Unit 5: Force, Mass, Acceleration Flashcards

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1
Q

the force that resists motion

A

friction

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2
Q

the pulling force

A

tension?

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3
Q

the pushing force (ground force)

A

normal force?

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4
Q

the resistance force on a non-moving object

A

static friction

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5
Q

the resistance force on an object in motion

A

sliding friction

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6
Q

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

A

acceleration

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7
Q

forces are classified as one of these two:

A

contact force
non contact force

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8
Q

what is 1kg in Newtons?

A

1kg = 9.8N

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9
Q

what is 1lb in Newtons?

A

1lb = 4.45N

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10
Q

Newton’s 1st Law

A

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”

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11
Q

Newton’s 2nd Law

A

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

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12
Q

Newton’s 3rd Law

A

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

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13
Q

F=

A

F=MxA

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14
Q

M=

A

M=F/A

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15
Q

acceleration=

A

a=F/m

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16
Q

acceleration=

A

a=change in V over time

17
Q

a Newton is the same thing as…

A

kg x m/s^2

18
Q

list the four contact forces

A
  1. normal force
  2. friction
  3. tension
  4. elastic
19
Q

list the non contact forces

A
  1. gravity
  2. magnetic
  3. electricity
20
Q

how do you find weight?

A

mass times the force of gravity

21
Q

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

A

FALSE. the forces can be equal.

22
Q

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

A

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

23
Q

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?

A

150N to the left