1. Measuring tape used because it is considered flexible so that it can wrap itself around
the ball and tell the student the circumference of the football.
2. When two forces are applied on a object in the same direction, forces added up and
net force increases. Two forces that act in opposite directions produce a resultant force
that is smaller than either individual force. To find the resultant force, subtract the
magnitude of the smaller force from the magnitude of the larger force. The direction of the
resultant force is in the same direction as the larger force.
3. Equilibrium, in physics, the condition of a system when neither its state of motion nor its
internal energy state tends to change with time. Equilibrium is also defined as a state
of balance or a stable situation where opposing forces cancel each other out and
where no changes are occurring. For a single particle, equilibrium arises if the vector
sum of all forces acting upon the particle is zero.
4. When a force is applied to the brakes of a vehicle, there is work done by the friction
between the brakes and the wheel. This reduces the kinetic energy of the vehicle, slowing
it down and causing the temperature of the brakes to increase. One of things that
affected stoping/braking distance of a car and increase it is vehicle’s greater speed.
So the answer is 3 only; by increasing the speed of the car.