True. If a net force acts on an object, the object's speed will change.
Explanation: This is in line with Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Since acceleration is the rate of change of velocity, a change in velocity (speed) will occur if a net force acts on the object.
True. An object's velocity will change if a net force acts on the object.
Explanation: Velocity is a vector quantity that includes both speed and direction. If a net force acts on an object, it can change the object's direction, resulting in a change in velocity.
True. If two objects have the same acceleration, they are under the influence of equal forces.
Explanation: According to Newton's second law, the acceleration of an object is directly proportional to the net force acting on it. If two objects have the same acceleration, it means that they are experiencing the same net force.
True. The net force acting on an object that remains at rest is zero.
Explanation: When an object is at rest, it means that its velocity is zero. According to Newton's first law of motion (the law of inertia), an object at rest tends to stay at rest unless acted upon by an external force. If the object remains at rest, it means that the net force acting on it is zero.
False. A truck initially moving at a constant velocity will not slow down unless a net force is applied.
Explanation: According to Newton's first law, an object in motion tends to stay in motion with the same velocity unless acted upon by an external force. If a truck is moving at a constant velocity, it means that the net force acting on it is zero. Therefore, it will not slow down unless a net force is applied.
False. During a collision between a car and a large truck, the car exerts the same force on the truck as the truck exerts on the car.
Explanation: According to Newton's third law of motion, for every action, there is an equal and opposite reaction. The forces exerted on each other by the car and the truck during the collision are equal in magnitude but opposite in direction. Therefore, the car exerts the same force on the truck as the truck exerts on the car.