Forces [Part 1]

A tornado is a large column of air that spins at high speed. It is able to uproot trees and destroy buildings. What is the main form of energy that gives the tornado its destructive power?

• Heat energy

• light energy

• kinetic energy

• electrical energy

When a skydiver jumps from a plane and opens his parachute, he experiences an opposing force which immediately slows down his fall towards the ground. What are the contact and non-contact forces the skydiver experiences?

• A

• B

• C

• D

What is the SI unit of weight?

• Joule

• Pascal

• Newton

• kilogram

An astronaut travels from Earth to space, where less gravitational force is exerted on him. Which of the following correctly describes his mass and weight?

• A

• B

• C

• D

When a ball is thrown in the air and is hit by a bat, a series of event occurs. Which of the following does NOT occur?

• the ball stays in shape

• the ball becomes stationary

• the speed of the ball increases

• the ball moves in a different direction

Sally can jump to a height of 1m from the ground on Earth. Gravitational force on the moon is less than that on Earth. How high will Sally jump on the moon as compared to on Earth?

• 1m

• lower than 1m

• higher than 1m

• she will be unable to jump on the moon

Julie hits a nail onto the wall using a hammer. The force he applies is 9 N and the pressure exerted by the nail on the wall is 1 500 000 Pa. What will the pressure exerted on the wall be if Julien hits the nail a second time with a force of 12 N?

• 500 000 Pa

• 1 500 000 Pa

• 2 000 000 Pa

• 6 000 000

Which of the following shows a situation where high pressure is not useful?

• Using a scapel (knife) to cut through skin during surgery

• wearing high heeled shoes on soft gound

• wearing skis on snow

• using pins to attach a sign onto a noticeboard