Intro to Physics Unit 1 Test Ch 1-4 & 7

Newton's First Law of Motion

"A body continues in its state of rest or uniform motion in a straight line unless acted upon by a force" This is a statement of__

A ball is initially rolling up a slight incline at .2m/s. It decelerates at .05m/s2. What is the balls DISPLACEMENT after 6s?

.3m

A car is going up slope and decelerating at .1m/s2. It comes to a complete stop after going for 5s. What was its initial velocity?

.5m/s

A sparrow cruising at 1.5m/s begins to accelerate at a constant .3m/s2 for 3s. What was the CHANGE in velocity?

.9m/s

A dropped ball falls from a height of 10m to the ground. Its acceleration is 9.8m/s2 downward. How long does it take to fall and hit the ground?

1.43s

A car is going backwards at 5m/s. After 10s of uniform acceleration, the car is going forwards at 10m/s What is the acceleration?

1.5m/s2

The density of water at room temperature is about

1000kg/m^3

The prefix "pico" stands for ___

10^-12

The prefix "nano" stands for

10^-9

The prefix "giga" stand for

10^9

A car going 20m/s in traffic. When traffic breaks the driver steps on the accelerator , accelerating at a constant 1.2m/s2 for 5s. How far does the car travel in 5s?

115m

A dropped ball falls from a height of 10m to the ground. Its acceleration is 9.8m/s2 downward. What is its velocity just before hitting the ground?

14m/s

A car accelerates uniformly from 5m/s to 30m/s in 10s. What is the car's average velocity during this time interval?

17.5m/s

A car accelerates uniformly from 5m/s to 30m/s in 10s. How far does the car travel during this time?

175m

A squirrel is running on a wire with constant acceleration. If its initial velocity is .4m/s and final velocity is.8m/s after 4s how far did the squirrel travel?

2.4m

A car accelerates uniformly from 5m/s to 30m/s in 10s. What is the car's acceleration?

2.5m/s^2

A car is going backwards at 5m/s. After 10s of uniform acceleration, the car is going forwards at 10m/s What is the net distance traveled?

25m

A car is traveling 25m/s when it passes the 3000 km marker. The car accelerates at .02m/s2 for 500s. What kilometer marker will it pass at the 500s time?(Warning --watch meters vs kilometers)

3015km

A ball is initially rolling up a slight incline at .2m/s. It decelerates at .05m/s2. At what time does the ball come to a stop?

4s

A plane is flying east at 75m/s and there is a wind blowing south at 10m/s. What is the resulatant velocity of the plane?

75.66m/s

The acceleration due to gravity or "g" is

9.8m/s^2

A scaler quantity has both magnitude and direction

False

Mass is what manifests itself as the _____ of the body at rest.

Inertia

If an object moves through equal distance in equal times then it is moving at constant___

Speed

In order to get instantaneous velocity you must draw a(an) _____to the v-t curve at t.

Tangent

Science

That which explores the world by experiments and observations is called

Acceleration = ___________/time

Velocity

The rate of change of displacement is called

Velocity

A woman is going to a friends house to discuss opening a business. At 11am she starts from rest and accelerates at a constant 2.5m/s2 for 9s to get to cruising speed. She drives for 15 minutes at this constant speed before she enters city traffic. She stops at her friends house which is straight lined from hers 27km. She arrives at 12:15. Time interval is 11 to 12:15. What is her initial velocity? What is her final velocity ? What is her average velocity? What is her velocity 9s into the trip?

initial velocity- 0m/s final velocity- 0m/s average velocity- 6m/s velocity 9s in- 22.5m/s

Density is defined as

mass/volume

Acceleration can be negative?

true