Kinematics II: (Vectors and Projectiles) Review

A vector is a quantity that has...

• magnitude and time

• magnitude and direction

• time and direction

• magnitude only

A girl with nothing to do walks 200 km east in a few hours. After a brief rest, she walks another 100 km east. Finally, she turns and walks 40 km west. What is her displacement from her starting point?

• 340 km east

• 260 km east

• 300 east

• 340 west

Tarzan is hanging from one of his vines. His weight is 210 newtons. A boy pushes Tarzan with a force of 90 newtons. The vine can withstand a 225 newton force. What is the resultant? and what will happen to Tarzan?

• 300 newtons, the vine will break

• 228.47 newtons, the vine will break

• 15 newtons, Tarzan will not move

• 315 newtons, Tarzan will fly off the vine

Tags

NGSS.HS-PS2-1

An airplane flies to New York with a velocity of 375 km/h, N. The plane encounters a cross wind with a velocity of 60 km/h, W. What is the plane's resultant velocity?

• 144,225 km/h

• 435 km/h

• 379.8 km/h

• 72,112 km/h

A bird flies south to Florida at 35 km/h, S. If the bird experiences a crosswind with a velocity of 12 km/h, E. What is the bird's new velocity?

• 23 km/h

• 1369 km/h

• 47 km/h

• 37 km/h

Marcie pulled her dog forward on a snow sled with a force of 50 N. At the same time Tommy pushes the snow sled from behind with a force of 28 N. What is the total force exerted on the snow sled?

• 78 N, East

• 22 N, West

• 0 N, the sled won't move

• 57.3 N, East

Tags

NGSS.HS-PS2-1

Lynn is driving home from work and finds that there is road construction being done on her favorite route so she must take a detour. Lynn travels 5 km north, 6 km east, 3 km south, 4 km west, and 2 km south. What was here total displacement covered in km?

• 20 km

• 10 km

• 0 km

• 2 km

Esther jumps forward off a spring board with a force of 6 N. The spring board pushes her off in the same direction with a force of 12 N. What is the total force exerted by Esther diving off the board and the spring board itself?

• 18 N

• 6 N

• 12 N

• 72 N

Tags

NGSS.HS-PS2-1

Avery sees a UFO and calls to report it. She says the UFO was spotted 20 miles east, and then flew another 30 miles south. What is the resultant of the UFO?

• 50 miles

• 36 miles

• 10 miles

• 100 miles

A girl throws a ball straight up into the air with a velocity of 22.7 m/s. What is the final velocity of the ball at the top of its trajectory?

• 0 m/s

• 22.7 m/s

• 9.8 m/s

• 222.46 m/s