Vocabulary
A push, pull or twist
Force
Define force
A push pull, or twist on an object
Force that pushes an object up
Upthrust
Forces are measured in (what unit)?
Newtons (N)
A force with an equal and opposite force acting on the same object is known as
Balanced force
A force exerted by a person, animal or machine
Applied force
All forces are caused by living things.
True or False?
False
A force that occurs when a springy object is squashed or stretched
Elastic force
The newton is named after
Sir Isaac Newton
Define contact force
Any force that can only occur when two objects are touching
A force that resists an object's motion through air
Air resistance
Give an example a push force.
Pushing the front door open
Define gravity
A force of attraction between all objects that have mass
Forces are measured using an instrument called a
Spring balance/spring scale/newton meter
Give an example of noncontact force
Gravity, magnetism, electrostatic
A force that resists an object's motion
Friction
What are three things force can do to an object?
Change its speed
Change its direction
Change its shape
Define magnetism
Magnetism is a non-contact force that can be either attractive or repulsive.
Three main parts of a spring scale:
Spring
Measurement scale
Hook
What is motion?
Motion is movement in any direction
The overall force on an object
Net force
A force acts when a tennis player hits a ball with a racquet. The effect of the force between the racquet and the tennis ball is to:
Stop the ball moving
Start the ball moving
Change the direction the ball is moving in
Change the direction the ball is moving in
Acts between two surfaces that are sliding, or trying to slide, across each other
Friction
Spring scales help us to find the force of ______ acting on an object
Gravity
What is an unbalanced force?
Forces acting on an object that cause the object to move