If the acceleration of a mass is zero, then there are no forces acting on it. Th

Question

If the acceleration of a mass is zero, then there are no forces acting on it. The force from the drive train turning the wheels is what accelerates a car, A static friction force on a mass always prevents the mass from moving Earth's gravitational force on you is greater than your gravitational force on the Earth. Sliding on a frictionless incline, a box accelerates more going downhill rather than. On an incline with friction, a sliding box accelerates more going downhill rather than up For contact between two given materials, static friction is stronger than kinetic friction.

Explanation / Answer

1. from newton's 2nd law,

Fnet = m a

if a = 0 then Fnet = 0

but Fnet = F1 + F2 + F3 + .... =0

so there can be many forces on mass but resultant of these will zero.

hecne there can be forces on mass.

False

2. False.

friction accelerates the train.

3. False.

static friction always restricts the motion between the surface.
IN order to attain this , it can also speed up the object .

4. from newton's 3rd law,

action and reaction forces always have same magnitude.

False

5. False.

both have same magnitude but directions will be opposite .

a = g sin(theta)

6. False

downhill. a = (m g sin(theta) - f) / m

uphil;, a = (m g sin(theta) + f) / m

hence a will be greater in the case of uphill.

7. maximum value of static friction is always greater than kinetic friction.

but value of static friction is always vary depens on force on object.

so static friction force can be greater than, equal or less than the kinetic friction.

So statement is true. as static friction can be stronger then kinetic fricrion.

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