Check your entry behaviour

When pulling a sled across the snow, what force helps it move forward?
Magnetic force.
Gravitational force.
Frictional force.
Tension force.
You push a heavy box across the floor with a certain force. What effect does your force have on the box?
It causes the box to accelerate.
It decreases the box's mass.
It changes the box's shape.
It increases the box's volume.
A person on roller skates continues moving forward even after stopping pushing. Which principle of Newton's first law does this illustrate?
Inertia
Conservation of momentum
Acceleration
Unknown
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