1 Define momentum. 1.2 Distinguish between angular velocity and angular acceleration. 1.3 State Hooke's law. 1.4 Distinguish between elasticity and limit of proportionality.

Here are the solutions to Question 1:

1.1 Define momentum. Momentum is a measure of the mass in motion, defined as the product of an object's mass and its velocity. $p = mv$

1.2 Distinguish between angular velocity and angular acceleration.

• Angular velocity ($\omega$) is the rate at which an object rotates or revolves, representing the change in angular displacement over time. Its unit is radians per second ($\text{rad/s}$).
• Angular acceleration ($\alpha$) is the rate at which an object's angular velocity changes over time. Its unit is radians per second squared ($\text{rad/s}^2$).

1.3 State Hooke's law. Hooke's law states that the force ($F$) required to extend or compress a spring by some distance ($x$) is directly proportional to that distance, provided the elastic limit is not exceeded. $F = kx$ where $k$ is the spring constant.

1.4 Distinguish between elasticity and limit of proportionality.

• Elasticity is the property of a material that allows it to return to its original shape and size after the deforming force has been removed.
• Limit of proportionality is the point on a stress-strain curve up to which stress is directly proportional to strain. Beyond this point, Hooke's law is no longer valid, even if the material can still return to its original shape (within the elastic limit).