Question

A hydraulic jack is used to lift a car in order to change a tire. The car exerts a force of 9,800 N toward the ground due to the force of gravity.

To begin to lift the car, a hydraulic jack must produce
of force.

To keep the car in position once it is lifted, the jack must produce
of force.

Answer 1

To lift the car, the hydraulic jack must produce a force equal to or greater than the weight of the car, which is the force due to gravity acting on it.

1. **To begin to lift the car**, the hydraulic jack must produce a force of **9,800 N**. This is necessary to overcome the weight of the car in order to initiate lifting.

2. **To keep the car in position once it is lifted**, the jack must also produce a force of **9,800 N**. This is required to counteract the weight of the car and maintain the lift.

Thus, in both cases, the force that the hydraulic jack must produce is **9,800 N**.