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Gravity, electricity and magnetism are examples of __________ forces.
non-contact
Your weight changes depending on where you are, but your __________ doesn't.
mass
Friction is a __________ force that occurs whenever two surfaces are touching one another.
contact
Is it easier to stop a bike on a sunny day or a rainy day?
It's easier to brake on a sunny day, ground is slippery on rainy days, so you get less friction = harder to stop.
Main difference between mass and weight is...
Weight is a force!
Why is increasing friction in car tyres a good thing?
Tire treads are carefully engineered to grip the road so the car can steer and turn safely. With tires, friction is a good thing.
Give some examples of slow motion
Some really slow motions could be a plant growing, a glacier sliding or a snail moving. No matter how slow motion is, it's still motion
Give some examples of fast motion
Fast motion could include the flapping of a bee's wings, a cheetah running, an airplane flying or a speaker vibrating.
How does rubbing two sticks cause a fire?
The force of friction between the sticks creates heat, and when it gets hot enough , a fire starts
If two identical boxes were pushed on Cement road, and other on Ice , which will move faster and why?
The force of friction between the box and the ice is less than the force of friction between the box and the cement. Box on Ice moves faster
What is the type of force when 2 surfaces rub together?
Friction
What device is used to measure force?
Spring Balance
What 2 things affect gravity?
Mass and Distance
Who discovered gravity?
Isaac Newton
The more matter something has, the less the force of its gravity. is this true or false?
It is false because The more matter something has, the greater the force of its gravity.
Is there a force of attraction (gravity), between the Sun, Earth, and the moon?
Yes, that is the reason they do not fly off, and they remain in their orbit
How does Gravity affect things that are thrown in different directions?
Gravity pulls things down no matter what direction they are traveling.
What would happen without Gravity?
People (and everything else on Earth) could just float away into space.
What is Gravity?
Gravity is an invisible force that pulls everything to the center of the earth
When two teams are playing tug of war and neither team wins. What is said of the forces?
They are balanced
How do we describe force?
A push or a pull
What are the two forces that stop an object in motion?
Gravity, friction
What is mass measured in?
kg, kilograms
What is force measured in?
Newtons
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