The first five questions of this practice quiz are open to everybody, with no code and no sign-in. AP Physics 1 and 2, Unit 2, force and translational dynamics.
1. Two blocks lie on the \(x\)-axis: 2.0 kg at \(x=0\) and 6.0 kg at \(x=4.0\ \mathrm{m}\). The center of mass of the pair is at
- \(x=1.0\ \mathrm{m}\)
- \(x=2.0\ \mathrm{m}\)
- \(x=3.0\ \mathrm{m}\)
- \(x=4.0\ \mathrm{m}\)
2. Two skaters stand at rest on frictionless ice and push each other apart. While they are moving apart, the center of mass of the pair
- stays exactly where it was
- moves toward the heavier skater
- moves toward the lighter skater
- moves in the direction of the larger push
3. A book slides across a frictionless table at constant velocity. Its free-body diagram should carry
- the gravitational force and the normal force only
- the gravitational force, the normal force and a forward force of motion
- a forward force of motion only
- the gravitational force only
4. A truck collides with a small car. During the collision the magnitude of the force the truck exerts on the car, compared with the force the car exerts on the truck, is
- larger, because the truck is heavier
- larger, because the truck was moving faster
- the same
- smaller, because the car is easier to accelerate
5. An object moves in a straight line at constant speed. Which statement must be true?
- No forces are exerted on it
- The net force exerted on it is zero
- Exactly one force is exerted on it
- The forces on it are all vertical