module 4- friction gravity and momentum

Question 1

friction

Answer 1

the force that opposes the motion of an object on which it acts.

Question 2

kinetic friction

Answer 2

the force of friction between 2 objects that are moving against each other

Question 3

static friction

Answer 3

occurs between 2 objects that are touching each other but not moving against each other.
the force that prevents the 2 object from starting to move.

Question 4

gravity

Answer 4

gravity acts to pull objects closer to each other.

- gravity is an attractive force that exists between any objects with mass.

Question 5

linear momentum

Answer 5

the mass of an object times its velocity

p=mv

Question 6

the law of conservation of momentum

Answer 6

states that momentum is conserved when two or more object collide.
in other words momentum may be transferred from one object to another but total momentum within the group objects will stay the same.

Question 7

elasticity

Answer 7

the amount of bounce that an object has after a collision

Question 8

kinetic energy

Answer 8

is the energy possessed by a body due to its motion.

the faster the body moves, the greater the kinetic energy