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6th Grade Science - Unit 4 Forces & Motion - Lesson 2 Forces
Terms in this set (30)
a push or pull exerted by one object on another, possibly causing a change in motion
a force that is exerted only when objects are touching
a force exerted when objects are not touching
the combination of all forces acting on an object
forces that act on an object without changing its motion
forces that do not cancel each other out and that cause an object to change its motion
Any push or pull on an object is called a(n)
The sum of all forces on an object is the
Explain the difference between a contact force and a noncontact force.
It is when a force is exerted on an object and it is either touching or not touching
If two students pull a wagon in opposite directions but the wagon does not move, the forces acting on the wagon are: 1. accelerated negatively, 2. unbalanced, 3. accelerating positively, 4. balanced.
What changes when unbalanced forces act on an object? 1. color, 2. mass, 3. motion, 4. weight
How do you find the net force on an object if forces are action on it in the same direction?
you combine them and add
A factor that affects the motion of an object, such as a push or a pull, is a(n)
When a person or object applies a force by touching an object, it is called a9n)
Some forces, known as "what" can be applied to an object without another object touching it.
A spring scale measured force in metric units called
if two or more forces combine to act on an object, the result is the
in a picture, the length of an arrow used to sow a force indicates the force's
If the two combined forces acting on an object are both to the right, the net force will be to the
If one force acting on an object is 200 N to the right and the other is 100 N to the left, the net force will be 100 N to the
If equal forces act in "what" direction on an object the net force is zero
Combined forces with a net force or zero are
An object's motion remains "what" if the forces acting on it are balanced.
The forces acting on stationary objects are always
Balanced forces can act on object that are stationary or "what". If an object is moving with a(n) "what" velocity, the forces acting on it are balanced.
moving objects, constant
Combined forces with a net force that is not equal to zero are called "what?" An object's motion changes if unbalance forces are acting on it.
Give an example in which noncontact forces acting on an object are balanced.
A magnetic object appearing to "float" above another magnet's surface due to the repelling magnetic forces is balanced with the pull of gravity are unbalanced forces.
A car is turning while moving at a constant speed. Are the forces acting on the car balanced or unbalanced?
They are unbalanced because the motion is changing.
What effect do forces have on objects?
They make things move.
Three people push a piano on wheels with forces of 130 N to the right, 150 N to the left, and 165 N to the right. What is the strength and direction of the net force on the piano?
265 N to the right
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