Physics Problems – Applications of Circular Motion
Physics Problems – Horizontal Projectiles Name ______________________________
(assume no air resistance)
1) In the absence of air resistance, why does the horizontal component of velocity for a projectile remain constant while the vertical component changes?
2) How does the downward component of the motion of a projectile compare with the motion of free fall?
3) How far below an initial straight-line path will a horizontally launched projectile fall in one second?
Does your answer depend on the initial speed of the projectile? Why or why not?
4) A movie stunt driver on a motorcycle speeds horizontally off a 50.0 m high cliff. How fast must the motorcycle leave the cliff-top if it is to land on level ground below, 90.0 m from the base of the cliff where the cameras are.
5) A child sits upright in a wagon which is moving to the right at constant speed . The child extends her hand and throws an apple straight upward (from her point of view), while the wagon continues to travel forward at constant speed. If air resistance is neglected, will the apple land (a) behind the wagon, (b) in the wagon, or (c) in front of the wagon? Explain.
6) A boy on a small hill aims his water-balloon slingshot horizontally, straight at a second boy hanging from a tree branch a distance d away. At the instant the water balloon is released, the second boy lets go and falls from the tree, hoping to avoid being hit. Show that he made the wrong move. (He hadn’t studied physics yet.)
7) A tiger leaps horizontally from a 7.5 m high rock with a speed of 4.5 m/s. How far from the base of the rock will she land?
8) A diver running 1.6 m/s dives out horizontally from the edge of a vertical cliff and reaches the water below 3.0 s later. How high was the cliff?
How far from its base did the diver hit the water?
9) A ball is thrown horizontally from the roof of a building 56 m tall and lands 45 m from the base. What was the ball’s initial speed?
10) A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. If the plane is traveling horizontally with a speed of 250 km/hr (69.4 m/s) how far in advance of the recipients (horizontal distance) must the goods be dropped?
11) A physics student wishes to determine the speed a slingshot imparts to a rock. How can this be done using only a tape measure, a rock, and the slingshot? (a calculator may be helpful, too!)
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