Motion in 1 & 2 Motion in 1 & 2 Dimensions Dimensions

REVIEWREVIEW

What is the displacement of an What is the displacement of an object with a v vs. t graph of:object with a v vs. t graph of:

A.A. 15 m15 m

B.B. 15 cm15 cm

C.C. -15 m-15 m

D.D. 0.83 m0.83 m

E.E. -0.83 m-0.83 m

What is the acceleration of an What is the acceleration of an object with a v vs. t graph of: object with a v vs. t graph of:

A.A. 15 m/s15 m/s22

B.B. 15 cm/s15 cm/s22

C.C. -15 m/s-15 m/s22

D.D. 0.83 m/s0.83 m/s22

E.E. -0.83 m/s-0.83 m/s22

What best describes the motion of the What best describes the motion of the object during the time interval of 4.0 s – object during the time interval of 4.0 s –

6.0 s? 6.0 s?

A.A. Constant forward Constant forward velocityvelocity

B.B. Constant Constant negative velocitynegative velocity

C.C. No motionNo motion

D.D. Constant Constant accelerationacceleration

A tortoise runs 4 meters forward in 3.5 A tortoise runs 4 meters forward in 3.5 sec and then turns around sec and then turns around

(instantaneously) and runs back to (instantaneously) and runs back to where it started in another 4.0 sec. where it started in another 4.0 sec.

What is the tortoise's What is the tortoise's average average velocityvelocity? ? A.A. 0 m/s0 m/s

B.B. 1.1 m/s1.1 m/s

C.C. 2.1 m/s2.1 m/s

D.D. -2.1 m/s-2.1 m/s

A tortoise runs 4.0 meters forward in A tortoise runs 4.0 meters forward in 3.5 sec and then turns around 3.5 sec and then turns around

(instantaneously) and runs back to (instantaneously) and runs back to where it started in another 4.0 sec. where it started in another 4.0 sec.

What is the tortoise's What is the tortoise's average average speedspeed? ? A.A. 0 m/s0 m/s

B.B. 1.1 m/s1.1 m/s

C.C. 2.1 m/s2.1 m/s

D.D. -2.1 m/s-2.1 m/s

A man walks 3.5 m North, 6.9 m West A man walks 3.5 m North, 6.9 m West and then 2.4 m South. What is his final and then 2.4 m South. What is his final

displacement? displacement?

A.A. 12.8 m12.8 m

B.B. 7.0 m at 817.0 m at 81oo N of W N of W

C.C. 7.0 m at 817.0 m at 81oo W of N W of N

D.D. 7.0 m at 97.0 m at 9oo S of E S of E

Which of the following is an Which of the following is an example of projectile motion? example of projectile motion?

A.A. Wonder Woman flying through the Wonder Woman flying through the air.air.

B.B. A volleyball pounded over the net.A volleyball pounded over the net.

C.C. A paper airplane gliding through A paper airplane gliding through the air.the air.

D.D. An airplane traveling from LA to An airplane traveling from LA to Dallas.Dallas.

A rubber suction cup is fired A rubber suction cup is fired horizontally from a toy gun, and horizontally from a toy gun, and

another rubber suction cup is dropped another rubber suction cup is dropped simultaneously from the same height. simultaneously from the same height. Neglecting air resistance, which bullet Neglecting air resistance, which bullet

hits the ground first? hits the ground first? A.A. The fired one.The fired one.

B.B. The dropped one.The dropped one.

C.C. Both hit at the same time.Both hit at the same time.

A battleship simultaneously fires two A battleship simultaneously fires two shells at enemy ships. If the shells shells at enemy ships. If the shells follow the trajectories shown, which follow the trajectories shown, which

ship gets hit first? ship gets hit first? A.A. A will be hit first.A will be hit first.

B.B. B will be hit first.B will be hit first.

C.C. Both will be hit at the same time.Both will be hit at the same time.

D.D. It depends on the actual angles.It depends on the actual angles.

Two arrows are launched with the same velocity. Two arrows are launched with the same velocity. One is launched straight up and the other is One is launched straight up and the other is launched at 65launched at 65oo. Which hits the ground first? . Which hits the ground first?

A.A. The one launched straight up.The one launched straight up.

B.B. The one launched at 65The one launched at 65oo..

C.C. Both hit at the same time.Both hit at the same time.

D.D. Need more information.Need more information.

Does a ball dropped out of the window Does a ball dropped out of the window of a moving car take longer, shorter, or of a moving car take longer, shorter, or the same amount of time to reach the the same amount of time to reach the ground as one dropped at the same ground as one dropped at the same

height from a car at rest? height from a car at rest? A.A. LongerLonger

B.B. ShorterShorter

C.C. The sameThe same

One penny is thrown upwards at a One penny is thrown upwards at a velocity , V, from the top of a building velocity , V, from the top of a building

and another penny is thrown and another penny is thrown downwards from the top of the same downwards from the top of the same

building at a velocity of –V. Which hits building at a velocity of –V. Which hits the ground first? the ground first?

A.A. The one thrown upwards.The one thrown upwards.

B.B. The one thrown downwards.The one thrown downwards.

C.C. They both hit at the same time.They both hit at the same time.

One penny is thrown upwards at a One penny is thrown upwards at a velocity , V, from the top of a building velocity , V, from the top of a building

and another penny is thrown downwards and another penny is thrown downwards from the top of the same building at a from the top of the same building at a

velocity of –V. Which hits the ground with velocity of –V. Which hits the ground with the largest final velocity? the largest final velocity?

A.A. The one thrown upwards.The one thrown upwards.

B.B. The one thrown downwards.The one thrown downwards.

C.C. The final velocities are the same.The final velocities are the same.

Which ball spends the most Which ball spends the most time in the air?time in the air?

A.A. Ball ABall A

B.B. Ball BBall B

C.C. They are They are the same.the same.

Which ball has the greater Which ball has the greater launch speed? launch speed?

A.A. Ball ABall A

B.B. Ball BBall B

C.C. They are the They are the same.same.

Assuming air resistance is negligible, Assuming air resistance is negligible, what happens to the horizontal what happens to the horizontal velocity of a projectile after it is velocity of a projectile after it is

released?released?A.A. Velocity decreases.Velocity decreases.

B.B. Velocity increases.Velocity increases.

C.C. Velocity remains constant.Velocity remains constant.

A passenger on a bus moving east sees a A passenger on a bus moving east sees a man standing on a curb. From the man standing on a curb. From the passenger’s perspective, the man passenger’s perspective, the man

appears to be… appears to be… A.A. Not moving.Not moving.

B.B. Moving East with a speed equal to the Moving East with a speed equal to the bus’s speed.bus’s speed.

C.C. Moving North with a speed equal to the Moving North with a speed equal to the bus’s speed.bus’s speed.

D.D. Moving West with a speed equal to the Moving West with a speed equal to the bus’s speed.bus’s speed.

A piece of candy is dropped by a little girl A piece of candy is dropped by a little girl running across the yard. From an running across the yard. From an

observer’sobserver’s perspective, the candy perspective, the candy appears to fallappears to fall

A.A. Straight down.Straight down.

B.B. Parabolically forward.Parabolically forward.

C.C. Parabolically backward.Parabolically backward.

D.D. Straight backward.Straight backward.