3NT Chap 3.1 Forces

What is a force?

• pull only

• push only

• push and/or pull

Twisting a towel involves..

• pull forces only

• push forces only

• both push and pull forces

What is the SI unit for force?

• metres

• Newton

• seconds

• joules

Which of the following are possible effects of forces?

(Hint: There are four correct options!)

• Make a stationary object move

• Make a moving object stop

• Make a moving object move slower or faster

• Make an object change its mass

• Change the direction of a moving object

What is a net force?

• Two different forces acting on two objects.

• The sum of all forces acting on an object.

• The total number of energy in an object.

What is the net force?

• 50 N

• 450 N

• 500 N

• 950 N

Which pair will win the tug-o-war?

• Left (red & blue) group

• Right (grey & orange) group

In a game, Idris and Darwin is trying to pull Pumba. Both exerts 450 N of force but Pumba does not move.

Which of the following can be inferred from this game?

(Hint: There are two possible answers!)

• Pumba is exerting an opposing force of 900 N.

• Pumba is exerting an opposing force of less than 900 N.

• Pumba is exerting an opposing force of more than 900 N.

Convert 1km into m.

• 10 m

• 100 m

• 1 000 m

• 10 000 m

Convert 30 m into cm.

• 30 cm

• 300 cm

• 3 000 cm

• 30 000 cm