ECAT MCQs

Weight depends on gravitational field strength.
Mass remains constant while weight may change with location.

Use s=ut+½at².
S=10×5+½×2×25 = 50+25 = 75 m.

A surface exerts a normal force on an object in contact with it.
Its magnitude is not always equal to weight.

Use v²=u²+2as.
100-16 = 42a, so a=2 m/s².

Friction acts tangentially at a contact surface.
It may be static or kinetic.

Starting from rest, v=gt.
V=10×2 = 20 m/s.

Opposite collinear vectors subtract in magnitude.
The resultant magnitude is |12-7| = 5 N.

Displacement is a vector from initial to final position.
It can be zero even when distance traveled is not zero.

Distance is a scalar and depends on the actual path.
It is always nonnegative.

Average speed uses total path length.
It does not depend on direction.

Average velocity is a vector based on net displacement.
A round trip can have zero average velocity.

Slope gives change in displacement per unit time.
That is the definition of velocity.