Forces, motion, pressure and moments

What units are forces measured in?

• Joules

• m/s

• Newtons

• kg

Which of these things can forces make objects do? Tick as many boxes as you think you need.

• Speed up or start moving

• Slow down or stop moving

• Change direction

• Turn

• Change shape

If the forces are balanced on an object that is stationary it will remain (a)   . Check your spelling.

Which forces act in the opposite direction to a moving object?

• Thrust

• Drag

• Lift

• Friction

Which type of drag causes the biggest resistance?

• Air resistance

• Water resistance

Tick all the true statements about forces.

• They are pushes or pulls

• They can always be seen

• The effects of them can be seen

• They always have a certain direction

• They usually act alone

A ma jumps out of a plane. What force pulls him to the centre of the Earth? Check your spelling.

(a)  

What do we call the sum of all forces acting on an object?

• Resultant force

• Total force

• Final force

• Biggest force

If the forces acting on an object are unbalanced, what could happen to its motion?

• Speed up

• Stay still

• Move at a constant speed

• Slow down

Brakes being applied to the wheel of a car are an example of what force? Check your spelling.

(a)