Gravitational Force
Gravity is a non contact force.
True or False
True, gravity is a force that does not need contact.
Friction is a contact force.
True or False
True, friction is a contact force.
Electrostatic force is a non-contact force that does not need to touch an object to move it.
True, electrostatic force is a non-contact force.
Magnetic force is a natural force (non- contact) force.
True or False
True, magnetic force is a non-contact force, it does not need to touch an object to move it. It is not controlled by a human.
A force is a push or a pull. A force can make an object start moving or stop moving.
True or False
True
Which item would reach the ground first if dropped from the same height?
A) bowling ball
B) balloon
C) paper
A) bowling ball, because heavy items have more gravitational force
Which option is the best example of high friction?
a) Sliding down a slide
b) Bike tires on a road
c) Walking in socks on a tile floor
d) Sledding down a snowy hill
b) Bike tires on a road
Static electricity causes lightning during thunderstorms.
True or False?
True
Peter uses a magnet to pull a paper clip towards him. Is this a natural force? Why?
Yes, magnetism is a natural force, because humans do not control the movement of the paper clip.
Myra slams the door behind her when she leaves her bedroom. Is this a contact or non-contact force? Why?
Contact, because Myra has to touch the door to make it move.
Similar charges such as + and + repel one another.
True or False?
True, similar charges repel.
How can I reduce (lower) the friction on a wood floor?
You can add water, oil or wax to the wood floor to make it slippery.
When objects rub against each other, their atoms become charged. One will be positive and one will be ?.
Negative
A gold ring is magnetic?
True or False?
False, only Nickel, Iron, Cobalt and Steel are magnetic.
N-Nickel
I-Iron
C-Cobalt
S-Steel
A landslide is a force in nature where a large amount of earth, rock, and mud move down from a steep slope.
What type of force is this?
Friction force changes from high to low and the soil/mud slips from high ground and then gravity forces the earth layer downward.
What is the definition of gravity?
Gravity is a force that pulls objects towards each other.
What is the definition of Friction?
Friction is a force that acts on objects that rub against each other.
What is the definition of electrostatic force?
Electrostatic force is the push or pull that happens with static-charged objects.
What is Magnetic force?
Magnetic force is the force of a magnet attracting objects made of iron, nickel, cobalt, and steel.
What is Force?
A force is a push or a pull. A force can make an object start moving or stop moving.
Which do you think has a stronger gravitational pull, the moon or the earth? Why?
The earth has a stronger gravitational pull than the moon because the earth has more mass.
How can I increase the friction of a slippery driveway?
Add salt or sand. Salt reduces the melting point of ice so ice melts faster.
Opposite charges + and - repel.
True or False?
False. Opposite charges attract!
What does repel mean?
Repel is when objects move away from each other.
Is pushing a cart a balanced or unbalanced force? Explain why?
Pushing a cart is an unbalanced force because the person is stronger than the cart which is why the cart moves.