Consider a heavy truck which breaks down out on the road and receives a push bac

Question

Consider a heavy truck which breaks down out on the road and receives a push back to town by a small compact car (M>m). For each description of a collision, choose the answer that best describes the size (or magnitude) of the forces between the car and the truck.
Q1.The car is pushing on the truck, but not hard enough to make the truck move.
1. The force of the car pushing against the truck is less than that of the truck pushing back against the car.
2. The car's engine is running so it applies a force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.
3. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.
4. None of the descriptions is correct.
5. The force of the car pushing against the truck is greater than that of the truck pushing back against the car.
6. Neither the car nor the truck exerts any force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.

Q2.The car, still pushing the truck, is speeding up to get to cruising speed.
1. The force of the car pushing against the truck is greater than that of the truck pushing back against the car.
2. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.
3. Neither the car nor the truck exerts any force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.
4. None are correct.
5. The force of the car pushing against the truck is less than that of the truck pushing back against the car.
6. The car's engine is running so it applies a force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.

Q3.The car, still pushing the truck, is at cruising speed when the truck puts on its brakes and causes the car to slow down.
1. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.
2. The force of the car pushing against the truck is less than that of the truck pushing back against the car.
3. None of these descriptions is correct.
4. Neither the car nor the truck exerts any force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.
5. The car's engine is running so it applies a force as it pushes against the truck, bu the truck's engine is not running so it can't push back with a force against the car.
6. The force of the car pushing against the truck is greater than that of the truck pushing back against the car.

Q4.The car, still pushing the truck, is at cruising speed and continues to travel at the same speed.
1. The force of the car pushing against the truck is less than that of the truck pushing back against the car.
2. The force of the car pushing against the truck is greater than that of the truck pushing back against the car.
3. The car's engine is running so it applies a force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.
4. None are correct.
5. Neither the car nor the truck exerts any force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.
6. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.

Explanation / Answer

1) 3. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.

2)2. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.

6.The car's engine is running so it applies a force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.

3)1. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.

4)3.The car's engine is running so it applies a force as it pushes against the truck, but the truck's engine isn't running so it can't push back with a force against the car.

6. The force of the car pushing against the truck is equal to that of the truck pushing back against the car.

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