Linear Motion

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

Consider drops of water leaking from a water faucet. As the drops fall they

get further apart

When you look at a speedometer in a moving car, you can see the car's

instantaneous speed

When a basketball player jumps to make a shot, once his feet are off the floor, the jumpers acceleration

is g; no more, no less

If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?

neither they will both reach the bottom at the same time

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the seed of the ball when caught would be

the same speed it had when thrown upwards

True or False: Even though a car is slowing down, it is still accelerating (in the most general form of acceleration)

true

True or False: The rate at which a distance is covered is called speed

true

True or False: Velocity is different from speed because it is in a given direction

true

True or False: motion is described relative to something else

true

True or False: the rate at which velocity changes with time is called acceleration

true

a pencil lies on your desk. if the earth is moving around the sun at a speed of 30km/s, how fast is the pencil moving relative to... the desk?...the sun?

0km/s; 30km/s

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, and 6 meters again during the third second. It's acceleration is?

0m/s squared

Suppose a jumper claims a hang time of two seconds. Then that jumper must jump a vertical distance of

5m

a car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration?

6m/s squared

If a ball were equipped with a speedometer and allowed to fall freely on a planet where the acceleration due to gravity is 23m/s squared, the reading on the speedometer would increase each second by

23m/s

suppose a car is moving in a straight line and steadily increases it's speed. It moves from 35km/h to 40km/h the first second and from 40km/h to 45km/h the next second. What is the car's acceleration

5km/h

A car accelerates at 2m/s squared. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 20m/s squared.

10 seconds

If a projectile is fired straight up at a speed of 30m/s, the total time to return to its starting point is

6 seconds

suppose you take a trip that covers 180km and takes 3 hours to make. Your average speed is

60km/h

A freely falling object starts from rest. After falling 6 seconds, it will have a speed of about

60m/s

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

The coin

Acceleration

The rate at which velocity itself changes

suppose you are in a car that is going around a curve. The speedometer reads a constant 30mph. Which of the following is NOT true?

Your velocity is constant

suppose an object is in free fall. Each second the object falls

a larger distance than in the second before

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

about 10m/s

A ball is thrown straight up. At the top of it's path the acceleration is

about 10m/s squared

When something falls to the ground it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?

about 10m/s squared

In the absence of air resistance, objects fall at a constant

acceleration

A ball tossed vertically upward rises, reaches it's highest point, and then falls back to it's starting point. During this time the acceleration of the ball is always

directed downward

True or False: A unit of velocity is the meter

false

True or False: Average speed is defined as the time it takes for a trip divided by the distance

false

True or False: a ball is thrown into the air at the highest point it has zero velocity and zero acceleration

false

True or False: as a ball falls freely the distance it falls each second is the same

false

True or False: when a car rounds a corner at constant speed, its acceleration is zero

false

True or False: when we discuss the speed of things we mean with respect to the center of the universe

false

True or False: a unit of acceleration is m/s

false: m/s squared

Acceleration is defined as the change in

velocity divided by the time interval

As an object freely falls in a vacuum, its...

velocity increases


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