Kinchler - TCAP - 8th - Forces, Magnets, Newton's Laws

The electrons in a wire coil are most likely moved by a magnet when a magnet is ...

• moved back and forth through the wire coil

• repelled by another magnet

• connecting a glass rod to a battery with a wire

• connecting a light bulb to a switch and a wire

Tags

NGSS.HS-PS2-5

Which statement best describes the process of building an electromagnet?

• attach two bar magnets together using copper wire

• place an iron nail onto each terminal of a battery

• attach the ends of a copper wire coiled around an iron nail to the terminals of a battery

• connect one end of a copper wire to a battery terminal while placing the other end in a glass of salt water

Which diagram best represents a magnetic field?

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Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What do the magnetic field of Earth, a bar magnet, and an electromagnet all have in common?

• symmetrical lines of force

• attract plastic rods without difficulty

• their north poles attract other north poles

• they produce electrical current without assistance

Tags

NGSS.MS-PS2-5

Which characteristic distinguishes an electromagnet from a bar magnet?

• Only a bar magnet repels like poles.

• Only a bar magnet attracts iron fillings.

• Only an electromagnet requires a current.

• Only an electromagnet has opposite poles.

A student plots the magnetic field of a bar magnet using a compass. The student centers the bar magnet in the middle of a piece of paper and uses the compass to plot points around the magnet. Which diagram best shows the magnetic field around a bar magnet?

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Tags

NGSS.MS-PS2-3

Gravity is the force that pulls objects down towards Earth's surface. Which two statements explain why a student standing at the top of a step stool does not move downward?

• The student's mass is not large enough to be affected by gravity.

• The step stool exerts a force on the student in the opposite direction of gravity.

• The student exerts an upward force on the step stool equal to the gravitational force.

• The step stool is a barrier that blocks the gravitational force.

• The step stool exerts a force on the student equal to the force gravity exerts on the student.

Tags

NGSS.MS-PS2-4

A person performed 100 newton-meters of work by moving an object into a truck with a ramp 5 meters long. How much force was needed to move the object into the truck? (a)  

• 20 newtons
• 95 newtons
• 105 newtons
• 500 newtons

A person sits in a chair with wheels. He pushes on a wall with his legs and applies a force directly to the wall. The push force causes an applied force in the opposite direction, as shown in the picture. Which scientific principle best identifies why the person moves away from the wall?

• the law of gravity

• the principle of inertia

• Newton's second law of motion

• Newton's third law of motion

Tags

NGSS.MS-PS2-1

A company is manufacturing a platform to help painters reach high places. The platform is supposed to support up to 3,000 N. Which is the best way for the company to test the platform to make sure it supports the weight for which it is designed?

• place objects on the platform that are slightly greater than 3,000 N

• place objects on the platform that are slightly less than 3,000 N

• release the platform holding 3,000 N from a given height

• drop 3,000 N objects from a given height onto a platform

Tags

NGSS.MS-PS2-5