Forces #1
A push or pull that moves objects
force
When we open a door, we use a _______________ force.
pull
The higher an object is, the more ______ engery it has.
potential
Name the two kinds of energy.
Potential/stored
Kinetic/motion
What does velocity refer to?
speed and direction
A force used to make objects come closer to us
pull
When we shut a window, we use a ______ force.
push
Friction slows objects down. It also causes _____ and _____.
Heat and sound.
Which is not an example of a collision, causing energy transfer and a change in motion.
1. A butterfly flying
2. Hitting a golf ball with a club
3. A bowling ball hitting pins
4. Ocean waves knocking down a sandcastle
1. A butterfly flying
They have a high mass, and that gives them more inertia. They want to stay at rest, so it takes more force to push them.
A force used to make objects move further away from us
push
Forces acting upon an object are unequal and result in motion
unbalanced force
The tendency of an object to resist a change in motion or rest, to stay as it was.
inertia
What is mass?
the amount of matter that makes up an object
Which would cause more damage if it collided with another object, a race car or a bike? Why?
The race care, it can go much faster, which means it has more kinetic energy. Also, it would have more inertia and be harder to stop.
Rocket launch: The upward thrust from the engines is much greater than the downward pull of gravity, causing the rocket to lift off. Is this a balanced or unbalanced force?
unbalanced
Forces acting upon an object are equal and in the opposite direction, objects remain at rest
balanced force
When a collision happens, what kind of energy can be transferred from one object to another?
Kinetic
The rate of change in the velocity of an object is called?
Acceleration
A force pulling objects down to Earth’s surface is called?
gravity
When an object moves from one place to another
motion
A person pushing against a wall is an example of what kind of force? Balanced or unbalanced?
balanced
An object with more mass, like a garbage truck will have ______ inertia than a small car like jeep. (more/less)
more
The more mass an object has, the more or less force it will take to move it?
more
Name an amusement park ride that uses gravity, friction, potential energy, and kinetic energy, and explain how gravity is being used.
rollercoasters, free fall rides, etc... Gravity pulls the ride down, after a motor sent it up.