PHY2048C Quizzes 1-5

1. If you set the cruise control of your car to a certain speed and take a turn, the speed of the car will remain the same. Is the car accelerating?

• Mostly

• No

• Yes

• A Little

 While an object is in projectile motion (with upward being positive) with no air resistance

• The horizontal component of its velocity remains constant and the horizontal component of its acceleration is equal to -g.

• 1. The horizontal component of its velocity remains constant and the vertical component of its acceleration is equal to -g. 

• 1. The horizontal component of its velocity remains constant and the vertical component of its acceleration is equal to zero. 

• 1. The vertical component of both its velocity and its acceleration remain constant. 

• 1. The vertical component of its velocity remains constant and the vertical component of its acceleration is equal to -g.

 For general projectile motion, when the projectile is at the highest point of its trajectory

• 1. Its acceleration is zero. 

• 1. Its velocity is perpendicular to the acceleration.

• 1. Its velocity and acceleration are both zero.

• 1. The horizontal component of its velocity is zero. 

• 1. The horizontal and vertical component of its velocity are zero.

A monkey is sitting at the top of a tree 20 m above ground level. A person standing on the ground wants to feed the monkey. He uses a bow and arrow to launch the food to the monkey. If the person knows that the monkey is going to drop from the tree at the same instant that the person launches the food, how should the person aim the arrow containing the food? Air resistance is small enough to be ignored. 

• He should aim it at the monkey.

• He should aim it below the monkey.

• He should aim it above the monkey.

Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down from the edge, but Alice takes a running start and jumps with an initial horizontal velocity of 25 m/s. Neither person experiences any significant air resistance. Compare the times it takes each of them to reach the lake below. 

• Alice reaches the surface of the lake first.

• Tom reaches the surface of the lake first.

• Alice and Tom will reach the surface of the lake at the same time.

 Uniform circular motion: For an object in uniform circular motion, its velocity and acceleration vectors are always perpendicular to each other at every point in the path.

• True

• False

Uniform circular motion: Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represents the direction of the acceleration of the object at point P?

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• 
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What is the SI unit of Acceleration?

• m/s

• m

• ms^2

• m/s^2

What is the SI unit of Velocity?

• m

• m/s^2

• m/s

• s/m

What is the SI unit of displacement?

• m•s

• m

• s

• ms^2