5.3, Acceleration - uniform motion - deceleration

• Natuurkunde
• Middelbare school
• vmbo k, g, t
• Leerjaar 2

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5.3 Acceleration - uniform motion - deceleration

Learning objectives

1. You can explain what happens to speed in uniform, accelerating and decelerating motions.

2. You can calculate the speed at any moment of the motion in a uniform motion

3. You can read off the (x,t)-diagram and the (vat)-diagram for a uniform, accelerating and decelerating motions.

Physicists divide movements into different types. They mainly look at the speed:

-the speed is increasing,

-she stays the same all the time or

-does it continue to decline?

Accelerating motion

The accelerated movement is a movement of which the speed is increasing.

Example: a car that starts driving after coming to a stop at a traffic light

Uniform motion

The uniform movement is a movement in which the speed always remains the same.

Example: a car that constantly drives 100 km / h on the highway (on cruise control)

The uniform movement is also called the constant movement

Decelerating motoin

The slowed down movement is a movement in which the speed continues to decrease.

Example: a car braking in front of a red traffic light

Op de volgende slide staat een flimpje die uitlegt hoe de grafiek van een versnelde, evenredige en vertraagde beweging eruit ziet. 

Kijk alleen de eerste helft van het filmpje (tot ongeveer 3:50), het tweede deel is voor HAVO VWO

A car drives away at a traffic light.
What kind of movement is this?

1. uniform motion
2. accelerating motion
3. decelerating motion

You have to slow down on the bike, because the barriers close.
What kind of movement is this?

1. uniform motion
2. accelerating motion
3. decelerating motion

A marathon runner runs at a constant speed.
What kind of movement is this?

1. uniform motion
2. accelerating motion
3. decelerating motion

What do you call a movement whose speed keeps increasing?
a ... movement?

What do you call a movement whose speed does not change?
a ... movement

What do you call a movement whose speed is getting smaller and smaller?
a ... movement?

A parachutist jumps out of an airplane and opens his parachute after five seconds.
a / What kind of movement does he make in the first five seconds?
a ... movement

b / What kind of movement does it make when the parachute is open?
a ... movement

Just before landing, the parachutist changes speed.
c / What kind of movement does he make?
a ... movement

You can estimate some speeds much better than others.
a / Give an example of a speed that you can estimate correctly.

b / Give an example of a speed that is very difficult to estimate.

c / Explain why it is so difficult to estimate that second speed.