Force and Motion Test 10/11 Flashcards
Force
a push or pull
Magnetism
attraction to a magnet
Gravity
a force that pulls objects toward each other and pulls objects down to Earth
Friction:
a force that works against (resists)motion; a contact force such as gravel vs ice
Attract:
pull together
Repel:
push apart
Independent variable
variable that is changed by the scientist
example - mass, distance, height, size
dependent variable
results from the change and can be measured or observed
constant
things kept the same in an investigation to ensure reliable and accurate results
Equal or balanced forces
do not result in change motion or speed; A = B,
unequal or unbalanced forces
forces are unequal A > B, result in motion or speed, more than 0
Student pulled a 100-gram block across 4 different surfaces. How does each surface affect the force needed to move block:
What is the independent variable
surface
Student pulled a 100-gram block across 4 different surfaces. How does each surface affect the force needed to move block:
What is the dependent variable
force
Student pulled a 100-gram block across 4 different surfaces. How does each surface affect the force needed to move block:
What are the constants: (3)
block
mass of block
spring scale
Forces can cause, stop, or slow down _________.
a)pushes and pulls
b)animation
c)motion
c)motion
Gravity is a force that _________________.
a) pushes us down to Earth’s surface
b)pulls us down to Earth’s surface
c)slows us down on Earth’s surface
b)pulls us down to Earth’s surface
List two categories of force
1) contact
2) non-contact
When the south ends of two magnets are near each other, the magnets _________.
a)repel
b)attract
c)lose their magnetism
a) repel
When a child placed the red north end of the magnet near the blue south end of the magnet on the toy car, the toy car __________.
a)moved backward
b)moved forward
c)shook back and forth in place
b) move forward
List magnetic metals (4)
steel
iron
nickel
cobalt
Friction:
rough surface = _____ friction
smooth surface = _____ friction
more
less
Define contact
touching to work
Define non contact
does not require contact to work; force fields such as magnet
What type of force is electric
force that can be recharged
What is friction
force that makes object slow down
List four types of forces
1) gravity
2) electric
3)magnetism
4)friction
Inertia
first law of motion: objects like to keep doing what they are doing. example if object is still it will stay still unless someone forces to move
Force and acceleration
2nd law of motion: the bigger the force to push or pull an object - the faster it will move;
heavier objects harder to move.
Force is equal to:
mass times acceleration
Action and reaction
3rd law of motion: every action (push or pull) results in equal and opposite reaction
