2021 Actual Paper 1 Lol

Question 1

Remember W means watt as not WEIGHT

Answer 1

Don’t lack. Always calculate full answer, then leave to sf

Question 2

Remember how to find the direction for IMPULSE

Answer 2

This is CRUCIAL, will lose a mark here

• in your previous speeds see where final speed is acting, and what DIRECTION took to be positive
• if downwards is positive, and force acts on a ball as it hits floor thr force direction is UPWARDS, and impulse is thus UPWARDS

So impulse would be negative as defined down to be positive

Impulse direction ALWAYS = FORCE DIRECTION, don’t lack !

Question 3

CRUCIAL, ENERGY IN A RADIAL FIELD IS ALWYAS WHAT

Answer 3

When finishing grvatianl potential energy, MUST take the negative sign, keep it negaitve

And when adding kinetic, add it to the negative, don’t LACK,

ONLY MGH is positive as it’s a change from less to more negative , positive chnsge

JUST DONT LACK, potential and energy values always negarive

Question 4

Remember how to find velocity of something orbiting

Answer 4

Use centripetal force and equate to grav force, remember when cancelling the big M is the thing that something is orbiting around

Otherwise as it does circular motion, equate v to omega r and go from there

Kinetic energy of something orbiting will be quite high, domt lack

Question 5

Why is centripetal force around the earth less?

Answer 5

This because the radius to centre of rotation decreases!

Question 6

Explain why it must be on top of equator

Answer 6

So that it’s in-line with the rotation direction of the earth , and does not gain any latitude etc

Question 7

No matter what, if vertical distance the same, then why will horizontal disgamce not affect

Answer 7

Don’t lack, it won’t because the vertical distance and initsl velocity is the same , so the time taken to fall will be the same, and horinxtal velocity is constant