Force & Motion — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A ball rolls toward a wall. What will the wall most likely do?
A) speed the ball up
B) stop the ball or change its direction
C) make the ball heavier
D) turn the ball into a cube
The wall pushes the ball, stopping it or sending it back.
2. Which surface will let a toy car roll the farthest?
A) thick carpet
B) grassy lawn
C) smooth wood floor
D) sandy beach
Smooth wood has the least friction, so the car rolls farthest.
3. Why is it easier to push a heavy box up a ramp than lift it?
A) the box gets lighter
B) a ramp removes gravity
C) the ramp needs less force at one time
D) a ramp adds more friction
A ramp lets you use less force across a longer distance.
4. You push a toy car to the right. It hits a book and bounces left. What changed?
A) the car's color
B) the car's direction
C) the car's size
D) the car's shape
The push from the book changed the car's direction of motion.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A ramp makes moving heavy loads easier by spreading out the force needed.
A ramp reduces the force needed by spreading work over distance.
2. Wheels help loads move by replacing sliding with rolling.
Wheels roll instead of slide, which lowers friction on the load.
3. If a ball is rolling and nothing pushes or pulls it, friction will make it stop.
Friction slows the ball until it finally comes to rest.
4. A push from the side can change the direction a ball is moving.
A sideways push changes the ball's path and direction.
5. The steeper a slide is, the faster a kid will go down it.
Steeper slides let gravity pull harder along the slope, speeding the slide.