Physics Final Study Guide

A ball is thrown straight up. At the top of its path its instantaneous speed is

0 m/s

A ball is thrown straight up. At the top of its path its acceleration is

0 m/s/s

the vertical height attained by a basketball player who achieves a hang time of a full one second is about

1.2 meters

suppose a car is moving in a straight line and steadily increases its speed. it moves from 30 km/h to 40 km/h the first second and from 40 km/h to 50 km/h the next second. what is the car's acceleration

10 km/h•s

The acceleration due to gravity on earth is approximately

10 m/s squared

The average velocity for an object is 40 m per second For six seconds. What is the total distance traveled by the object

24 m

if a projectile is fired straight up at a speed of 15 m/s, the total time to return to its starting is about

3 seconds

suppose you take a trip that covers 150 km and takes 5 hours to make. your average speed is

30 km/h

a freely falling object starts from rest. after falling for 3 seconds, it will have a speed of about

30 m/s

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

4.2 m/s/s

mr. Vining sees Mr. Hill under his balcony. Mr. Vining drops the water balloon but falls freely for three seconds before striking Mr. Hill on the head and gets him soaking wet. How far did the balloon travel before striking Mr. Hill

45 m

if a car is traveling at a constant speed of 60 km/h, how long does it take to travel 300 km

5 hours

suppose a jumper claims to hang at a time of two seconds. Then that jumper must be able to jump a vertical distance of

5 m

The hang time (time one's feet are off the ground in a jump) for most athletes is

less than 1 second

one possible unit of speed is

miles per hour light years per century kilometers per hour

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

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

a ball is thrown upwards and is caught when it comes back down. in the absence of air resistance, the speed of the ball the instant before it is caught would be

the same as the speed it had when thrown upwards

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

get farther apart

when you look at the speedometer of a moving car, you can see the car's

instantaneous speed

When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration

is g; no more, no less

which of the following is not an acceleration unit

km/s

mr. Vining is looking at a new garden apartment in downtown Scottsdale and is out on the bonuses and find out how far up he is. He takes out a water balloon (he now always carries a few thanks to Mr. Hill) And drops it over the railing. If it takes two seconds to how far is the ground beneath him

-20 m

A body feels really from Ross near the surface of the earth. The distance the object falls in four seconds is

-80 m

A car accelerates uniformly from 3 m/s to 11 m/s in four seconds. The magnitude of the acceleration is

2 m/s per second

a freely falling object starts from rest. after falling for 2 seconds, it will have a speed of about

20 m/s

a car accelerates at 1 m/s/s. assuming the car starts from rest, how much time does it need to accelerate to a speed of 20 m/s

20 seconds

A runner travels 30 m at a steady speed of 5 m/s. The time taken is

Six seconds

suppose you are in a car that is going around a curve. the speedometer reads a constant 30 miles per hour. 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

speed is

a measure of how fast something is moving always measured in terms of a unit of distance divided by a unit of time the distance covered per unit time

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

about 10 m/s/s

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 10 m/s/s

In the absence of air resistance, objects fall at constant

acceleration

The area under a velocity time graph represents

displacement

T/F A unit of acceleration is meters per second

false

T/F a ball is thrown into the air. at the highest point the ball has zero velocity and zero acceleration

false

on a position versus time graph, The slope of the line represents

the velocity

T/F Average speed is defined as the time it takes for a trip divided by the distance.

true

T/F even though a car is slowing down it is still accelerating in the most general diffusion of acceleration

true

Acceleration is defined as the CHANGE in

velocity divided by the time interval

As an object falls freely in a vacuum, its

velocity increases