Acceleration is _______________.(1 point) Responses An object’s speed in a specific direction An object’s speed in a specific direction An object’s direction’s rate of change An object’s direction’s rate of change An object’s speed when its motion is constant An object’s speed when its motion is constant An object’s velocity is rate of change An object’s velocity
Acceleration is an object's direction's rate of change.
Acceleration is defined as the rate of change of velocity with respect to time. In other words, it is how quickly an object's velocity changes over time.
What do unbalanced forces do?(1 point) Responses Unbalanced forces cannot change an object’s direction. Unbalanced forces cannot change an object’s direction. Unbalanced forces can make an object move in the opposite direction of the force that is applied. Unbalanced forces can make an object move in the opposite direction of the force that is applied. Unbalanced forces cause an object’s motion to change. Unbalanced forces cause an object’s motion to change. Unbalanced forces allow an object’s motion to stay the same.
Unbalanced forces cause an object's motion to change.
In a boat race, the boats all sail the same distance. In addition to the distance covered, what information is necessary to calculate the winner?(1 point) Responses The wind’s speed The wind’s speed The time each boat takes to get to the finish line The time each boat takes to get to the finish line Each boat’s size Each boat’s size The skill of each boat’s crew
The time each boat takes to get to the finish line.
Which choice represents velocity?(1 point) Responses 35 m/s 35 m/s 15 km/hr west 15 km/hr west 4 g/mL 4 g/mL 12 m/s2
15 km/hr west
The graph below shows a cyclist’s velocity over a period of time. Describe the cyclist’s acceleration. (1 point) Responses The acceleration of the cyclist is constant and non-zero The acceleration of the cyclist is constant and non-zero The acceleration of the cyclist is constant and zero The acceleration of the cyclist is constant and zero The acceleration of the cyclist is going up The acceleration of the cyclist is going up The acceleration of cyclist is going down
Based on the graph, the cyclist's acceleration is constant and non-zero.
A plane is flying at a speed of 70 kilometers per hour. Then a tailwind (moving in the same direction as the plane) of 5 kilometers per hour acts on the plane. How is the plane’s net force calculated?(1 point) Responses Multiply the two forces Multiply the two forces Subtract the smaller force from the greater one Subtract the smaller force from the greater one Divide the larger force by the smaller force Divide the larger force by the smaller force Add the two forces together
The plane's net force is calculated by adding the two forces together.
A student is investigating mass and acceleration. The student applies the same force of 40 N force to two boxes that have the same size and shape. Box 1 experiences an acceleration of 10 m/s^2 and box 2 experiences an acceleration of 5m/s^2. The student claims that box 1 must have a smaller mass than box 2. Which argument best supports the student's claim?(1 point) Responses Heavier objects need greater force than lighter objects to accelerate at the same rate. Heavier objects need greater force than lighter objects to accelerate at the same rate. Heavier objects need less force than lighter objects to accelerate at the same rate. Heavier objects need less force than lighter objects to accelerate at the same rate. Lighter objects need less force than heavier objects to start moving but will accelerate at the same rate. Lighter objects need less force than heavier objects to start moving but will accelerate at the same rate. Lighter objects need greater force than heavier objects to start moving but will accelerate at the same rate.
Heavier objects need greater force than lighter objects to accelerate at the same rate.
Two forces act on an object. One force has a magnitude of 30N directed west, and the other force has a magnitude of 12 N directed east. What is the net force on the object?(1 point) Responses 18N west 18N west 18N east 18N east 42 N east
The net force on the object is 18 N west.
What type of forces does this box experience and in which direction does it move? (1 point) Responses Balanced forces and it moves to the left Balanced forces and it moves to the left Unbalanced forces and it moves to the right Unbalanced forces and it moves to the right Unbalanced forces and it moves to the left Unbalanced forces and it moves to the left Balanced forces and it doesn't move it is 14 N on the left and 8 N on the right
The box experiences unbalanced forces and it moves to the left.
A book is resting on a table in a state of equilibrium. Which statement is true about the forces acting on the book? (1 point) Responses The book experiences unbalanced forces because the force of gravity pulling down on the book and the force of the table pushing up are equal. The book experiences unbalanced forces because the force of gravity pulling down on the book and the force of the table pushing up are equal. The force of gravity pulling down the book and the force of the table pushing up on the book are equal. The force of gravity pulling down the book and the force of the table pushing up on the book are equal. The book experiences balanced forces because the force of gravity pushing down on the book is greater. The book experiences balanced forces because the force of gravity pushing down on the book is greater. The book experiences unbalanced forces from friction, gravity and the table.
The statement "The force of gravity pulling down the book and the force of the table pushing up on the book are equal" is true about the forces acting on the book.
