Equilibrium

Question 1

If the sum of all the ____ acting on an object equal 0, the object is said to be in equilibrium

Answer 1

If the sum of all the VELOCITIES acting on an object equal 0, the object is said to be in equilibrium

Question 2

____ equilibrium is when all velocities equal 0

Answer 2

STATIC equilibrium is when all velocities equal 0

Question 3

____ equilibrium is when all velocities are constant

Answer 3

DYNAMIC equilibrium is when all velocities are constant

Question 4

The sum of the magnitudes of upward forces equals the sum of the magnitudes of ____ forces
The sum of the magnitudes of rightward forces equals the sum of the magnitudes of ____ forces

Answer 4

The sum of the magnitudes of upward forces equals the sum of the magnitudes of DOWNWARD forces
The sum of the magnitudes of rightward forces equals the sum of the magnitudes of LEFTWARD forces

Question 5

If a system is not in equilibrium one of it’s parts is ____

Answer 5

If a system is not in equilibrium one of it’s parts is ACCELERATING

Question 6

Torque (τ) is defined as: ____

Unit: ____

Answer 6

Torque (τ) is defined as: τ = Fr sinθ

Unit: Joules (Nm)

Question 7

τ = Fr sinθ

τ - ____
F - ____
r - ____
sinθ - ____

Answer 7

τ = Fr sinθ

τ - TORQUE
F - FORCE
r - DISTANCE to mass
sinθ - ANGLE between F and r

Question 8

τ ____ = τ ____

Answer 8

τ CLOCKWISE = τ COUNTER-CLOCKWISE

Question 9

Lever arm is defined as: ____

Unit: ____

Answer 9

Lever arm is defined as: τ = Fl

Unit: Joules (Nm)

Question 10

Lever arm (l) is a ____ that forms a ____° angle from the point of rotation to the point the force is applied

Answer 10

Lever arm (l) is a VECTOR that forms a 90° angle from the point of rotation to the point the force is applied