Forces
What is a force?
Any push or pull on an object.
What is gravity?
Gravity is a force that pulls things towards each other.
What is magnetism?
A force that makes certain things attract or repel each other.
What is electrostatic force?
A push or pull between things that have electric charges.
A compass works because of?
Magnetism
A pushing force.
What causes things to fall?
Gravity
What are the poles on a magnet?
What real life object uses this force?
Photocopiers
How does the distance from a magnet to a magnetic object affect the strength?
The further you move the magnet from the magnetic object it gets weaker and the closer you move it to the object the stronger it gets.
Playing tug of war is an example of which force?
Pulling force.
What is a real life example of gravity?
Jumping on a trampoline, leaves falling, apples falling
Which materials are magnetic?
Iron, nickel, cobalt
What causes lightning?
A build up of charges in clouds that attract to objects on Earth.
Who is the best Grade 4 teacher?
Mrs. Kelly
What is a non-contact force?
A force that doesn’t make contact with an object moves it.
Gravity is the reason the Earth orbits ________
The sun.
What real life object uses this force?
Hard drives, fridge magnets, bank cards
Why does you hair stand up after rubbing a balloon on it?
The rubbing causes negative charges to move from your hair to the balloon. The opposite charges in your hair attract to the balloon.
Explain how a compass works?
A compass has a small magnet inside that can spin freely. This magnet is attracted to Earth's magnetic field, so it always points North and South.
What is a contact force?
A force that makes contact with an object to move it.
Who discovered gravity?
A scientist named Sir Isaac Newton.
How can you make a steel nail magnetic?
You can rub a magnet in one direction on a steel nail and make it magnetic by changing the charge.
Name an experiment we did for static electricity.
Many answers
How does gravity explain the world around us?
It explains why we stay on the ground instead of floating into space, and why the moon orbits around the Earth. It shows us how everything in the universe is connected by this force.