1. Your new motorcycle weighs 2420 N.

The acceleration of gravity is 9.8 m/s . What is its mass?

Answer in units of kg.

2. Suppose a cart is being moved by a certain net force.

If the net force is increased by a factor of 5.7, by what factor does its acceleration change?

3. A 5200 kg helicopter accelerates upward at

3 m/s. The acceleration of gravity is 9.8 m/s. What lift force is exerted by the air on the propellers? Answer in units of N.

4. A firefighter of mass 39kg slides down a vertical pole with an acceleration of 6 m/s . 2

The acceleration of gravity is 10 m/s . What is the friction force that acts on him? Answer in units of N.

5. A 1693.7 kg car is traveling at 23.2 m/s when the driver takes his foot off the gas pedal. It takes 4.6 s for the car to slow down to 20 m/s.

How large is the net force slowing the car? Answer in units of N.

6. The horizontal surface on which the block of mass 3.3 kg slides is frictionless. The force of 54 N acts on the block in a horizontal direction and the force of 162 N acts on the block at an angle as shown below.

162 N 60 54 N 3.3 kg