Forces - Check Lesson

What forces cause a sled to move?

• Pushing or pulling forces

• Gravity and air resistance

• Friction and air resistance

How does gravity affect the motion of a sled?

• It pulls the sled downward, increasing its speed on a slope.

• It resists motion, slowing the sled down.

• It has no effect on the sled's motion.

• It pushes the sled forward on flat ground.

How does friction affect the motion of a sled?

• It increases the sled’s speed.

• It resists motion, slowing the sled down.

• It pulls the sled downward.

• It has no effect on the sled's motion.

How is a skateboard moving down a ramp similar to and different from a sled?

• Both use wheels to move, but the sled needs more force to start moving.

• Both move down because of gravity, but the skateboard uses wheels, and the sled slides.

• Both use friction to speed up, but the skateboard moves faster than the sled.

• Both need someone to push them, but only the sled moves without wheels.

What force makes water in a fountain come back down?

• Friction

• Gravity

• Change in speed

• Change in direction

What force is responsible for stopping a bicycle when brakes are applied?

• Gravity

• Change in direction

• Friction

• Change in speed

What happens to water in a fountain when it goes up and comes back down?

• Change in speed

• Change in direction

What happens to a bicycle when the brakes are used?

• Change in speed

• Change in direction

You perform an experiment to see how long it takes a box to slide down three different surfaces. Based on the data in the table above, which surface has the most friction?

• Surface A because it took the most time to slide down

• Surface B because it took the least amount of time to slide down

• Surface C because it took just the right amount of time to slide down.

• They are all the same.

This box is not moving. Predict the motion of the box if two more students push with this student.

• The box will move down the hill.

• The box will continue to not move.

• The box will move up the hill.

• The box will move sideways.