forces Flashcards
1
Q
define forces
A
it is a push or pull one object exerts on another
2
Q
what can a force do
A
-start or stop the motion of an object
-change the size or shape of an object
-increase or decrease the speed of a moving object
-change the direction of motion of a moving object
3
Q
classify forces
A
objects in contact
-friction
-elastic spring force
objects at a distance
-magnetic force
-gravity
4
Q
what is friciton
A
friction is a force that exists between surfaces that are rubbing against each other
5
Q
T/F friction is bad
A
false
friction can reduce slipping and sliding, allow us to control movement and also can produce heat
6
Q
how to reduce friction
A
-put lubricants
-add ball bearings
7
Q
T/F amount of gravity can change
A
true
if mass changes, the amt of gravity acting on u changes
