State Newton's First Law of Motion in words - NSC Technical Sciences - Question 2 - 2020 - Paper 1

To determine the frictional force (k ext{f}) acting on the sled, we can analyze the forces in play. Given that the sled moves at a constant velocity, the net force must be zero.

We can resolve the applied force into its components:

• The horizontal component is given by: $F_{horizontal} = F imes ext{cos}(40^ ext{°})$
• From the marking scheme, we can find that: $F_{horizontal} ext{ at } 80 ext{ N} = 80 imes 0.766 = 61.28 ext{ N}$
• The frictional force must balance this out to ensure constant velocity, k_{f} = 61.28 ext{ N} ext{ (to the left)}.

Inertia is defined as the property or tendency of an object to resist any change in its state of rest or motion unless acted upon by an external force. It indicates how much an object resists changes in its velocity.

INCREASE