IS2- Non contact Forces

When a current is passed through wire and placed near a magnetic compass

• the current in the wire produces a magnetic field that exerts a force on the compass needle.

• The copper needle magnetizes the copper wire.

• The insulation on the wire becomes charged and exerts a force on the compass needle.

• The copper wire magnetizes the compass needle.

What can be conclude about electricity and magnetism?

• They have nothing to do with each other.

• They are both moving electrons.

• They cannot be controlled.

• They can be controlled.

A ball is dropped from the top of the tower. It takes 4 seconds to hit the floor. What is the speed of the object when it hits the ground.

• 9.8 m/s

• 49 m/s

• 39.2 m/s

• 58.8 m/s

How are electromagnets different from regular magnets?

• They can be turned on and off

• Their polarity can be reversed

• Their strength can be changed

• All of the above

What is true about electromagnets?

• Smaller Battery can make the field stronger

• More coils around the object become magnetized can make the field stronger

• They cause an Increase friction in a system.

• They make something already magnetized have a stronger field.

A 30 N brick is on a 10 m building. What is the PE?

• 300 Joules

• 3 Joules

• 294 Joules

• 30.6 Joules

What is the unit for Energy?

• Kg

• m/s

• KE or PE

• J

What is the formula for KE?

• 1/2 x mass x velocity²

• Weight x Mass

• Mass x Acceleration

• 9.8 x time

What is the formula for PE?

• 1/2 x mass x velocity²

• Weight x Height

• Mass x Acceleration

• 9.8 x time

What choice is True in regards to what the first incline of a roller coaster is the highest point.

• So riders can feel maximum Positive G's

• That is just the rule of thumb when engineering roller coasters

• It gives the coaster Max KE to be transformed throughout the ride.

• It gives the coaster Max PE to be transformed throughout the ride.