S2 revision

 $W\ =m\times g$  

A skydiver has a mass of 50 kg. Use the equation to calculate its weight.

• 5 kg

• 5 N

• 500 kg

• 500 N

What single force is acting on the skydiver in the exact moment she jumps off the plane?

• weight

• air resistance

• gravity

• upthrust

What force on the skydiver will significantly increase when she opens her parachute?

• weight

• air resistance

• gravity

• upthrust

Two forces of the same size and acting in opposite directions are said to be _____________________

A car is accelerating. This means the forces acting on it are _____________________

A car is moving at constant speed. Which of the following statement correctly describes the forces acting on the car?

• There are no forces acting on the car

• The forces on the car are balanced

• The forces on the car are unbalanced

What is the resultant force?

• 10 N to the left

• 10 N to the right

• 0 N

• 5 N to the left

What is the resultant force?

• 18 N to the right

• 18 N to the left

• 4 N to the right

• 4 N to the left

Choose the correct words to fill in the gaps:

As a diver goes deeper down, the pressure of _____________ on him ________________; this is because the deeper he goes the _______________ water there is above him.

• air; increases; more

• water; decreases; more

• water; increases; less

• water; increases; more

What is A in this diagram?

• reflected ray

• incident ray

• refracted ray

• incoming ray