Know It All Friday - 8th Science - 7

If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.

• They will not move at all.

• The boy in red will win.

• Both will fall down.

Forces always act in equal and opposite pairs.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

Which direction will the object move?

• Up

• Down

• Right

• Left

As distance between two objects increase the pull of gravity 

• Increases

• Decreases

• Stays the same

Two factors effecting the magnitude of the force of gravity between 2 objects are...

• mass and distance 

• mass and matter

• distance and weight 

• weight and mass

The amount of matter in an object is called its

• inertia.

• mass.

• force.

• balance.

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.

• Use a smaller battery.

• Reverse the poles of the magnet.

• Remove all the coils and the nail.

Why are paper clips attracted to magnets?

• They contain silver.

• They contain aluminum

• They contain tin.

• They contain iron. 

Mechanical waves are created when a source of energy causes a medium to  _________________.

• vibrate

• expand

• move

• compress

What number represents the wavelength?

• 1

• 2

• 3

• 4