Friction Quiz

What can you predict will happen when you jump on a sled on the side of a snow-covered hill?

• The sled will stay in place.

• The sled will slide down the hill.

• The sled will fly into the air.

• The sled will sink into the snow.

What can you predict about the sled's movement at the bottom of the hill?

• The sled will continue sliding at the same speed.

• The sled will climb up the opposite hill.

• The sled will slow down and stop.

• The sled will bounce back up the hill.

What causes the sled to accelerate down the hill?

• The force of friction

• Unbalanced forces

• The force of gravity

• Balanced forces

What eventually causes the sled to stop?

• The force of gravity

• The force of friction

• Balanced forces

• Unbalanced forces

What is friction?

• The smoothness experienced when sliding on ice

• The force that two surfaces exert on each other when they rub against each other

• The heat produced when two objects collide

• The resistance of air against a moving object

Which type of surfaces produce less friction?

• Rough surfaces

• Smooth surfaces

• Wet surfaces

• Uneven surfaces

What are the two factors that the strength of the force of friction depends on?

• The weight of the objects and the slope of the surface

• The temperature of the surfaces and the speed of movement

• How hard the surfaces push together and the types of surfaces involved

• The area of contact and the distance moved

Why would reindeer not be able to pull them easily over a rough surface such as sand?

• Because sand provides too much friction

• Because sand is too cold

• Because reindeer can only pull on snow

• Because the skis are not designed for sand

What happens to friction when surfaces push hard against each other?

• Friction decreases

• Friction remains the same

• Friction increases

• Friction is eliminated

When you rub your hands together forcefully, compared to rubbing them together lightly, the friction is:

• Less

• The same

• More

• Non-existent