping onto the dock.

• The mass of the person exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

NGSS.MS-PS2-1