One
A student lets go of a tennis ball. Which force falls it towards Earth.
Gravity
A toy car rolls across carpet and slows. Which force most directly opposes its motion where the wheels touch the carpet?
Friction
A magnet pulls a paper clip across a desk without touching it. Which force causes the clip to move?
Magnetism
A student pushes a box across the floor. The force exerted by the student on the box is an example of...
Applied Force
A book rests on a table. Which force does the table exert on the book?
Normal Force
Which pair lists forces that can act without direct contact between the objects?
Gravity & Magnetism
A skateboard rolls down a ramp. Which force pulls it downward along the ramp?
Gravity
A person rubs hands together and feels warmth. Which contact force is acting between the hands?
Friction
A child pulls a wagon handle is an example of....
Applied Force
A cup sits still on a counter. Gravity pulls it downward. Which force from the counter acts upward on the cup?
Normal Force
What does gravity accurately do?
It pulls objects toward one another.
A metal paper clip moves toward a magnet held nearby. What evidence shows that the force acts at a distance?
The clip moves before toughing the magnet.
A rolling ball crosses from a smooth tile floor onto a rough mat and slows more quickly. What explains the difference?
The mat produces more friction.
What two forces are both contact forces in a box being pushed across a floor?
Applied force & Friction
A student draws a box resting on a desk. Which pair of arrows correctly labels the forces acting vertically on the box?
Gravity down; normal force up