Chapter 2 Pretest. 1. After a body has fallen freely from rest for 8.0 s, its velocity is approximately: A) 40 m/s downward, B) 80 m/s downward, C) 120.

Slides:

Advertisements

Similar presentations

Freefall Motion Notes Any object near the surface of the Earth experiences the pull of gravity. If released from rest, the object will fall freely toward.

Advertisements

Motion in one dimension  motion is “relative”, or depends on your frame of reference  rate is a quantity divided by time.

Gravity And Free Fall. When gravity is the only force acting on an object,it is said to be in free fall. 1.

Turn in your homework in the front. Begin: Journal 9/03 1. Write the equation for distance using time and velocity. 2. Write the equation for velocity.

The One-Dimensional Motion Game

The two measurements necessary for calculating average speed are

Does the odometer of a car measure distance traveled or displacement? 1.Distance traveled 2.displacement 3.neither 4.both.

Free Fall Examples. Example 2-14 Falling from a tower (v 0 = 0) Note! Take y as positive DOWNWARD! v = at y = (½)at 2 a = g = 9.8 m/s 2.

General Physics 1, additional questions, By/ T.A. Eleyan

Lots of fun! Win valuable prizes!

Sect. 2-7: Falling Objects

Free falling …. ACCELERATION DUE TO GRAVITY All bodies in free fall (that is no air resistance) near the Earth's surface have the same downward acceleration.

Chapter-3 Kinematics in Two Dimensions

Motion in Two Dimensions

Chapter 2, Part 3 September 7, A ball is thrown downward (not dropped) from the top of a tower. After being released, its downward acceleration.

Chapter 2 Linear Motion Speed Velocity Acceleration Free Fall.

Chapter 3 Pretest. 1. After a body has fallen freely from rest for 8.0 s, its velocity is approximately: A) 40 m/s downward, B) 80 m/s downward, C) 120.

Review.  What is it called when the speed of an objects changes?

Motion in one dimension

1.) An object projected straight upward with an initial velocity of 88.2m/s will reach its maximum altitude of 396.9m in 9s. If after 5s the object is.

Linear Motion Review. 1.Speed is a ____ quantity. A.) vector B.) scalar C.) additive D.) subtractive.

Chapter 3 Review Acceleration and Free Fall 1.When an object undergoes a change in velocity, it is said to be ______________. ans: accelerating/decelerating.

Free Fall & Projectiles Chapter 3, sections 7-9 & Chapter 8, sections 1-4.

Accelerated Motion Problems

Projectile Motion Previously, we studied motion in one direction (linear motion) Projectiles follow a curved path (nonlinear motion) The velocity of a.

Linear Motion Review.

Why is speed scalar and velocity vector. Speed is only a number

Freely Falling Objects. Important & common special case of uniformly accelerated motion: “FREE FALL” Objects falling in Earth’s gravity. Neglect air resistance.

Graphical Look at Motion: displacement – time curve The slope of the curve is the velocity The curved line indicates the velocity is changing Therefore,

PHY115 – Sault College – Bazlurslide 1 Linear Motion.

Kinematics in One Dimension Chapter 2 Kinematics deals with the concepts that are needed to describe motion. Dynamics deals with the effect that forces.

Mathematical Model of Motion Chapter 5. Velocity Equations Average velocity: v =  d/  t To find the distance traveled with constant or average velocity.

Chapter 3 Kinematics in Two Dimensions. 3.1 – d, v, & a A bullet is fired horizontally. A second bullet is dropped at the same time and at from the same.

Conceptual Physics Notes on Chapter 2 Motion in One Direction.

Chapter 2 MOTION IN ONE DIMENSION. Particle: A point-like object – that is, an object with mass but having infinitesimal size.

4.5 Free Fall. Falling Objects Imagine there is no air resistance and that gravity is the only thing affecting a falling object. An object moving under.

Displacement, Velocity, Constant Acceleration.

Chapter 2 Motion in One Dimension. Motion is relative.

Chapter Review. 1. A car is driven 1500 meters west in 120 seconds. What is the velocity in m/s?

Kinematics – Linear Motion Topics Point of Reference Speed – Velocity - Acceleration Free Fall – How Far?, How Fast? Graph of Motion Activities Class.

Unit 1 MOTION. MOTION LINEAR MOTION Rate: a quantity divided by time Motion is relative Speed: rate at which distance is covered; how fast something is.

If your pen falls off your desk does it accelerate? If I drop a pen, what is its initial speed? How fast is it going just before it hits the ground? ZERO.

A bicycle travels 15 km in 30 minutes. What is its average speed?

1. The speed of sound in air is 330m/s. In one hour sound could travel a distance of: A. 620 mi B. 743 mi C. 810 mi D mi.

Projectile Motion Chapter 5.4 – 5.6 Notes. Projectile Motion A projectile is any object that moves through the air or space, acted on only by gravity.

2.7 Freely Falling Bodies In the absence of air resistance, all bodies at the same location above the earth fall vertically with the same acceleration.

Chapter 2 Extra Review.

Kinematics in One Dimension

Projectile Review.

Describing Motion Free falling ….

Describing Motion: Kinematics in One Dimension

v = v0 + a ∆t ∆x = v0∆t + 1/2 a∆t2 v2 = v02 + 2a∆x

The vertical one-dimensional motion

3 Linear Motion Speed Velocity Acceleration Free Fall Dr. Jie Zou

Kinematics in One Dimension

Chapter-3 Kinematics in Two Dimensions

Chapter 3 Jeopardy Review

Free Fall Free fall: when an object is only affected by gravity

Acceleration and Free Fall Notes

Free Fall: How Fast and How Far

Chapter-3 Kinematics in Two Dimensions

stays there for a second, and then runs back to P

Uniform Acceleration Review

Chapter 2 Motion in One Dimension

2.7 Freely Falling Bodies In the absence of air resistance, all bodies at the same location above the earth fall vertically with the same acceleration.

In the previous chapter we studied simple straight-line motion—linear motion.

Motion- Chapter 1 pp

Presentation transcript:

Chapter 2 Pretest

1. After a body has fallen freely from rest for 8.0 s, its velocity is approximately: A) 40 m/s downward, B) 80 m/s downward, C) 120 m/s downward, D) 160 m/s downward.

2. The body in item 1 fell approximately: A) 40 m, B) 80 m, C) 160 m, D) 320 m.

3. An object is accelerated from rest at the rate of 3.0 m/s 2. After it has traveled13.5 m, its velocity is: A) 3.0 m/s, B) 6.0 m/s, C) 9.0 m/s, D) 12.0 m/s.

4. Acceleration is best defined as the CHANGE in: A) velocity of an object. B) distance divided by time interval. C) time it takes to move from one speed to another speed. D) time it takes to move from one place to another place. E) velocity divided by the time interval.

5. In the absence of air resistance, objects fall at constant: A) speed. B) distances each successive second. C) velocity. D) acceleration. E) all of the above

6. Suppose you take a trip that covers 240 km and takes 4 hours to make. Your average speed is: A) 60 km/h. B) 120 km/h. C) 240 km/h. D) 960 km/h. E) 480 km/h.

7. A ball is thrown straight up. At the top of its path its instantaneous speed is: A) about 50 m/s. B) 0 m/s. C) about 5 m/s. D) about 10 m/s. E) about 20 m/s.

1. The engine of an automobile can accelerate it at 6.00 m/s 2. A) How many seconds are needed to accelerate the automobile to a speed of 54.0 m/s? B) How many meters does the automobile travel during this acceleration?

(A) v = v 0 + at 54 = 0 + 6t t = 9 s

(B) x = v 0 t + ½ at 2 x = 0(9) + ½ 6(9) 2 x = 243 m

(B) OR v 2 = v ax 54 2 = (6)x x = 243 m/s

2. You toss a ball upward at 40.0 m/s. How much time will the ball take to reach the top of its path?

v = v 0 + gt 0 = 40 + (-10)(t) t = 4 s

3. A crate falls from an airplane flying horizontally at an altitude of 3,000 m. How long will it take the crate to reach the ground?

y = v 0 t + ½ gt = 0( t) + ½ (10)t 2 t = 24.5 s

4. A lemming runs off the edge of a cliff. After it has fallen 30 m, what is the lemming’s velocity?

v 2 = v gy v 2 = (10)30 v 2 = 600 v = 24.5 m/s

5. A stone is dropped from a cliff. After it has fallen 40 m, what is the stone’s velocity?

v 2 = v gy v 2 = (10)40 v 2 = 800 v = 28.3 m/s