Newton's Laws
The equation for newton's 2nd law.
What is F=m*a?
What values are needed to calculate speed?
What is distance and time
A freely falling object near Earth's surface has a constant acceleration of
9.8 m/s2
A college student has just bought a small computer that weighs 50 N. To reach her apartment on the 5th floor, which is 35 meters up, she must climb the stairs. How much work must she do to take her computer up the stairs?
what is 1750J
Work is measured in these units
Joules
An object's tendency to resist an unbalance force, which increases with mass.
What is inertia?
An object moves a distance of 10 meters in 5 seconds. What is the average speed of the object?
What is 2.0m/s
What will happen to the mass of a ball if it is moved from Earth to the Moon? (increase, constant, decrease)
mass will remain the same.
How much work does Juanita do if she uses a force of 40 newtons to pull 2 friends on a wagon for 32 meters?
1280 J
Acceleration is a change in this over time.
what is velocity
On the planet Gamma, a 4.0-kilogram mass experiences a gravitational force of 24 newtons. What is the acceleration due to gravity on planet Gamma?
What is 6.0
A swimmer starting from rest has a final velocity of 2.0 m/s after 20 seconds. What is her average acceleration?
0.1 m/s2
Scientists have sent an unmanned space vehicle to Mars to investigate the properties of the planet. Mars' gravitational field is 38% the strength of Earth's gravitational field. How will the weight and mass of the vehicle change on Mars?
mass remain the same
weight decrease
True or false: a simple machine increases the amount of work done by the machine and decreases the total amount of work done by the person.
false
velocity is a change in this over time
What change in an object would increase the force needed to move an object?
increasing the mass of an object
The velocity of a car changes uniformly from 60.0 meters per second north to 45 meters per second north in 5.0 seconds. What is the magnitude of the car's acceleration?
3.0 m/s2
If a rock and a feather are dropped in a 98-meter-long tube in which there is a vacuum, which one will hit the bottom first?
both
Darla pushed a cart with 50 newtons of force 100 meters away from her house. How much work, measured in joules (J), did she do to move the cart?
5000 J
A car accelerates from rest to a velocity of 60 m/s in 20 seconds. What is its acceleration.
3 m/s2
An object is moving at a constant speed. An additional force is applied to the object in the same direction as the object’s motion. What will happen to the forces of the object? What will happen to the speed?
What is unbalanced
What is increase
A bus is approaching a yellow light and uniformly slows from 13 m/s down to 3.4 m/s in a time span of 3.0 seconds. What is the rate of acceleration during this time?
what is -3.2 m/s2
F = m*a
Astronauts dropped five different objects from the same height on either Earth or the Moon. The table shows the data they collected.
Object Mass Gravitational Force
1 5 49
2 45 441
3 90 146
Which object was dropped on the moon?
what is object 3?
The pulley has a two ropes, and the load weighs 250 N.
A person pulls the rope of a pulley by 12 meters and lifts a load by 4 meters. How much work is done by the pulley?
The pulley has a two ropes, and the load weighs 250 N.
1000 N
What is the capital of the Phillipines?
A. Sydney
B. Manila
C. Nairobi
D. Seoul
What is Manila?