Speeding up, slowing down and turning

Grade 8 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   Ari's sled slides right across flat snow and slows down. Which pair of arrows fits the sled?

   • Velocity right, net force up the page
   • Velocity right, net force left
   • Velocity left, net force right
   • Velocity right, net force right
2. 2.

   A puck slides north on ice and curves to the west at a steady speed. Which pair of arrows fits the puck at the start of the curve, Bo?

   • Velocity west, net force north
   • Velocity north, no net force
   • Velocity north, net force north
   • Velocity north, net force west
3. 3.

   Esme's toy car circles a round track at a steady speed. At the top of the circle it moves right. Which pair of arrows fits it there?

   • Velocity right, no net force
   • Velocity right, net force down toward the center
   • Velocity right, net force right
   • Velocity right, net force up, away from the center
4. 4.

   The Moon circles Earth at about 1 km/s, its speed changing little. Is the Moon accelerating, Jun?

   • No: nothing pulls on it in space
   • Yes: its direction keeps changing
   • Yes: it is speeding up
   • No: its speed hardly changes
5. 5.

   A car drives once around a circular track at a steady 15 m/s and stops where it started. Did it accelerate while circling, Kira?

   • No: it ended where it began
   • No: its speed stayed 15 m/s
   • Yes, but just at the start
   • Yes, the whole time it turned
6. 6.

   Luz's bus slows down, turns a corner, then speeds up. During which parts is the bus accelerating?

   • While slowing and speeding up, not turning
   • None: a bus is too big
   • Only while speeding up
   • All three parts
7. 7.

   Milo says a car braking hard is not accelerating, because it is losing speed. Agree or disagree?

   • Agree: losing speed is the opposite
   • Disagree: it is speeding up
   • Agree: speeding up is the one that counts
   • Disagree: slowing down is acceleration
8. 8.

   Noah says a fast train cruising straight at 80 m/s has a huge acceleration. Agree or disagree?

   • Disagree: trains can't accelerate
   • Agree: a long train has more acceleration
   • Disagree: its velocity is not changing
   • Agree: faster means more acceleration
9. 9.

   Pia says a ball rolling at a steady speed around a curved track has zero acceleration. Agree or disagree?

   • Agree: the speed stays the same
   • Disagree: it is slowing down
   • Agree: curves don't count
   • Disagree: its direction changes
10. 10.

    Zee's distance-time line rises but bends flatter each second. What is the object doing?

    • Moving at a steady speed
    • Moving back toward the start
    • Speeding up: its distance still grows
    • Slowing down