Changes in Force & Motion
_______ force is needed to move objects of larger mass.
More
For every action there is ______ and opposite reaction.
an equal
Light, sound, heat, and motion are indicators that an object has _________.
energy
A compass points north because of the Earth's ________ field?
magnetic
Mass is the amount of _____ that makes up an object.
matter
An object's motion won't change unless acted on by a _________
force
A rocket launches because of an ______ reaction.
an opposite reaction
True or False: Kinetic energy CANNOT be converted to potential energy.
False
What is the area around an object that can attract or repel other objects in that area?
Magnetic Field
The gravitational force between Earth and the Sun causes ______.
Earth's orbit
The force that pulls objects down towards the center of the Earth.
Gravity
______________ forces do not affect the movement of an object.
If you want to increase an object’s potential energy, what two things could you change?
You could increase the height of the object’s position or increase the mass of the object.
Which type of charge would be attracted to a positively charged object?
Only negative
______ wrote the universal law of gravity.
Isaac Newton
This force is caused by air and slows things down.
Air Resistance
Objects in motion tend to stay in motion, while objects at rest, tend to _____________.
stay at rest
When the _____ energy of an object changes, energy is transferred to or from the object.
Kinetic
When magnetic poles that are_____ align, they will have an attractive force.
When magnetic poles that are opposites align, they will have an attractive force
The farther apart two objects are, the _______ the gravitational force.
weaker
What can cause a change in an object’s motion?
the sum of the forces on the object and the mass of the object.
A _________ is the unit of measurement for force.
Newton (N)
Kinetic energy _____ as speed ____.
Kinetic energy increases as speed increases.
Electric fields are usually created when _____ are transferred between objects.
electrons
Why do the planets and other celestial objects in our solar system revolve around the Sun?
The Sun has the greatest mass of any object in the solar system. As such, everything else will be attracted toward it.