Chapter 7 - Laws of Motion and Momentum

Question 1

How do you resolve momentum?

Answer 1

In the x direction = total initial momentum = total final momentum.

In the y direction = total initial momentum = total final momentum.

Question 2

State Newton’s First Law of Motion.

Answer 2

Newton’s First Law of Motion: An Object will remain at rest or continue to move with constant velocity unless acted upon by a resultant force.

Question 3

State Newton’s Third Law of Motion.

Answer 3

Newton’s Third Law of Motion: When two objects interact, they exert equal and opposite forces on each other.

Question 4

Define linear momentum.

Answer 4

Linear Momentum is defined as:

p = mv
Momentum = mass x velocity
kgms⁻¹ = kg x ms⁻¹

Question 5

What are the similarities and differences between perfectly elastic and inelastic collisions.

Answer 5

In perfectly elastic collisions:

• Momentum is conserved.
• Total Energy is conserved.
• Total Kinetic Energy is conserved.

In inelastic collisions:

• Momentum is conserved.
• Total Energy is conserved.
• Total Kinetic Energy is not conserved.

Question 6

State Newton’s Second Law and its equation.

Answer 6

Question 7

Define an inpulse.

Answer 7

Question 8

What is the area under a force time graph?

Answer 8