Sec 2NA Science Revision 1

Which of the following is DOES NOT involve contact force

• An apple falling from a tree on to the ground.

• A baby stretching a rubber band

• A rock climber gloves to grip the rocks when climbing.

• The tyres on a car moving forward on the road

When a planet exerts gravitational force on an object, the object has

• Weight

• Friction

• Elastic force

• Magnetic force

On National Day, the Red Lions parachuters depend on _________ to reach the ground safely.

• Gravity

• Strong wind

• Rain

• Geothermal energy

Newton is the SI unit for

• Only force

• Only weight

• Weight and force

• Mass

______ is the amount of matter in an object.

• Weight

• Force

• Mass

• Speed

The weight of an object

• is the same on earth and on the moon

• may change with location

• does not depend on gravity

• is less on earth than on the moon

A force applied can cause a turning effect about a fixed point called the

• Pivot

• Pressure

• Friction

• Convection

The heel of the stiletto causes more pain than the sole of a sports shoe because

• The stiletto heels has a very small area of contact and exerts high pressure

• The stiletto is very tight

• The area of contact of the sports shoe is very small, making it more comfortable

• The pressure exerted by the stiletto heel is lower

Pressure is

• Force divided by area

• Area divided by force

• Force minus area

• Force plus area

The dam wall of the reservoir is thicker at the bottom because

• Water pressure is higher at the base

• Water pressure is higher at the top

• The dam looks better this way

• Water may leak out from the bottom