Force & Heat
Can we see forces?
Can we see actions that cause forces?
no
yes
What kind of force is being applied?
Lifting a pencil.
pull
A push or pull on an object is called ______.
a. motion
b. force
c. physics
b. force
A force cannot change the speed of a moving object.
False
What two things must we apply to metal to make different objects and tools out of it?
heat and force
What kind of force is being applied?
Closing a fridge door.
push
A force that pulls objects to the earth is called ______ force.
gravitational
A force cannot change the direction of a object.
False
Name 2 dangers of changes in objects due to heat and force.
Heat can cause glass to break or can burn us if we touch something that is too hot.
Too much weight on a chair might break it.
Force causes wear and tear on tires.
What kind of force is being applied?
A girl rolling clay.
push
A change in an object's position is called ______.
a. motion
b. force
c. physics
a. motion
If an object is not moving, it will stay there until a force is applied.
True.
Name 2 benefits of changes in objects due to heat.
Heat lets us cook food, dissolve materials in liquids, make different tools and objects out of metal, etc.
What is the definition of stationary?
Not moving.
the _____ of an object is the quantity of matter in it.
a. mass
b. weight
c. gravity
a. mass
An object will continue in motion until another force acts on it.
True.
________ of some objects in water is also a change that is useful to us. We can make drinks from instant coffee powder or hot chocolate powder. We can make soapy solutions from detergents for cleaning.
Dissolution
Name all 5 effects of a push or pull force.
Move a stationary object.
Speed up a moving object.
Slow down a moving object.
Stop a moving object.
Change the direction of a moving object.
________ force slows down moving objects.
a. frictional
b. physical
c. gravitational
frictional
The mass of an object is the gravitational force acting on it.
False. The weight of an object is the gravitational force acting on it. The mass of an object is the amount of matter (stuff) in it.