Yr7 P1.2 Squashing and stretching

What does a force do to an object when you hit or stretch it?

• It changes its temperature

• It deforms the object

• It increases the object's weight

What happens to a tennis ball when it hits the ground?

• Nothing – it stays the same shape

• It deforms – it squashes briefly

• It gets heavier

What is the name of the force that a chair or floor exerts on you?

• Pulling force

• Compression force

• Reaction force

What happens to the bonds between particles when you stand on the floor?

• They stretch permanently

• They break

• They compress and push back

What is the extension of a spring?

• The change in temperature of a spring

• The amount the spring stretches when a force is applied

• The length of the spring with no force on it

What does Hooke’s Law state?

• The heavier the object, the longer the spring

• Extension is proportional to the force applied

• Springs always return to their shape

According to the page, what shape is the force vs. extension graph if the spring obeys Hooke’s Law?

• Curved line

• Zigzag line

• Straight line

What happens when you stretch a spring beyond its elastic limit?

• It cools down

• It will not return to its original shape

• It gets shorter

What kind of forces compress the floor when you stand on it?

• Tension forces

• Contact forces

• Non-contact forces

What do we call the force that stretches a bungee cord?

• Compression

• Gravity

• Tension