1- A system with a mass of 1923 g has an acceleration of 5.7 [\\frac{m}{s^2}] ms
ID: 1731206 • Letter: 1
Question
1- A system with a mass of 1923 g has an acceleration of 5.7 [ rac{m}{s^2}] ms2? Find the expected net force on the system in newtons.
2- The apparent weight of a object is equal to the objects "true" weight when ________
a- the acceleration of the object is zero
b- in an elevator that is slowing down
c- the object is in an elevator and speeding up
d- the velocity of the object is constant
3- Select all that are correct descriptions of the coefficient of friction.
a-
Its unit in the SI system is the newton
b-
It has no units
c-
A pair of surfaces will have 2 different coefficients
d-
The symbol is a Greek letter
e- the symbol f
4- Select all the statements that are true of Newton's third law pair forces.
a-They point in opposite directions
b-They are different kinds of forces
c-They have the same magnitude
d- They are on the same object
5- The direction of the friction force is _______________. Select all that are true.
a- perpendicular to the normal force
b- in the same direction as the motion when sliding
c- parallel to the normal force
d- it has no direction
e- They are on different objects
6- The normal force is always directed ________________. Select all that apply. (Hint: The object in the possible answers is the object that the force is ON.)
a- parallel to the surface
b- toward the object
e- perpendicular to the surface
f- in a direction that depends on its motion
g- away from the object
Explanation / Answer
1) We have,
F = ma
= 1.923kg * 5.7 m/s2
= 10.9611 N
2) a- the acceleration of the object is zero
3) (b) It has no units.
(d) The symbol is a Greek letter.
4) (a) They point in opposite directions.
(c)They have the same magnitude.
(d) They are on the same object.
5) a- perpendicular to the normal force.
6) e- perpendicular to the surface.
g- away from the object
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