Forces and Motion — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which surface pair has the highest friction in Grade 3 Science?
A) Rubber sneaker on pavement
B) Ice skate on ice
C) Sock on polished wood
D) Marble on glass
Grade 3 learners know rubber on pavement creates strong friction, making shoes grip well.
2. Which pair shows the LOWEST friction for Grade 3 learners?
A) Sneaker on carpet
B) Tire on gravel
C) Ice skate on ice
D) Chalk on sidewalk
Grade 3 Science shows ice on ice has very little friction, letting skaters glide smoothly.
3. What happens to a rolling ball on a rough carpet in Grade 3 experiments?
A) It speeds up forever
B) Friction slows it down
C) Gravity pushes it up
D) It floats away
Grade 3 Science teaches friction from rough surfaces slows down moving objects.
4. Why do car tires have deep grooves in Grade 3 Science lessons?
A) To look pretty
B) To reduce friction on dry roads
C) To increase friction and grip
D) To make the car lighter
Grade 3 learners know tire grooves increase friction so cars grip wet or rough roads safely.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Friction is a force that opposes motion between two surfaces.
Grade 3 Science defines friction as a force that resists the motion of objects rubbing together.
2. Rubber on pavement creates high friction in Grade 3 lessons.
Grade 3 students learn rubber and pavement produce large friction forces that stop sliding.
3. Ice on ice creates low friction, so skaters glide easily.
Grade 3 Science shows smooth icy surfaces have little friction, allowing smooth motion.
4. Sandpaper has a rough surface that increases friction.
Grade 3 learners know rough surfaces increase friction compared to smooth ones.
5. Without friction, it would be hard to start or stop walking.
Grade 3 Science teaches friction helps us start, stop, and change direction safely.