Unit 5: Force, Mass, Acceleration

Question 1

the force that resists motion

Answer 1

friction

Question 2

the pulling force

Answer 2

tension?

Question 3

the pushing force (ground force)

Answer 3

normal force?

Question 4

the resistance force on a non-moving object

Answer 4

static friction

Question 5

the resistance force on an object in motion

Answer 5

sliding friction

Question 6

objects can be moving and still have a net force of zero if there is no ___________

Answer 6

acceleration

Question 7

forces are classified as one of these two:

Answer 7

contact force
non contact force

Question 8

what is 1kg in Newtons?

Answer 8

1kg = 9.8N

Question 9

what is 1lb in Newtons?

Answer 9

1lb = 4.45N

Question 10

Newton’s 1st Law

Answer 10

the law of inertia
“an object at rest will stay at rest. an object in motion will stay in motion. unless acted upon by an unbalanced force”

Question 11

Newton’s 2nd Law

Answer 11

the law of acceleration
“the greater the mass of an object, the greater the amount of force needed to accelerate the object. F=MxA.”

Question 12

Newton’s 3rd Law

Answer 12

the law of equal and opposite forces
“every action has an equal and opposite reaction”

Question 13

F=

Answer 13

F=MxA

Question 14

M=

Answer 14

M=F/A

Question 15

acceleration=

Answer 15

a=F/m

Question 16

acceleration=

Answer 16

a=change in V over time

Question 17

a Newton is the same thing as…

Answer 17

kg x m/s^2

Question 18

list the four contact forces

Answer 18

1. normal force
2. friction
3. tension
4. elastic

Question 19

list the non contact forces

Answer 19

1. gravity
2. magnetic
3. electricity

Question 20

how do you find weight?

Answer 20

mass times the force of gravity

Question 21

true or false: in order for an object to remain at rest, the friction force must be larger than the applied force

Answer 21

FALSE. the forces can be equal.

Question 22

true or false: static friction is always equal to applied friction

Answer 22

TRUE. Once you overcome an object and start to push it, it changes to sliding friction, so true!

Question 23

If a plane has two forces acting on it, one pushing 200N to the left and one pushing 50N to the right, what is the net force?

Answer 23

150N to the left