Force, Motion, and Energy Practice

Magnets repel each other when the same poles (north-north or south-south) are facing each other. This is due to the magnetic force that causes like poles to push away, resulting in the observed repulsion.

The correct choice is to push the car softly, then harder, and measure the distance. This directly tests how varying push strength affects the distance traveled, which aligns with the student's goal.

The girl is using mechanical energy to sweep the leaves. This type of energy involves the physical movement and effort applied to move objects, which is exactly what she is doing.

To move the box north, the students on the south side should push it. Their force will direct the box northward, while students on the north side would be pushing against the intended direction.

A person jumping uses mechanical energy as it involves the movement of the body. The other options involve electrical or thermal energy, not mechanical.

The best action is for one student to push forward while the other pulls forward. This coordinated effort maximizes force in the same direction, effectively moving the wagon forward, unlike the other options which oppose movement.

True. A car rolling down a ramp accelerates due to the force of gravity acting on it, pulling it downward and increasing its speed.

Thermal energy from the sun heats the water in the puddle, causing it to gain enough energy to change from liquid to vapor, which is the process of evaporation.

Releasing the car from different ramp heights allows for varying speeds, directly testing how speed affects the distance the block moves. This method effectively isolates the variable of speed, making it the best plan.

To demonstrate that a push changes a ball's motion, the student should roll the ball and measure how far it moves. This shows the effect of the push on the ball's motion, unlike the other options which do not involve motion.