module 3- force and motion

Question 1

speed

Answer 1

describes how fast an object is moving.

- this is equal to distance traveled divided by the time needed to cover that distance. ex (m/s; mi/hr.)

Question 2

velocity

Answer 2

speed and direction. in physics velocity tells you how fast and in what direction something is moving

Question 3

acceleration

Answer 3

a change in the objects velocity

• when acceleration is in the same direction as velocity, speed increases.
• when acceleration is in the opposite direction from velocity speed decreases.

Question 4

Force

Answer 4

a push or pull

• measured by newtons (N)
• to calculate forces yo either add the forces going the same direction or subtract the forces going in opposite.

Question 5

balanced forces

Answer 5

forces that combine to produce a net force of zero

Question 6

newtons first law

the law of inercia

Answer 6

the tendency to keep the same motion.

until there is a change in the net force

Question 7

net force

Answer 7

• the total force acting on an object

- the sum of forces acting together. same direction add or opposite direction subtract

Question 8

Newton second law of motion

Answer 8

The acceleration (change)produced by the net force on an object is proportional to the net force, and inversely proportional to the mass. 
- force is proportional to acceleration (ex.big force=big accele.) 
-big mas big=big force
-small mass=small force
small mass=more accelerat.
big mass=small acceler.

Question 9

equation 2nd law of motion

Answer 9

acceleration=netforce/mass
or
Fnet=ma

Question 10

newtons 3rd law of motion

Answer 10

states that whenever one object (the hand, in this case) exerts a force on a second object (the block), the second object exerts a force of the same magnitude in the opposite direction on the first object. (its a force that objects exert on each other)