Forces
Friction
Gravity
Magnetism
Push & Pull
100
What is a unbalanced force?
Forces that produce a nonzero net force, which changes an object's motion.
100
What is friction?
Forces that two surfaces excert on each other when they rub against eah other
100
What's the force acting on a watermelon that has been thrown out the window?
Gravity
100
What happens when the north and south pole on a magnet meet?
They are attracted to one another.
100
What is push and pull?
Push is too press with force or to move away. Pull is grabbing something and bringing it to you.
200
What is balanced force?
Equal forces acting on an object in opposite directions.
200
What two things determine the strength of friction?
How hard the surface is and what it is.
200
What is gravity?
Forces that pull objects together.
200
What happens when the north and the north pole meet?
They repel.
200
When two people push with equal force on an object in opposite directions the forces are ______________. (balanced or unbalanced)
balanced
300
What is a force?
A push or pull exerted on an object
300
What type of friction acts on an object that is not moving?
static friction
300
What's the difference in free fall and air resistence?
Free fall goes down air resistence goes up.
300
What is a magnet?
a magnetized piece of iron or steel that attracts iron, nickel, or steel
300
Is a skier being pushed pulled by a boat?
pulled
400
If you are pushing on a box with a friend and the box moves, what kind of force is it?
Unbalanced force
400
How does friction and gravity act on each other?
Friction slows the object and gravity keeps it going.
400
What is the difference between mass and weight?
Mass is how much matter something has in it. Weight is the force of gravity acting on something.
400
What two poles are there on a magnet?
South and North Poles.
400
John pushed a box with 50 newtons of force. Jane pushed on the same box in the opposite direction with 40 Newtons of force. What happened to the box?
The box moved in Jane's direction.
500
What is combination of all forces acting on an object?
Net force
500
What direction does friction act in relation to the object's motion?
Friction acts in a direction opposite the object's motion.
500
What is gravitational potential energy?
Potential energy that depends on the height of the object.
500
What is the region around a magnet where the force of magnetism can be felt?
magnetic field
500
Three children pull on the same toy at the same time, but there is no net force on the toy the toy does not move). How is this possible?
The forces the three children are exerting on the toy balances one another.
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