Show:
Newtons Laws
Mass and Weight
Gravitation
Circular Motion
& Satellites
Miscellaneous
100
If the sum of all forces acting on a car is zero, then what two things may be true about the motion of the car?
What is it may be at rest or it may be moving at constant speed.
100
A 70-kg physics student approximately weighs this much on the surface of the Earth?
What is 700 Newtons?
100
A gravitational force of 300 N exists between two masses. If the distance between the masses is halved, what is the new force?
What is 1200N?
100
What is true about the motion of a car moving around a circular track at a constant speed of 40 mph?
What is it is accelerating?
100
Who calculated the value of G using a torsion balance?
What is Henry Cavendish?
200
Inertia depends only on this quantity.
What is mass?
200
A 85-kg astronaut weighs 833 N on Earth. What is his mass on the Moon, where g = 1.62 m/s^2?
What is 85-kg?
200
How do the value of G, the universal gravitation constant, and the value if little g, the acceleration due to gravity on a planet compare?
What is G is the constant 6.67 x 10^-11, whereas g is the acceleration due to gravity on a planet and is much larger.
200
What is the direction of the velocity vector of a satellite moving in orbit?
What is the velocity vector is tangent to the circle?
200
Did not Newton discover gravity? Explain.
What is "No, Newton did not discover gravity" but he formulated equations that made it universal.
300
A car hits a deer with a force of 3000N. What is the magnitude of the force that the deer exerts on the car?
What is 3000N?
300
A student throws a 7.5 N ball straight up. What is the net force on the ball at its maximum height?
What is 7.5 N, down.
300
What is the force of gravity between two 50-kg students sitting 1 meter apart?
What is 1.67 x 10^-7 N?
300
What is the direction of the acceleration vector of the Moon orbiting Earth?
What is the acceleration vector is directed inwards toward the center?
300
Does Einstein's theory of general relativity view gravity as a force? Explain.
What is "No. Einstein didn't believe in action-at-a-distance forces. He viewed gravity as the curvature of spacetime.
400
A 250-kg space craft is hurtling through space in a straight line at a constant speed of 850 m/s. What is the magnitude of the net force on the vehicle?
What is 0 N?
400
What are the two types of masses we discussed in class that Einstein said are equivalent?
What is rest mass and inertial mass?
400
What would happen to the value of little g and big G if Earth were twice as massive but remained the same size?
What is it little g would increase by a factor of 2 but big G would stay the same. g = GM/r^2
400
Does a satellite with a large or small orbit have the greater velocity? Explain using an equation.
What is smaller orbit, larger velocity. v = sqrt(GM/r)
400
What is the acronym for the large structures in Washington and Louisiana that search for gravitational waves?
What is LIGO.
500
The unit for force is a Newton. Re-express this derived unit in terms of the basic units.
What is kg/ms^2?
500
If a space shuttle goes higher into orbit, what happens to the satellite's period? Explain using equation.
What is the period increases. Period is proportional to r^(3/2)
500
What three constant do you need to know in order to calculate the orbital period of Jupiter?
What is mass of the Sun, distance from Sun to Jupiter, and universal gravitation constant?