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Science Concepts chapter 2
Science Concepts chapter 2
20
Science
4th Grade
05/22/2014

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Cards

Term
a push or pull that makes an objects change movement
Definition
force
Term
the force that pulls any two objects toward each other
Definition
gravity
Term
the tendency of a moving object to keep moving or a resting object to stay at rest
Definition
inertia
Term
a force that slows down moving objects
Definition
friction
Term
the ability to do work
Definition
energy
Term
energy of motion
Definition
kinetic energy
Term
what happens when a force makes an object move
Definition
potential energy
Term
something that makes work easier
Definition
machine
Term
You are trying to move a heavy rock. What simpl?e machines could you use to make this task easier
Definition
You could use an inclined plane because it makes a heavy object in a wheelbarrow easier to pull
Term
Two children of equal size and strength are having a tug-of-war. If you are the judge of the contest, how can you tell if either of them has done any work?
Definition
You could tell if they do any work by the rope it is moving.
Term
Forces can make objects stop or start moving, slow down, speed up, or change direction.
Definition
false
Term
Inertia causes a ball to return to Earth after you throw it.
Definition
false
Term
Friction exists whenever two objects rub against each other.
Definition
true
Term
Friction causes objects to move faster or fly higher.
Definition
false
Term
When you begin to slide down a slide, kinetic energy is converted into energy of motion.
Definition

false

 

Term
Potential energy can be converted to kinetic energy.
Definition
true
Term
A car's engine works because of mechanical energy.
Definition
true
Term
When you walk very slowly, you are doing work.
Definition
true
Term
A wheel and axle is an example of a simple machine.
Definition
true
Term
A motorcycle is an example of a complex machine.
Definition
true
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