IB DP Physics: Mechanics

Question 1

A ball rolls horizontally whilst slowing down. What is the minimum number of forces acting on the ball?

Accepted Answer

3

Question 2

Why do astronauts on the International Space Station (ISS) appear weightless?

Accepted Answer

The normal reaction force acting on them is zero.

Question 3

Forces A and B are applied that moves a block to the right at constant speed. Which forces are doing work on the block?

Accepted Answer

A only

Question 4

If an aircraft flies 900 km between two airports that are both at sea level, which statement is correct?

Accepted Answer

The total work done by gravity on the aircraft is zero.

Question 5

During a tug of war, both sides pull on a rope with a force of 100 N. What is the magnitude of the tension in the rope?

Accepted Answer

100 N

Question 6

A heavy box is hung from a rope. At which point is the tension greatest? ​(hint – the rope is not 'light')

Accepted Answer

A

Question 7

Two objects move as shown. They collide and stick together. What fraction of the kinetic energy is lost?

Accepted Answer

\frac{1}{9}

Question 8

Have you ever ‘felt lighter’ when an elevator is moving? Which of these could be the reason?

Accepted Answer

The elevator is moving up and decelerating.

Question 9

A 50,000 tonne cruise ship is sailing at a constant velocity. What is the magnitude of the net force acting on the ship?

Accepted Answer

0

Questions 9