midtermphysics
Terms
undefined, object
copy deck
- what are the units for mass?
- kg
- what are the units for distance?
- m
- what are the units for time?
- s
- what are the units for velocity?
- m/s
- what are the units for acceleration?
- m/s^2
- what are the units for force and weight?
- N
- what are the units for momentum?
- kg*m/s
- what are the units for energy?
- J
- Define scalar.
- magnitude
- Define vector.
- magnitude and direction
- Which of these has direction, a vector or scalar quantity?
- vector
- Which describes how far an object is from its starting point: distance or displacement?
- displacement
- What is the acceleration due to gravity?
- 10m/s
- Do larger objects accelerate faster than smaller objects when falling?
- no
- How would a vacuum affect acceleration of a falling object?
- cause no air friction
- What is inertia?
- mass
- An object at rest tends to__________________________ unless an outside force acts upon it.
- stay at rest
- An object in motion________________________________unless a ______________ acts upon it.
- stays in motion; outside force
- What is the difference between mass and weight?
- gravitational impact
- Newton’s Third Law of Motion: For every action there is an _______________ and opposite reaction.
- equal
- True of false: Forces always occur in pairs.
- True
- Which tends to keep an object from moving when a force is first applied to it? Static fiction or kinetic friction?
- Static friction
- Which tends to slow down an object while it is moving, static or kinetic friction?
- Kinetic friction
- Determine the net force acting on an object if the pushing force is 15N (west) and the friction force is 5 N (east).
- 10N
- As the masses of two objects increase, what happens to the force of gravity between them?
- increases
- As the distance between two objects increases what happens to the force of gravity between them?
- decreases
- When the distance between two objects doubles, what happens to the force of gravity between them?
- one-forth
- What is the law of conservation of momentum?
- Pbefore=Pafter
- 139 cm is equal to __________ m
- 1.39
- 475kg is equal to ________________g
- 475000
- Ryan takes a trip that covers 80 km and takes 4 hours. What is his average speed?
- 20km/h
- A motorcycle travels 3 hours at a speed of 900 km/h. What distance does it travel?
- 2700km
- How does positive acceleration differ from negative acceleration?
- dependant on direction
- If an object has zero acceleration what can you conclude about its velocity?
- it is zero
- Is your velocity constant if you travel at a constant 20 m/h on a curved road?
- no