In which scenario does gravity cause the change in the object's motion?
Answer(s): B
Gravity is the force that accelerates a skydiver towards the ground after they jump from a plane. In this scenario, gravity causes a significant change in the motion of the skydiver, pulling them downward and increasing their velocity until air resistance balances the force of gravity.
Integrated Physical Sciences, Chapter 3: Forces and Motion
Which force causes the velocity of a tossed coin to decrease when it sinks through the water in a wishing well?
As a coin sinks through the water in a wishing well, the velocity of the coin decreases due to the frictional force exerted by the water on the coin. This frictional force opposes the motion of the coin and slows it down.
In which scenario is gravity the force that causes the object's change in motion?
Answer(s): D
Gravity is the force responsible for the motion of a ball falling from a shelf to the floor. As the ball is released, gravity pulls it downward, causing it to accelerate towards the floor.
A truck is brought to a stop when its brakes are applied.What type of energy conversion takes place?
When a truck comes to a stop by applying the brakes, the kinetic energy of the moving truck is converted into thermal energy due to friction between the brake pads and the wheels. This conversion results in the production of heat, which dissipates the energy and brings the truck to a halt.
Integrated Physical Sciences, Chapter 5: Energy Transformations
A man holding a stick hits a ball directly upward with the stick.What type of energy conversion takes place from just after the ball leaves the stick to when it reaches its highest point?
Answer(s): A
When a man hits a ball directly upward with a stick, the kinetic energy imparted to the ball is converted into gravitational potential energy as the ball rises. As the ball reaches its highest point, its kinetic energy decreases to zero, and all of its energy is stored as gravitational potential energy.
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