8th Grade Semester 1 Final

First Name, Last Name

Evaluate responses using AI:

OFF

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

• 100 N, same direction
• 100 N, opposite direction
• 200 N, same direction
• 200 N, opposite direction

Tags

NGSS.MS-PS2-1

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 downward and the gases push the rocket upward.
• This allows the rocket to be steered properly.

Tags

NGSS.MS-PS2-1

Which of the scenarios described 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

The head of a hammer is often made of steel. This makes the head heavy, which helps create a strong force for driving nails. Steel is also strong. The head of a hammer must be strong to resist what force?

• The force of the air resistance on the moving hammer
• The force of the person using the hammer
• The force of gravity pulling down on the hammer
• The force of the nail pushing in the opposite direction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two metal spheres are suspended on wires so that they hang next to each other, just touching. Sphere X is raised to a certain height and released. Without friction or air resistance, describe what would happen to Sphere Y.

• Sphere X would swing out in the opposite direction (to the right) to the same original height as Sphere X.
• Sphere Y would bounce back direction (to the left) to the same original height as Sphere X.
• Sphere X would bounce back direction (to the left) to the same original height as Sphere Y.
• Sphere Y would swing out in the opposite direction (to the right) to the same original height as Sphere X.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A 500-N girl standing on a dock exerts a force of 100 N on a sailboat as she pushes it away from the dock. Describe the amount of force that the sailboat exerts on the girl.

• 100 N
• 500 N
• 50 N
• 250 N

Tags

NGSS.MS-PS2-1

Identify the action and reaction forces of a rocket blasting off.

• The action is the gas pushing on the rocket in the opposite direction.The reaction of the rocket is the expelling of gas from the engine.
• The fire from the enegin
• The action of the rocket is the expelling of gas from the engine. The reaction is the gas pushing on the rocket in the opposite direction.
• Gravity

Tags

NGSS.MS-PS2-1

Which blocks will experience a change in motion, or acceleration?

• Blocks 1 and 2
• Blocks 2 and 3
• Blocks 1 and 3
• Blocks 1, 2 and 3

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2