Paper 2 Cards Flashcards
What unit is the joule equivalent to?
Nm
What is a contact force?
A force which can only act when two objects are physically touching.
A car is travelling at 30 mph. Which of the following is a sensible estimate for the stopping distance of the car?
25m
An electromagnetic wave slows down as it enters a different medium at an angle to the normal. What happens to the wave’s direction?
It bends towards the normal
X-rays are suitable to be used in medical imaging because…
they are not transmitted by bones, but are transmitted by softer tissue.
Which of these is a typical running speed for a person?
3m/s
An iron core can be placed in the middle of a current-carrying solenoid to…
increase the strength of the magnetic field of the solenoid.
Which of these is an example of a longitudinal wave?
Sound waves
A teapot, weighing 10 N, is sat stationary on a table. What is the normal contact force applied to the teapot by the table?
-10 N
The force between the north poles of two bar magnets is…
Repulsive
Which of the following electromagnetic waves has the lowest frequency?
Infrared
Visible light
Ultraviolet
Infrared
If the resultant force on a moving object is zero, the object will…
keep moving at a steady speed.
What is the typical speed of sound in air?
330m/s
Which quantity is not a vector?
Speed
Force
Displacement
Speed
Waves can change direction as they cross a boundary between two different substances. What is this called?
Refraction
