Grade 4 Energy: Non-contact forces Unit review

Which activity would help students understand the concept of magnetic fields?

• Experiment – egg drop test

• Activity – will the magnets attract or repel?

• Experiment – bending water

• Coding activity – hard drives and binary code

What is electrostatic force?

• The force between two objects caused by friction

• The force between two objects caused by their magnetic fields

• The force between two charged objects

• The force between two objects due to gravity

What is true about magnetic poles?

• Like magnetic poles attract each other

• Magnetic force is weakest at the magnetic poles

• Opposite magnetic poles attract each other

• Magnets have only one magnetic pole

What action is being performed by the person fishing?

• Push

• Pull

• Cast

• Reel

Which of the following is an example of a pull force?

• Kicking a ball

• Climbing a rope

• Shooting a basketball

• Plugging in a cord to an outlet

What action is the donkey doing with the cart?

• Push

• Pull

• Carry

• Kick

What does it mean to repel?

• To pull objects towards each other

• To cause a chemical reaction

• To push away or drive back

• To increase the gravitational force between objects

What is a force?

• A type of energy that is stored in objects

• A push or pull that causes an object to move

• The speed at which an object moves

• A measure of how heavy an object is

What type of force causes a magnet to attract nails without touching them?

• Contact Force

• Non-Contact Force

• Gravitational Force

• Applied Force

What is an example of electric forces being non-contact?

• A battery providing power to a remote control.

• A light bulb being turned on by a switch.

• Static electricity making your hair move on a trampoline without touching it.

• Plugging in a device to charge it.