Forces General Knowledge
What force pulls objects toward Earth?
Gravity
What happens to an object if an unbalanced force acts on it?
It changes its motion (it may start moving, stop, speed up, slow down, or change direction
What are the two poles of a magnet called?
North and South
Which simple machine is used to lift a bucket from a well?
A pulley
Which simple machine is a ramp an example of?
Incline plane
What is a force?
A push, pull or twist
What force helps a parachute slow down?
Air resistance
What happens when two north poles are pushed together?
They repel
What 2 simple machines make up a wheel barrow?
Lever and wheel & axle
Which scientist is famous for describing the laws of motion?
Isaac Newton
What force slows a moving object when two surfaces rub together?
Friction
A book is resting on a table. Name the two balanced forces acting on it.
Gravity pulling down and the support (normal) force pushing up.
Name one material that is attracted to a magnet.
Iron, nickel, cobalt, or steel.
Name the six simple machines.
Lever, wheel and axle, pulley, inclined plane, wedge, screw.
A student pushes equally hard from both sides of a box. What is the overall (net) force on the box?
Zero newtons because the forces are balanced.
What unit is used to measure force?
Newtons (N)
Why is it easier to push a shopping trolley with wheels than drag a heavy box?
Wheels reduce friction, making it easier to move.
What invisible area around a magnet allows it to attract objects?
The magnetic field.
Which simple machine can be found on a jar lid?
A screw
Name one contact force and one non-contact force.
Contact: friction, applied force, air resistance. Non-contact: gravity or magnetism.
A soccer ball is kicked. What force caused it to move?
An applied force
A student pushes a box with a force of 40 N to the right while another student pushes with 15 N to the left. What is the net force, and which way will the box move?
25 N to the right, so the box will move to the right.
A magnet is hidden inside a box. How could you work out where its poles are without opening the box?
Use another magnet or a compass to detect where the magnetic field is strongest and identify the poles.
Why do we use simple machines? (Need specific correct answer)
To make work easier by changing the size or direction of a force.
What is the difference between mass and weight?
Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.