## Motion

Question #1: A quantity of 60 km/h describes a property of motion known as
(A). a vector.
(B). acceleration.
(C). velocity.
(D). magnitude of velocity.

Question #2: A ratio of v/t is a measure of motion that is known as
(A). speed.
(B). velocity.
(C). acceleration.
(D). mass density.

Question #3: A ratio of d/t is a measure of motion that is known as
(A). speed.
(B). velocity.
(C). acceleration.
(D). mass density.

Question #4: Ignoring air resistance, an object falling toward the surface of the earth has a velocity that is
(A). constant.
(B). increasing.
(C). decreasing.
(D). acquired instantaneously.

Question #5: Ignoring air resistance, an object falling toward the surface of the earth has an acceleration that is
(A). constant.
(B). increasing.
(C). decreasing.
(D). dependent on the weight of the object.

Question #6: A ball rolling across the floor slows to a stop because
(A). there are unbalanced forces acting on it.
(B). the force that started it moving wears out.
(C). all the forces are balanced.
(D). the net force equals zero.

Question #7: After leaving the rifle, a bullet fired horizontally has how many forces acting on it (ignoring air resistance)?
(A). One, from the gunpowder explosion.
(B). One, from the pull of gravity.
(C). Two, one from the gunpowder explosion and one from gravity.
(D). Three, one from the gunpowder explosion, one from gravity, and one from the motion of the bullet.

Question #8: What is a sprinter's speed if a distance of 200.0 m is covered in 21.4 s?
(A). 9.3454944 m/s
(B). 179 m/s
(C). 0.107 m/s
(D). 9.35 m/s

Question #9: A pitcher throws a ball at 40.0 m/s and the ball is electronically timed to arrive at home plate 0.4625 s later. What is the distance from the pitcher to the home plate?
(A). 0.0116 m
(B). 18.5 m
(C). 86.485 m
(D). 86.5 m

Question #10: What is the velocity of a car that accelerates from rest at 9.0 feet per second squared for 8.0 seconds?
(A). 1.125 ft/s
(B). 0.89 ft/s
(C). 72 ft/s
(D). 17 ft/s

Question #11: A ball thrown straight up climbs for 3.0 seconds before falling. Neglecting air resistance, with what velocity was the ball thrown?
(A). 3.0 m/s
(B). 9.8 m/s
(C). 14.5 m/s
(D). 29 m/s