same
More force would be needed to stop a semi truck than a motorcycle. This is because a semi truck is heavier and has more momentum, requiring more force to slow down or stop.
In a car and ten-wheeler truck collision, occupants of the car are more likely to be injured due to the size and weight disparity between the vehicles. The occupants of the car are at a higher risk of injury due to the impact force generated by the larger and heavier truck.
When a small car collides with a large truck, the force of impact is usually greater due to the size and weight difference between the two vehicles. This can result in more severe damage to the smaller car and potentially lead to serious injuries or fatalities for the occupants of the small car.
Whichever is lighter will accelerate more quickly.
A truck, except possibly a small pickup truck, will have more mass (weight) than typical cars. This means that for a given velocity, it has more momentum (kinetic energy) that will have to be opposed or removed in order to reduce its speed. The braking systems will have to dissipate more energy to stop the vehicle, and even with larger brakes, they will have to be applied over more time and the truck will travel more distance before it stops. A large truck can also do much more damage if it hits another vehicle or obstruction.
A truck, except possibly a small pickup truck, will have more mass (weight) than typical cars. This means that for a given velocity, it has more momentum (kinetic energy) that will have to be opposed or removed in order to reduce its speed. The braking systems will have to dissipate more energy to stop the vehicle, and even with larger brakes, they will have to be applied over more time and the truck will travel more distance before it stops. A large truck can also do much more damage if it hits another vehicle or obstruction.
The large truck moving at 30 miles per hour will have more momentum because momentum is directly proportional to an object's mass and velocity. Since the large truck has more mass than the small truck, it will have more momentum at the same speed.
Actually, the truck DOES decelerate, but its mass is so very much larger than the mass of the leaf, that the amount of deceleration is infinitesmal and too small to measure. Theoretically, at least, it is there.
In a collision both objects experience the exact same forces. The difference is the force threshold of each object. A hummer has a greater force threshold than a small car. The same idea is present when a bug hits a windshield. The bug hits the car with the same amount of force as the car hits the bug, but the bug has a much lower force threshold which is why it gets crushed.
a matter of mass
It depends on which conditions you are considering. If a tow truck stays then a force is the same for the car and truck. If it is moving forward or backward then the force which is effecting the truck is more because it has to spend some work to move. To understand this process I were you I would draw force diagram and check different conditions of movement.
I great small truck would be a Dodge Dakota. They are small but very durable, able to hall more like a bigger truck but they are a bit more compact but still enough room that you are not cramped.