PHYSICS - Momentum and equations of motion

Question 1

Pfhlægië

Question 2

What is the equation for momentum and what is the unit?

Answer 2

Momentum = mass (kg) x Velocity (m/s)

The unit is kgm/s (who coulda guessed)

Question 3

What Newton’s second law but with momentum, I forgot

Answer 3

Force = change in momentum / time

F = Δp/t (yeah idk why it’s p either)

Question 4

What is the conservation of momentum?

Answer 4

Momentum is always conserved during a collision as long as there’s no other forces acting.

Some moment may be transferred but the total remains the same.

Question 5

Suppose two identical cars collided.

Car 1 exerts 16000N of force on Car 2, how much force does Car 2 exert on Car 1?

Answer 5

16000N aswell

Question 6

Is velocity a vector or scalar?

Answer 6

Vector

Question 7

whats the formular for kinetic energy? (you probably don’t need to remember this)

Answer 7

KE = ½MV^2

Question 8

What is the initial velocity of an object at rest?

Answer 8

0m/s

Question 9

What is the final velocity of an object coming to rest?

Answer 9

0m/s

Question 10

What is the acceleration of an object falling through the air (how could newton do this 😔)

Answer 10

10 m/s^2

Question 11

What the formula for moment (torque)? (with units)

Answer 11

Moment (Nm) = Force (N) x perpendicular distance from pivot (m)

Question 12

Suppose you want to increase the moment (torque) of a hammer lifting a nail. How?

Answer 12

• Increase force
• Increase distance from pivot

Question 13

What does equilibrium mean?

Answer 13

Balanced

Question 14

What’s the principal of moments?

Answer 14

When in rotational equilibrium (stuff ain’t moving), the sum of clockwise moments must equal the sum of the anticlockwise moments.

Question 15

Name each and every equation of motion

Answer 15

you’re given them in the exam, bozo

just know how/when to use them