Speeding up, slowing down and turning

Grade 8 Science Worksheet

Circle the best answer.

1. 1.

   A ball rises straight up after a toss. In Ari's side-view diagram, its velocity arrow points up and its net-force arrow (gravity) points down. What is the ball doing?

   • Moving down, the way the force points
   • Slowing down as it rises
   • Rising at a steady speed
   • Speeding up, since gravity acts
2. 2.

   Force arrow diagram (top view). A puck slides right on ice, tied by a string to a post at the top of the page. The net force points toward the post. What is the puck doing, Esme?

   • Moving straight to the post
   • Speeding up, since the string pulls
   • Turning toward the post
   • Stopping at once

3. Read this first

   Table (example data)

   Time (s) and velocity. 0 s, 10 m/s north; 1 s, 8 m/s north; 2 s, 6 m/s north; 3 s, 4 m/s north.

4. 3.

   Kira records a bike's velocity on a straight road. Is the bike accelerating?

   • No: speeding up is what counts
   • Yes: it is slowing down
   • Yes: it is turning
   • No: it keeps going north

5. Table (example data)

   Time (s) and velocity. 0 s, 3 m/s east; 2 s, 3 m/s south; 4 s, 3 m/s west; 6 s, 3 m/s north.

6. 4.

   Luz's robot drives a square path at one speed. Is the robot accelerating?

   • Yes: its direction changes
   • No: its speed stays 3 m/s
   • Yes: it speeds up
   • No: it ends heading north
7. 5.

   Milo learns that a car has a gas pedal, a brake and a steering wheel. Which of them can make the car accelerate?

   • All three of them
   • The steering wheel alone
   • The gas pedal and the brake, not the wheel
   • The gas pedal alone
8. 6.

   On a bike, Noah can pedal harder, squeeze the brakes or turn the handlebars. Which actions make the bike accelerate?

   • Turning the handlebars alone
   • Pedaling harder alone
   • Pedaling and braking, not turning
   • All three of the actions
9. 7.

   Pia pushes a scooter faster, drags a foot to slow it, then leans into a turn. During which actions is the scooter accelerating?

   • Pushing and slowing, not turning
   • Pushing faster alone
   • None of them
   • All three of the actions
10. 8.

    Car A cruises at a steady 30 m/s on a straight road. Car B speeds up from 0 to 10 m/s. Which car is accelerating, Ren?

    • Car B
    • Both, as both are moving
    • Car A, as it is faster
    • Neither
11. 9.

    A plane cruises at a steady 250 m/s in a straight line. A bus pulls away from a stop. Which is accelerating, Tala?

    • The plane, as it is much faster
    • Neither
    • Both, as both are moving
    • The bus
12. 10.

    Zee sees a parked bike, a bus at a steady 15 m/s on a straight road and a car on a roundabout at a steady 8 m/s. Which is accelerating?

    • No object, as no speed changes
    • The bus, as it is fastest
    • The car on the roundabout
    • The parked bike