Question 1

A ball is dropped from rest from the top of a building. Neglecting air resistance, which equation correctly describes the distance $$d$$ the ball falls after time $$t$$?

Accepted Answer

$$d = \frac{1}{2}gt^2$

Question 2

A ball is thrown straight upward with an initial velocity of $$20\ \mathrm{m/s}. $$What is the velocity of the ball at the top of its path?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 3

A projectile is launched horizontally from a table. Which statement is true about its horizontal and vertical motions?

Accepted Answer

Horizontal velocity is constant; vertical velocity increases due to gravity.

Question 4

A ball is thrown downward from a building with an initial velocity $$v_0. $$Which equation gives its velocity $$v$$ after time $$t$$?

Accepted Answer

$$v = v_0$ + gt$$

Question 5

A hunter aims directly at a monkey hanging from a tree. The instant the hunter fires, the monkey lets go and begins to fall. Where should the hunter aim to hit the monkey?

Accepted Answer

Directly at the monkey

Question 6

Which launch angle will give a projectile the greatest horizontal range, assuming no air resistance?

Accepted Answer

$$45^\circ$$

Question 7

A ball is thrown upward with an initial velocity of $$30\ \mathrm{m/s}. $$How long does it take to reach its highest point? (Take $$g = 10\ \mathrm{m/s}^2)$$

Accepted Answer

$$3\ \mathrm{s}$$

Question 8

Which of the following best describes the acceleration of a ball at the top of its path when thrown straight upward?

Accepted Answer

$$10\ \mathrm{m/s}^2$$ downward

Question 9

A ball rolls off a table with three different horizontal velocities: $$v_1$$, $$v_2$$, and $$v_3$$ ($$v_3$$ \u003e $$v_2$$ \u003e $$v_1). $$Which ball hits the ground first?

Accepted Answer

All hit at the same time

Question 10

A projectile is launched at $$30^\circ$$ above the horizontal. Which component of its velocity remains constant (ignoring air resistance)?

Accepted Answer

Horizontal component

Question 11

A ball is dropped from a height of $$20\ \mathrm{m}. $$How long does it take to reach the ground? (Use $$g = 10\ \mathrm{m/s}^2)$$

Accepted Answer

$$2\ \mathrm{s}$$

Question 12

A velocity vs. time graph for a falling object is a straight line with a positive slope. What does the slope of this line represent?

Accepted Answer

The object's acceleration

Question 13

A ball is thrown upward with an initial velocity $$v_0. $$What is the total time the ball spends in the air before returning to the thrower's hand? (Ignore air resistance, $$g is $$acceleration due to gravity)

Accepted Answer

$$\frac{2v_0}{g}$$

Question 14

A bullet is fired horizontally from a rifle at a target. If the bullet takes $$0.5\ \mathrm{s} to $$reach the target, how far does it fall vertically during this time? (Use $$g = 10\ \mathrm{m/s}^2)$$

Accepted Answer

$$1.25\ \mathrm{m}$$

Question 15

Which of the following statements about projectile motion is correct?

Accepted Answer

The vertical and horizontal motions are independent.

Question 16

A ball is thrown straight upward and returns to the thrower’s hand. Which of the following is true about the ball’s velocity and acceleration at the highest point?

Accepted Answer

Velocity is zero; acceleration is downward.

Question 17

A student drops a ball from a window and another student throws a ball downward from the same height with an initial velocity. Which ball reaches the ground first?

Accepted Answer

The thrown ball

Question 18

If a projectile is launched at an angle of $$70^\circ$$ with the same initial speed as one launched at $$20^\circ$$, which will have the greater range (neglecting air resistance)?

Accepted Answer

Both have the same range

Question 19

A ball is thrown horizontally from a $$45\ \mathrm{m}$$ high cliff with a speed of $$10\ \mathrm{m/s}. $$How long does it take to hit the ground? (Use $$g = 10\ \mathrm{m/s}^2)$$

Accepted Answer

$$3\ \mathrm{s}$$

Question 20

Which of the following best explains why a bullet fired horizontally and a bullet dropped from the same height hit the ground at the same time (neglecting air resistance)?

Accepted Answer

Gravity acts equally on both bullets in the vertical direction.

Falling Objects and Projectile Motion: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드