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Interactive Science ~ Grade 5 ~ Chapter 11 Forces & Motion
Terms in this set (36)
a push or pull that acts on an object. It has a strength, direction, and change the way objects move.
is the force that results when two materials rub against each other or when their contact prevents sliding (makes it harder for one surface to move across the other)
Every force has ______ and ________
strength and direction
a force that requires two pieces of matter to touch
an example is pushing a chair
a force that acts at a distance
What are three examples of non-contact force?
gravity, electric forces, magnetic forces
force of attraction between any two objects; every object in the universe exerts a pull on every other object
Weight of an object
force of the Earth's pull on that object
force that happens between two objects that are electrically charged
example of electric forces
force between magnetic objects made of metal (like iron, cobalt, nickel)
Every magnet has a north and south _____
Magnetic force is greatest at
the rate at which the speed or direction of motion of an object changes over time
simple machine made of one or two inclined planes Example : axe
simple machine consisting of a rope or cable that runs around a grooved wheel. It changes the direction of the force needed to do work.
the tendency of an object to resist any change in motion (example : what makes your body rise up from seat when the car goes over a speed bump)
a machine made up of one or two parts that helps you do work by changing the amount of force required
simple machine consisting of a smooth cylinder with a tiny inclined plane wrapped around it
Wheel and Axle
simple machine made up of a circular object attached to a bar. Example : steering wheel
simple machine consisting of a flat surface with one end higher than the other. Example : ramp
a simple machine in which a bar moves around a fixed point called a fulcrum
Examples are a nutcracker or seesaw
British scientist who created laws of motion and defined force
motion that does not change (motion without acceleration--like a train traveling at a steady speed on a track)
Newton's First Law
an object will stay in uniform motion unless a net force acts on the object. Without that force, an object at rest will stay at rest. An object in motion will keep the same speed and direction.
Newton's Second Law
~ the greater the mass of an object, the smaller its change in motion will be for a given force.
Example : Larger masses are harder to accelerate and harder to stop.
~ the greater the force applied, the greater the change in motion for a given mass
Example : a large force will produce more acceleration than a small force acting on the same object
Newton's Third Law
when one object exerts a force on a second object, the second object exerts a force on the first. These forces are equal in strength and opposite in direction (opposite but equal reaction)
Example : Bumper cars
When an object is already moving, forces can make the object
speed up, slow down, or change direction
The strength of a force is measured in
True or False : Air and water can also cause friction?
True. Air and water can also resist motion when an object pushes against them.
As an object moves away from Earth, the object weighs more or less?
Less because the pull of earth's gravity because weaker with distance
Objects with the same charge
"Repel" or move away from each other
Objects with opposite charge
are attracted to each other
The force that you use when you do work
A simple machine can (list three)
- Increase or decrease your input force
- Change its direction
- Cause it to move an object a longer or shorter
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