Forces
How do objects move?
A force
What type of force do we use when we OPEN a door?
pull
Which needs a stronger force:
A. pushing a toy car
B. Pushing a grocery cart
B. Pushing a grocery cart
True or False:
Friction helps speed objects up
False, friction slows objects down
What does a simple machine make easier?
Work, the amount of force needed to move an object.
What direction can forces come from?
up, down, left, right, or multiple directions
What type of force do we use when we CLOSE a door?
push
Which needs a weaker force:
A. painting with a brush
B. Throwing a baseball
A. painting with a brush
What direction do friction forces work if a ball is rolling down a ramp?
Against the ball, up the ramp.
What is a machine?
A. An object
B. A force
A. An object
It is an object used to make moving a different object easier.
push or pull
What direction of force is used to write with a pencil?
down
Which needs a stronger force:
A. lifting a 5-pound weight
B. lifting a 10-pound weight
B. lifting a 10-pound weight
If a surface is very bumpy does it have high or low friction?
High
What are 2 types of simple machines?
Wheel & Axel
Pulley
Screw
Inclined Plane
Lever
Wedge
What movement brings an object closer to you?
pull
What direction of force is used to lift up a box?
Up
Which needs MORE energy?
A. Moving a box across a flat floor
B. Moving a box down a ramp
A. Moving a box across a flat floor
Does an ice hockey rink or a paved road have HIGHER friction?
Paved road, it is less smooth.
What type of simple machine is a fishing rod?
Pulley
What movement moves an object further from you?
push
What direction of force is used in a tug-o-war?
Multiple directions!
Which needs LESS energy:
A. moving a box across a flat floor
B. moving a box UP a ramp
A. moving a box across a flat floor
If a book is being pushed to the left, what direction is the friction force pushing?
Right, pushing the opposite way as the object is moving.
What type of force does using a wheel DECREASE?
Friction