Projectile Motion Worksheet

At what point in its path is the horizontal component of the velocity (v_x) of a projectile the smallest?

• The instant it is thrown

• Halfway to the top.

• At the top.

• As it nears the top.

• It is the same throughout the path.

At what point in its path is the vertical component of the velocity (v_y) of a projectile the smallest?

• The instant it is thrown

• Halfway to the top.

• At the top.

• As it nears the top.

• It is the same throughout the path.

Big Bubba has a mass of 100 kg on the earth. What is Big Bubba's mass on the moon where the force of gravity is approximately 1/6-th that of Earth's?

• 100 kg

• 16.7 kg

• 600 kg

• 0 kg

The amount of net force required to keep a 5-kg object moving rightward with a constant velocity of 2 m/s is _____

• 0 N

• 0.4 N

• 2 N

• 2.5 N

• 5 N

For an object resting upon a non-accelerating surface, the normal force is equal to the weight of the object.

• True

• False

Which one(s) of the following force diagrams depicts an object moving to the right with a constant speed? Select all that apply.

• a

• b

• c

• d

According to Newton's third law, every force is accompanied by an equal and opposite reaction force. The reason that these forces do not cancel each other is ____.

• the action force acts for a longer time period

• the two forces are not always in the same direction

• one of the two forces is greater than the other

• the two forces act upon different objects; only forces on the same object can balance each other.

• nonsense! They do cancel each other. Objects accelerate because of the presence of a third force.

A helicopter must have two sets of blades in order to fly with stability.

• Third Law (action-reaction)

• First Law (inertia)

• Second Law (force and acceleration)

• Law of Conservation of Energy

Pick which of Newton's most governs the situations described below.

You usually jerk a paper towel from a roll in order to tear it instead of pulling it smoothly.

• First Law (inertia)

• Second Law (force and acceleration)

• Third Law (action-reaction)

• Law of Universal Gravitation

Pick which of Newton's most governs the situations described below.

A student's desk changes the amount of force it puts on other objects throughout a school day.

• Third Law (action-reaction)

• First Law (inertia)

• Second Law (acceleration)

• Law of Conservation of Energy