| A | B |
|---|
| Why does a child in a wagon seem to fall backward when you give the wagon a sharp pull? | ??? |
| If the acceleration of a body is zero, are no forces acting on it? | ??? |
| Why might your foot hurt if you kick a heavy desk or a wall? | ??? |
| What force is needed to accelerate a child on a sled (total mass = 60.0 kg) at 1.15 m/s^2? | ??? |
| A net force of 255 N accelerates a bike and rider at 2.20 m/s^2. What is the mass of the bike and rider? | ??? |
| How much force is required to accelerate a 9.0-g object at 10,000 g's? | ??? |
| How much tension must a rope withstand if it is used to accelerate a 1050-kg car horizontally at 1.20 m/s^2? Ignore friction. | ??? |
| What average force is required to stop an 1100-kg car in 8.0 s if it is traveling at 90 km/h? | ??? |
| According to a simplified model of a mammalian heart, at each pulse, approximately 20 g of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle? | ??? |
