Kinematics

What is Kinematics?

• The study of motion without reference to forces and masses.

• The measure that separates two points.

• A course taken by an object.

• Ratio between time and speed.

A car is NOT accelerating if it is moving

• at constant velocity

• only as influenced by gravity

• in a circle

• at increasing speed

A drag racer accelerates from rest at a rate of +7.2 m/s² for +125.0 m. What equation do you need to find his final velocity?(v= the change in velocity)(d=displacement)

• a=v/t

• v_f²=v_i²+2ad

• d=0.5(v_i+v_f)t

• d=v_it+0.5at²

• v_f=v_i+at

An object accelerates from rest, with a constant acceleration of 8.4 m/s2 , what will its velocity be after 11s? (v= the change in velocity)(d=displacement)

• a=v/t

• d=v_i(t)+1/2a(t²)

• v_f²=v_i²+2ad

• d=[(v_i+v_f)/2]t

The observation deck of tall skyscraper 370 m above the street. Determine the time required for a penny to free fall from the deck to the street below. (d=the displacement) (v= the change in velocity)

• a=v/t

• v_f²=v_i²+2ad

• d=0.5(v_i+v_f)t

• d=v_it+0.5at²

• v_f=v_i+at

A bowling ball is dropped on the Jupiter from a height of 3 meters with an initial velocity of 0.4 m/s. The acceleration of gravity on Jupiter is 24.5 m/s2 . How long does it take for the bowling ball to reach the surface of Jupiter?

(d=the displacement) (v= the change in velocity)

• a=v/t

• v_f²=v_i²+2ad

• d=0.5(v_i+v_f)t

• d=v_it+0.5at²

• v_f=v_i+at

Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation

• increases

• decreases

• increase initially, then remains constant

• decreases initially, then remains constant