Forces 1
A force that opposes motion?
Friction
What force is caused by gravity acting on a mass?
Weight
Magnetic, electrostatic and gravitational are non-contact forces. What separates the first two from the third?
They can attract and repel, gravitational only attracts.
F= ma - whose Second Law is this? (DOUBLE)
Newton
What force keeps the Earth in orbit?
Gravity
Mass is measured in ?
Weight is measured in ?
Work is measured in ?
Acceleration is measured in ?
kg
N
J
m/s2
Laundry in a clothes dryer often becomes charged with static electricity while drying. What force is best described in this situation?
Friction
What is the gravitational attraction between the Sun and each of the planets is responsible for?
A. The amount of sunlight reaching the planets.
B. The number of planets that can orbit the Sun.
C. The presence or absence of water on the planets.
D. The orbital motions of the planets around the Sun.
D
800J of work are done by a 50N force. What is the distance moved?
16m
Name the four contact forces?
Air Resistance
Normal
Applied
Friction
What is the difference between a Scientific Theory and a Scientific Law?
Scientific theories explain why and how nature follows specific scientific laws.
The gravitational pull of Saturn is greater than that of Mars. Which of the following best describes the mass and weight of an object on Saturn and Mars?
The mass of the object will be the same, but the weight will change on both planets.
The Law of Universal Gravitation states what?
The more massive and closer the objects are, the stronger the force of attraction is between them.
What is the similarities between Magnetic Force and Gravitational Force?
Both magnetic and gravitational forces are examples of non-contact forces that act at a distance.
Which of the following describes the relationship between the mass and weight of the water in the beaker on the left with the mass and weight of the beaker on the right?
Left Beaker has 150ml of water.
Right Beaker has 250ml of water.
Both the mass and weight of the water on the right is greater than the water on the left.
What are the possible electric charges on the unlabeled pith balls in the diagram?
_-___ _____ _-__ ___
Positive and Negative
What is the difference between Heliocentric and Geocentric models?
Location and motion
What is the definition of a Scientific LAW?
What will happen under certain conditions in the natural environment.
If you are pushing a box in front of you across the floor, what best describes the force of motion pushing back towards your feet?
A. It is a non-contact force that pulls the box down.
B. It is a contact force that opposes the box’s motion.
C. It is a contact force that adds to the object’s forward motion.
D. It is a non-contact force that attracts the box toward other objects.
B
Milton is riding a bike down a hill. As he gets to the bottom, he applies the brakes to stop the bike’s forward motion. Which of the following statements is an example of both the frictional force and the normal force acting on the bike?
The surface of the brake rubbing the rim of the front tire is an example of frictional force and Milton’s body pressing down on the seat of the bike is an example of normal force