5-10 Preparation for the test

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 3

Summary of chapter 5 for the test

What you need to know from 5.1

• From the velocity-time graph:

        - Draw it

        - use it to calculate distance en acceleration

• (a,t)- and (s,t)-diagram... explain and use it


• Formula of acceleration (Also if acceleration is not uniform)

        - Use it to calculate acceleration

        - Use it to calculate velocity

Convert from

km/h to m/s

In which of the two cases is the distance covered the greatest? Give a reason for your answer.

In which of the two cases is the distance covered the greatest? Give a reason for your answer.

1. Left
2. Right

Brain accelerates uniformly from rest untill he reaches a velocity of 60 km/h. After maintaining this velocity for a while he floors the gaspedal. At a velocity of 120 km/h he needs to make an emergency stop. Draw a velocity time graph for the motion.

Answer to the previous question

Emergency stop

Determine the distance covered in the following diagrams.

Answer to the previous question

What must you know from 5.2

• Calculate the resultant force
• Explain the effects a resultant force has on an object i.t.o

        - acceleration

        - velocity

        - position

• Use Newtons 3rd law

Especially be able to calculate the reslutant force with F = ma

What must you know of 5.3

• What is inertia and how does it influence motion.
• The second law of motion of Newton ... F = ma

        - Make calculations with the formula

        - Use the concept of resultant force

        - If you have calculated F then calculate acceleration

        - Explain how a change in Fres changes the acceleration

Calculate the acceleration

50 N

35 N

670 kg

friction = 45 N

Answer to the previous question

A resultant force of 26N works on an object. Due to this the object accelerates at 0,24 m/s². Calculate the mass of this object.

Answer to the previous question

Given:

Asked:

Solution:

and from 5.4 you must know

• What is uniform acceleration and deceleration
• Know when to use a negative for acceleration
• Stopping distance = reaction distance + braking distance

A cyclist cycles at 15 m/s when he brakes with an acceleration of -4 m/s². Calculate how long it takes untill his velocity has decreased by 3 m/s.

Answer to the previous question

Given:

Asked:

Solution:

Calculate the acceleration:

Good luck with studying, and if you still have questions let me know.