QUESTION 1 A 250-g cart on a track feels three forces as follows: F1 = 12 N, F2

Question

QUESTION 1

A 250-g cart on a track feels three forces as follows: F1 = 12 N, F2 = -34 N, and F3 = 7 N.

a) What is the net force on the cart?

b) What is the cart's acceleration?

c) If the cart starts from rest, what is the displacement of the cart along the track after 5 s (assuming the track is long enough)?

d) What new force could we add (F4) that would make sure the cart stays at rest instead of acceleratin

QUESTION 2 In a careful, thought-out manner, use at least one of Newton's Laws to argue why any object that changes the direction of its motion MUST be feeling a non-zero net force.

Explanation / Answer

net force=F1+F2+F3=-15 N

b)acceleration=force/mass=-60 m/s^2

c)displacement=0*5+0.5*(-60)*5^2=-750 m

d)we need total force to be 0.

so F4=-(F1+F2+F3)=15 N

Q2. newton's first law:
without application of external force, a moving object cant change its direction.
hence we need a net non-zero force.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.