2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 Motion Velocity Friction Acceleration Force.

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Presentation transcript:

Motion Velocity Friction Acceleration Force

______ is the rate of change in position Motion 1

Speed is the rate of change In position Motion 1

________ speed is the total distance divided by The total time Motion 2

Average speed is the total distance divided by the total time Motion 2

What is an objects change in position relative to a reference point? _________ Motion 3

What is an objects change in position relative to a reference point? motion Motion 3

Speed that does not vary is called ________ speed Motion 4

Speed that does not vary is called Constant speed Motion 4

The picture indicates what kind of speed? Motion 5

Instantaneous speed Motion 5

True or False Two bicycle riders have the same speed. Their velocity must also be the same. Velocity 1

False Their directions may be different. Velocity 1

Velocity 2 People on Merry-go-rounds change velocity because the _______ changes

Velocity 2 People on Merry-go-rounds change velocity because the direction changes

Velocity 3 DAILY DOUBLE 1. What is the equation for calculating velocity? 2. What does each variable stand for?

Velocity 3 DAILY DOUBLE 1. v = d/t 2. v = velocity (speed) d = distance t = time

Amy swam 50 m downstream in 25 seconds. What was her average velocity? Velocity 4

Amy swam 50 m downstream in 25 seconds. What was her average velocity? V = d/t = 50 m/ 25 s = 2 m/s

If Andy drives his dune buggy at an average velocity of 350 m/s how long would it take him to go 5 km? Velocity 5

If Andy drives his dune buggy at an average velocity of 120 km/h how long would it take him to go 5 km? V=d/t so t = d/v Convert km to m 5 km = 5000 m t = 5 km  120 km/h =0.042h = 60 min * = 2.5 min

Acceleration is the rate at which _____ changes. Acceleration 1

Acceleration is the rate at which velocity changes.

The units of acceleration are __________ Acceleration 2

The units of acceleration are m/s 2 Acceleration 2

Acceleration caused by uniform circular motion is called ___________ acceleration. Acceleration 3

Acceleration caused by uniform circular motion is called centripetal acceleration.

Acceleration 4 A sports car can accelerate from 0 to 60 in 6 seconds. If 60 mi/h is equal to 27 m/s, what is the sports car’s average acceleration?

Acceleration 4 A sports car can accelerate from 0 to 60 in seconds. If 60 mi/h is equal to 27 m/s, what is the sports car’s average acceleration? a = v f – v i t 27 – 0 m/s 6 s = 4/5 m/s 2

Acceleration 5 If a bicycle has an average acceleration of m/s 2 with and initial forward velocity of 8.2 m/s, how long will it take to come to a stop?

Acceleration 5 If a bicycle has an average acceleration of m/s 2 with and initial forward velocity of 8.2 m/s, how long will it take to come to a stop? t = v f – v i a t = 0 – 8.2 m/s m/s 2 = s

A _______ is a push or a pull Force 1

A Force is a push or a pull Force 1

Forces that are equal in size, but opposite in direction are called _______ forces Force 2

Forces that are equal in size, but opposite in direction are called balanced forces Force 2

The _____ force is the sum of all the forces acting on an object. Force 3

The net force is the sum of all the forces acting on an object. Force 3

Force 4 If the net force is unbalanced, the object will _________ in the direction of the net force.

Force 4 If the net force is unbalanced, the object will accelerate in the direction of the net force.

Force 5 Calculate the resultant force for the following.

Force 5 Calculate the resultant force for the following.

______ _______is a force that opposes motion between two moving objects that are touching. Friction 1

Kinetic friction is a force that opposes motion between two moving objects that are touching. Friction 1

Friction 2 Which type of friction exerts the smallest opposing force on a moving body?

Friction 2 Which type of friction exerts the smallest opposing force on a moving body? Rolling friction

Friction 3 Frictional forces always act in what direction?

Friction 3 Frictional forces always act in what direction? Opposite the direction of motion

Friction 4 A sky diver uses a parachute to float to earth slowly and safely. This is an example of what type of kinetic friction?

Friction 4 A sky diver uses a parachute to float to earth slowly and safely. This is an example of what type of kinetic friction? Fluid friction or air resistance

Friction 5 If the box is NOT moving down the ramp, what is the force of static friction exerted on the box?

Friction 5 If the box is NOT moving down the ramp, what is the force of static friction exerted on the box?