Law of Motion

According to Newton's Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because-

• the mass of the skateboard is the same as the mass of the person jumping off

• the pull of gravity on the person is the same as on the skateboard, regardless of size

• the air resistance on the person is great and the friction on the skateboard is small

• for the force that sent the person forward, there is an equal force pushing back on the skateboard

Tags

NGSS.MS-PS2-1

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

• The rocket is protected from the heat of the exhaust

• Burned fuel can be collected on the ground

• As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward

• This allows the rocket to be steered properly

Tags

NGSS.MS-PS2-1

Newton's Third Law describes action and reaction forces. A table for four scenarios is provided. Which of the following scenarios in the table show equal and opposite reaction forces?

• The rocket and balloon

• The rocket and train

• The balloon and girl

• The train and girl

Tags

NGSS.MS-PS2-1

Which best describes Action and Reaction forces?

• Action forces happen BEFORE Reaction forces

• They happen simultaneously (at the same exact time)

• Reaction forces happen first

• Happen at different times depending on the situation

Tags

NGSS.MS-PS2-1

Look at the diagrams that describe force and direction. Choose the best statement below.

• Diagram on the left is correct for contact forces. The diagram on the right is also correct just a different force

• You must change the diagram on the right to a blue arrow that says rock to make it correct. You can't mix a contact force and an at-a-distance force

• Change the blue rock arrow to a brown gravity arrow and the diagram on the left will be correct

• Both diagrams are correct as they are labeled, as that is what the forces do

Tags

NGSS.MS-PS2-4

A child kicks a soccer ball with a force of 65 Newtons. What is the force exerted by the ball on the child's foot, and what is its direction?

• 65 Newtons: Same Direction

• 65 Newtons: Opposite Direction

• 130 Newtons: Opposite Direction

• 130 Newtons: Same Direction

Tags

NGSS.MS-PS2-1

Newton's Third Law is also known as

• The law of Inertia

• The law of Force and Acceleration

• The law of Action-Reaction

• The law of Speed

Tags

NGSS.MS-PS2-1

Newton's Second Law is also known as

• The law of Inertia

• The law of Force and Acceleration

• The law of Action-Reaction

• The law of Speed

Tags

NGSS.HS-PS2-1

Newton's First Law is also known as

• The law of Inertia

• The law of Force and Acceleration

• The law of Action-Reaction

• The law of Speed

When pressing down on a table, why does your hand not go straight through the table?

• You are pressing down with the same amount of force that the surface is pressing up

• The surface is not exerting any force

• You are pressing down with a different amount of force than the surface is pressing up

• You aren't strong enough

Tags

NGSS.MS-PS2-2