PANIC FLASHCARDS PAPER 2
Is air resistance a contact or non-contact force? Explain your answer.
Contact, the air particles are hitting the object
Is power a vector or a scalar? Explain your answer.
scalar, only magnitude and no direction
If an object does return to its original shape after the forces have been removed, it is known as _______ deformation.
On the other hand, if an object does not return to its original shape after the forces have been removed, it is known as _________ deformation (or sometimes plastic deformation).
Elastic
Inelastic
What are the units for moments?
Newton metres (Nm)
Atmospheric pressure is _________ at a higher elevation.
Higher or lower?
Lower
There is greater atmospheric pressure at sea level than at higher elevation. Why is this? (2)
The air is less dense at sea level
There are more gas particles at sea level to collide with objects
The air is more dense at sea level
There are more gas particles at sea level to collide with objects
The air is more dense at sea level
A person is walking 1.5 m/s north.
Is this an example of velocity or speed?
Velocity
What does the gradient of a velocity/time graph tell us?
The acceleration or deceleration of the object
What is Newton’s first law?
A resultant force is required to change the motion of an object.
What is Newton’s second law?
A resultant force will cause an object to accelerate in the direction of the force.
An example of circular motion is the moon orbiting the earth.
Which of the following are true? (2)
The moon is moving with constant velocity
The moon is moving at a constant speed
The moon is accelerating
The moon is not accelerating
The moon is moving at a constant speed
The moon is accelerating
What is Newton’s third law?
When two objects interact, the forces they exert on each other are equal and opposite?
When pushing against a wall, the wall pushes back with an equal and opposite force.
What is this force called?
The normal contact force
A vehicle drives twice as fast.
What happens to the braking distance?
The braking distance increases by four times
What factor affects both the thinking distance and the braking distance?
Speed of the vehicle
The total momentum before a collision is ________ the total momentum after the collision.
Less than / equal to / greater than?
Equal to
Which safety features of a car aim to slow the rate at which momentum is lost? (2)
Crumple zones
Air bags
Safety glass
Turning indicators
Crumple zones
Air bags
Light travelling from a less dense material, into a more dense material, will bend ________ the normal.
towards
When a wave travels into a more dense medium, the wave speed decreases.
What happens to the frequency of the wave?
Stays the same
Which of the following is true of radio waves?
They have a short wavelength, and a high frequency
They have a short wavelength, and a low frequency
They have a long wavelength, and a high frequency
They have a long wavelength, and a low frequency
They have a long wavelength, and a low frequency
What types of electromagnetic waves can be used in communication?
Radio and microwaves
What are the three types of radio waves?
Long, short, very short waves
What type of electromagnetic waves have longer wavelengths?
Visible light / ultraviolet light
Visible light
What can ultraviolet be used for?
Give sun tans
Check for ‘invisible markings’ on passports
Destroy microorganisms in water sterilisation
