Speeding up, slowing down and turning

Grade 8 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   A toy car starts from rest and goes faster and faster down a ramp. Is it accelerating, Ari?

   • No: it started at rest
   • No: a ramp does the moving, not the car
   • Yes: its speed is changing
2. 2.

   Bo rides a bike at a steady 5 m/s along a straight, flat path. Is the bike accelerating?

   • No: same speed, same direction
   • Yes: it is moving
   • Yes: 5 m/s is fast
3. 3.

   Esme's toy train goes around a circular track at a steady speed. Is the train accelerating?

   • Yes: its direction is changing
   • No: its speed stays the same
   • No: toy trains are too slow
4. 4.

   In Jun's diagram, the velocity arrow and the net-force arrow both point right. What is the cart doing?

   • Slowing down
   • Turning
   • Moving at a steady speed
   • Speeding up
5. 5.

   Now the cart's velocity arrow points right and its net-force arrow points left. What is the cart doing, Kira?

   • Moving left, the way the force points
   • Standing still
   • Slowing down
   • Speeding up, since a force acts
6. 6.

   In Luz's top view, the velocity arrow points right and the net-force arrow points toward the top of the page. What is the cart doing?

   • Slowing to a stop
   • Moving straight up the page
   • Speeding up, since a force acts
   • Turning
7. 7.

   Milo watches things in the gym. Which one is accelerating?

   • A cart rolling at a steady 2 m/s in a straight line
   • A mat lying on the floor
   • A book resting on the bleachers
   • A ball slowing as it rolls to a stop
8. 8.

   Noah lists four moving things. Which one has no acceleration?

   • A car going around a bend at a steady speed
   • A ball dropped from a desk
   • A bike braking at a red light
   • A puck sliding at a steady speed in a straight line
9. 9.

   Pia rides the Ferris wheel (snack in hand). Which of these is accelerating?

   • An escalator step going up a straight slope at steady speed
   • A parked bus by the gate
   • A Ferris wheel seat turning at a steady speed
   • An empty Ferris wheel stopped for the night
10. 10.

    A car slows from 20 m/s to 10 m/s on a straight road. Is it accelerating, Tala?

    • Yes: its velocity changed
    • No: it is still moving forward
    • Yes, but just at the end
    • No: speeding up is the one that counts