Science WA3 Revision - FJX

Which of the following about forces are false?

• Its SI unit is Newtons (N)

• Forces are either contact-forces or non-contact forces

• Forces are either a push or pull

• Forces is unobservable but we can see its effects

Name 5 effects of forces.

One newton is the force that will cause a body of 1kg to change its speed by _ (Answer: 1_/_)

Which of the following is not a non-contact force?

• Gravitational force

• Electrostatic force

• Magnetic force

• Air resistance

Draw all forces acting upon the parachute.

Pressure can be calculated by which of the following formulae?

Explain why being stepped on by a woman's heels is more painful than being stepped on by a woman's sandals.