TOPIC 1.5 : FORCES

A hanging basket is fixed to a wall by a bracket. The weight of the basket is 80N and the weight of the bracket is 20N.

What is the size of the upward force exerted on the bracket by the wall?

• 60 N

• 70 N

• 90 N

• 100 N

A train of mass 240 000 kg is travelling at a speed of 60m/s. The brakes are applied and it decelerates for 10 minutes until it comes to rest.

What is the average resultant force?

• 24 000 N

• 40 000 N

• 480 000 N

• 720 000 N

What is the size of the resultant of the two forces shown in the diagram?

• 1.0 N

• 3.5 N

• 5.0 N

• 7.0 N

A man with an open parachute is falling to Earth at constant speed. The following forces are acting.

P: the upward force of the parachute on the man.

Q: the upward force of the man on the Earth.

R: the downward force of the Earth on the parachute.

S: the downward force of the man on the parachute.

Which two forces are a Newton’s third law pair?

• P and Q

• P and R

• P and S

• Q and R

The diagram represents the Moon in its orbit around the Earth.

Which arrow represents the direction of the resultant force acting on the Moon at the instant shown?

• A

• B

• C

• D