Electromagnetic Force Review

A ____________________ is needed to make a motionless object move

Tags

NGSS.MS-PS2-2

Air hockey is a game played on a specially designed table. Each player tries to slide a puck across the table into a goal. The table has tiny holes that create a cushion of air, lifting the puck a small distance above the playing surface. The cushion of air increases the speed of play because it _____

• increases the friction so the puck can be directed more e ciently

• increases the friction to give the puck an additional push

• lowers the friction between the mallet and the puck

• lowers the friction between the table and the puck

Tags

NGSS.MS-PS2-2

Two teams, Red and Blue, are playing soccer. Three players run after the ball and their feet make contact with the ball at the same time. Student J kicks the ball with 1200 N of force toward the Blue team’s goal. Student K kicks the ball in the opposite direction with 550 N. Student L kicks the ball in the same direction as Student K with 650 N of force. What happens to the ball and why?

• The ball moves toward the Blue goal because the force from Student K added to the force of Student L is more than the force from Student J.

• The ball stays right where it is because the net force is 0 N.

• The ball begins to move toward the Red goal because the force of Student K multiplied by the force of Student L is greater than the force of Student J

• The ball moves toward the Red goal because two students are kicking the ball in the same direction.

Tags

NGSS.MS-PS2-2

Three bar magnets are held together. What are the magnets going to look like when the hands let go of the magnets?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student has two magnets. One magnet is on top of the table. The other magnet is in his hand (1). He puts his hand with the magnet under the table, and the magnet on top of the table begins to move (2). This demonstration provides evidence that _____.

• the force of magnetism (the magnetic  eld) goes through some materials

• magnets sometimes repel each other

• magnets sometimes attract each other

• the bottom magnet makes the table into a temporary magnet; which then attracts the magnet on top so it moves

Tags

NGSS.MS-PS2-5

A student pushes with 650 N of force on a cart against a wall. The cart doesn’t move. How do you explain the forces at work and why the cart doesn’t move?

• The cart didn’t move because the wall pushed back with the same amount of force, 6

• The cart dosen't move because of gravity

• The cart dosen't move because of friction

Tags

NGSS.MS-PS2-1

Will this circuit will work?

• Yes

• No

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Will this circuit work?

• Yes

• No

Will this circuit work?

• Yes

• No

Which action would make an electromagnet stronger (able to pick up more paper clips)?

• Use thinner wire

• Add another D-cell into the circuit in series

• Wind fewer wraps around the core (rivet)

• Wind the wraps loosely rather than tightly around the core.

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-3